Hollow-core Residential Design Manual - EnCon · PDF file3 Introduction This EnCon Hollow-core...

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Providing Engineered Concrete Solutions

C O L O R A D O

G E O R G I A

O R E G O N

U T A H

W A S H I N G T O N


Hollow-core Single Family Residential System Design Manual

Copyright © 2013 By EnCon Design, LLC

HCM002 3.23.2015

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Introduction

This EnCon Hollow-core Residential Design Manual has

been designed to illustrate the many ways in which hollow-

core precast concrete can function as a multi-purpose

building system or as an integral component of a building

system. Owners, contractors, architects, and engineers will

discover that hollow-core building systems can be used in

a wide variety of settings and offer a myriad of benefits.

Hollow-core systems are cost effective, allow construction

to remain on budget and on schedule, require less

maintenance, and create less environmental impact than

conventional building materials.

A hollow-core structure is fire resistant, moisture resistant,

allows less sound transmission, offers flexible floor plans,

and meets unique building needs and challenges. Hollow-

core precast concrete helps manage heating and cooling

demands, resulting in reduced energy costs. The safety,

security, and high fire resistance it offers keep insurance

rates low as well. Structurally, a hollow-core system

provides high load capacity for floors, open clear spans,

high vibration resistance, finished ceilings and floors,

reduced floor-to-floor height, and natural space for

electrical conduit, plumbing, and HVAC ductwork.

This manual includes sections addressing Frequently Asked

Questions and technical data, as well as product cross

section details and connection concepts. Also enclosed are

sample specifications and a set of typical general notes.

No matter what the type of design, EnCon’s hollow-core

precast concrete building systems provide homeowners,

designers, and contractors with benefits that are

unsurpassed. For further information or to discuss a

project, please see the Contact List on the back cover.

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Table of Contents Introduction ................................................................................................................................................................................................ 3 Table of Contents........................................................................................................................................................................................ 4 Product System Uses .................................................................................................................................................................................. 5

Single Family Residential ........................................................................................................................................................................ 5 Advantages of an EnCon Precast Hollow-core Residential Floor System ............................................................................................... 6

Typical Design and Delivery Process ........................................................................................................................................................... 7 Frequently Asked Questions ....................................................................................................................................................................... 8

What is hollow-core? ............................................................................................................................................................................. 8 How is hollow-core produced? .............................................................................................................................................................. 8 What are the opening limitations in a hollow-core system? ................................................................................................................. 9 What sizes of hollow-core slab are available? ....................................................................................................................................... 9 What types of bearing systems are used with a hollow-core system? .................................................................................................. 9 Span-Depth Ratios ............................................................................................................................................................................... 10 Typical Design Loads ............................................................................................................................................................................ 10 Minimum Bearing ................................................................................................................................................................................ 10

Load Tables .............................................................................................................................................................................................. 10 4HC - 4’-0” Untopped Hollow-core Sections ........................................................................................................................................ 12 4HC-Top - 4’-0” Topped Hollow-core Sections ..................................................................................................................................... 13 8HC - 8’-0” Untopped Hollow-core sections. ....................................................................................................................................... 14 8HC-Top - 8’-0” Topped Hollow-Core Sections. ................................................................................................................................... 15

Detail Design ............................................................................................................................................................................................. 16 Cross Section Details ............................................................................................................................................................................ 16 Section Properties ................................................................................................................................................................................ 17 Fire Rating or Resistance ...................................................................................................................................................................... 17

Common Details ....................................................................................................................................................................................... 17 Hollow-core to Masonry – Load Bearing with Topping ........................................................................................................................ 18 Hollow-core to Masonry Non-Load Bearing ......................................................................................................................................... 19 Hollow-core to Precast or Cast-in-Place – Non-Load bearing .............................................................................................................. 20 Hollow-core to Steel Wide Flange Alternate ........................................................................................................................................ 21

Project Specifications (Sample) ................................................................................................................................................................ 22 General Notes (Sample) ............................................................................................................................................................................ 24 Contact List: .............................................................................................................................................................................................. 27

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Product System Uses

Single Family Residential EnCon’s precast concrete hollow-core offers many benefits at a cost-effective price. Often, the space beneath a garage can be exploited by extending the basement walls to include the garage overhead. Setting hollow-core slabs on bearing walls forms the necessary fire separation and the perfect noise barrier. The slab serves as a ceiling for the lower level and creates a column-free area that can be used for storage or as functional living space. Hollow-core provides superior moisture control and protection from mold development and water-related damage.

Floor and Roof Systems Complex geometry and floor plans are easily designed using a precast hollow-core system. Layouts can be adjusted to accommodate inconsistent or repetitive bearing geometries. Optimal use of the material can be achieved and minimal in-place forming requirements are primary benefits of a hollow-core system.

Product System Benefits

Precast hollow-core provides a cost-effective efficient floor and roof system. The slabs facilitate the completion of a building in the least amount of time possible, at the most economical cost, without sacrificing quality or the integrity of the structure.

Custom Home Roof and Floor Plans

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Advantages of an EnCon Precast Hollow-core Residential Floor System

EnCon’s commitment to partnership, customer care, and product excellence. EnCon maintains a full service integrated approach to delivery, from design support to product installation. Clients receive the benefits and convenience of a single source EnCon’s commitment to partnership, customer care, and product excellence. EnCon maintains a full service integrated approach to delivery, from design support to product installation. Clients receive the benefits and convenience of a single source supplier, which limits the project risk and the number of subcontracts needed. The EnCon Companies have delivered high quality precast concrete structures throughout the United States.

A hollow-core system can be used as a lateral load diaphragm.

Long spans with shallow sections allow for high span-to-depth ratios while reducing floor-to-floor heights. This results in more interior space with less obstruction from structural depth and columns.

Design flexibility. Spaces without interior support columns can accommodate nearly any floor plan as well as enable the rendering of unusual or complicated details.

Increased load capacity for floors.

Greater quality control, consistency and finish with in-plant production. Plant production will also reduce on-site labor and lower the job site safety risk.

The rapid construction process enables openings in the floor plate to be closed quickly, creating an immediate working platform for other trades concurrently working onsite. EnCon’s precast components and systems can be erected in adverse weather conditions where other building systems may not.

Long-term durability, requiring far less maintenance than conventional building materials.

Excellent fire resistance and protection as well as vibration resistance. Moisture control, mold and mildew resistance, and insect proof. Acoustical control; reduced noise transmission between spaces for greater privacy.

Hollow-core can provide natural channels for wiring conduit, heating, air conditioning, and plumbing.

Offers finished ceilings that may be left exposed or painted. A delivered finished system eliminates need for suspended ceilings.

Offers finished floors; with minimal leveling and finishing, the final surface may be directly applied.

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Typical Design and Delivery Process

The flow chart below highlights the general process from project initiation to completion. The tables contain representative project schedules and demonstrate the primary scheduling benefit of precast concrete construction. There are a number of interrelated yet overlapping activities that allow faster turnaround and quicker job completion.

Preliminary Design

Assistance

Project Identification

Estimate and Award Project

Final Design Calculations,

Erection Drawings, and Details

Manufacture, Store,

and Transport

Final Erection and Production

Drawings

Erection and

Field Finish

Project Completion

Approval

lll

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Frequently Asked Questions

What is hollow-core? Hollow-core is a prestressed concrete flat slab containing continuous hollow voids that run throughout its length. It is lighter in weight and lower in cost than conventional cast-in-place concrete. The two most popular applications for hollow-core are floor and roof deck systems. What is prestressed concrete? Reinforced concrete members must carry their own weight as well as any applied loads. Prestressing adds an internal force that counteracts the self-weight and the loads that are applied. What is camber? Camber is a byproduct of an eccentric prestress force. Since the most economical placement of strand is at the bottom of the member, the prestress is below the center of gravity thus causing the center of the member’s span to bow up. The amount of camber is affected by a number of factors including span, prestressing force, concrete strength, and curing variations. What is the finished surface of a hollow-core system? If the final surface is un-topped, a leveling compound can be used for finishing the joints and any unevenness between the slabs. If the top will be layered with a concrete topping, no additional surface preparation is required.

How is hollow-core produced? EnCon produces hollow-core through a dry cast extrusion or a slip form process. Prestress strand, the primary reinforcement, is installed and stretched prior to adding any concrete. Afterwards, the concrete can be placed with a mechanical slip or through extrusion

Pulling Strand Extrusion Saw Cutting Storage

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What are the opening limitations in a hollow-core system? Openings smaller than 12”x12” are generally installed in the field through a core drill process. Hammer drilled holes smaller than 2½” in diameter can be installed in nearly any location within the system. Openings larger than 12” are added to the product in the plant and must follow the engineering and design requirements of the system.

What sizes of hollow-core slab are available? 4 foot width with thicknesses of 8, 10 and 12 inches, and 8 foot width with thicknesses of 8, 10 and 12 inches. All Hollow Core planks can be ribbed to fit your exact project requirements.

What types of bearing systems are used with a hollow-core system? Hollow-core is a very versatile building system. Support can be provided by other precast sections (beams, walls, etc.,) steel sections, cast-in-place, and masonry. Connections are independent of the bearing system.

Plant Cut Penetration Flexibility Core Drill Header Steel

Masonry Steel Frame Cast-in-Place Precast Frame

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Preliminary Design

Span-Depth Ratios A span-depth ratio of 45 is common for floors and roofs where fire endurance, openings, or heavy or sustained live loads do not control a design. The design recommendations for span lengths vary slightly from cross section to cross section, but the following are general rules to consider in the preliminary design. Assuming a uniform superimposed load of 40 pounds per square foot and an un-topped system, these guidelines apply: Factors such as concentrated loads and large openings can affect the span capabilities of a system. Once the given loadings, fire endurance ratings, span lengths, and slab thicknesses have been determined, load tables are consulted.

Typical Design Loads Design loads are determined by applicable building codes, engineering judgment, and building use. The following guidelines may be used:

Building Use Dead Load (psf) Live Load (psf)

Residential floors 10 - 15 40 - 50

Residential garage floors 10 - 15 80

Minimum Bearing Hollow-core units require a minimum of 2” of bearing. They are typically designed and detailed with a ⅛”-thick continuous bearing material. For steel, bearing of 2” is recommended and for concrete surfaces, 3” is recommended.

Depth Span

8 inches 39 feet

10 inches 42 feet

12 Inches 46 feet

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Load Tables The following load tables are based on both topped (composite) and un-topped systems. Load spans are

approximate and based on ACI 318-05. The values are assumed to be service level live loads without the 1.6

multiplier.

When the analysis of the section includes topping, the following topping parameters are used. 2” Composite

thickness mid-span, an additional 25 psf dead load, and a 28-Day topping strength of 4000 psi.

Product Code Description

Load Table Key

Controlled by ductility requirements

4HC

Section product code (HC-Hollow-core)

Section width in feet

Quantity of ½” Diameter Strand

Section Depth

8-4 Controlled by ductility requirements

8-4 Controlled by shear

8-4 Controlled by flexureControlled by flexure Strand fpu = 270.0 ksi f'ci = 3500 psi f'c = 7000 psi Effective Pull Ratio = 0.75fpu

Controlled by shear

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4HC - 4’-0” Untopped Hollow-core Sections

12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

30 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4

40 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4

50 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4

60 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4

70 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6

80 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6

90 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6

100 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6

110 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-6

120 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-6 8-7

130 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 8-7

140 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 8-7 10-6

150 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-6 8-7 10-6 10-6

160 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 10-6 10-6 10-6

170 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 10-6 10-6 10-6 10-6 12-6

180 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 10-6 12-6 12-6

190 8-4 8-6 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 10-6 10-6 10-6 12-6 12-6

200 8-4 8-6 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 10-6 12-6 12-6 12-6

210 8-4 8-6 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 10-6 10-6 12-6 12-6 12-6 12-6

220 8-4 8-6 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 10-6 10-6 10-6 12-6 12-6 12-6

230 8-6 8-6 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 10-6 10-6 10-6 12-6 12-6 12-6 12-6

240 8-6 8-6 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 10-6 12-6 12-6 12-6

250 8-6 8-6 8-4 8-4 8-4 8-6 8-6 8-6 8-6 10-6 10-6 10-6 12-6 12-6 12-6 12-6

260 8-6 8-6 8-4 8-4 8-4 8-6 8-6 8-6 10-6 10-6 10-6 12-6 12-6 12-6 12-6

270 8-6 8-6 8-4 8-4 8-4 8-6 8-6 8-7 10-6 10-6 10-6 12-6 12-6 12-6 12-6

280 8-6 8-6 8-4 8-4 8-6 8-6 8-6 10-4 10-6 10-6 12-6 12-6 12-6 12-6 12-6

290 8-6 8-6 8-4 8-4 8-6 8-6 8-7 10-6 10-6 12-6 12-6 12-6 12-6

300 8-6 8-6 8-4 8-4 8-6 8-7 10-6 10-6 10-6 12-6 12-6 12-6 12-6

310 8-6 8-6 8-4 8-6 8-6 10-4 10-6 10-6 12-6 12-6 12-6

320 8-6 8-6 8-4 8-6 8-6 10-4 10-6 10-6 12-6 12-6 12-6

330 8-6 8-6 8-4 8-6 8-7 10-4 10-6 12-6 12-6 12-6

340 8-6 8-6 8-4 8-6 10-4 10-6 10-6 12-6 12-6

350 8-6 8-6 8-4 8-6 10-4 10-6 12-6 12-6

360 8-6 8-6 8-6 8-7 10-4 10-6 12-6

370 8-6 8-6 8-6 10-6 10-6 12-6

380 8-6 8-6 8-6 10-6

390 8-6 8-6 8-7 10-6

400 8-6 8-6 10-6

410 8-6 8-6

420 8-6 8-6

430 8-6 8-7

440 8-6

Live Load

(psf)

4HC - UntoppedSIMPLE SPAN IN FEET - CENTER TO CENTER OF END BEARINGS (ft)

30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

30 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 10-6 12-6 12-6 12-6 12-6

40 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-6 8-6 8-7 10-6 10-6 10-6 12-6 12-6 12-6 12-6

50 8-4 8-4 8-6 8-6 8-6 8-6 8-6 8-6 8-6 8-7 10-6 10-6 12-6 12-6 12-6

60 8-4 8-6 8-6 8-6 8-6 8-6 8-6 8-7 8-7 10-6 10-6 12-6 12-6 12-6

70 8-6 8-6 8-6 8-6 8-6 8-7 8-7 8-7 10-6 12-6 12-6 12-6 12-6

80 8-6 8-6 8-6 8-6 8-7 8-7 10-6 10-6 12-6 12-6 12-6

90 8-6 8-6 8-7 8-7 8-7 10-6 10-6 12-6 12-6 12-6

100 8-6 8-7 8-7 10-6 10-6 12-6 12-6 12-6 12-6

110 8-7 8-7 10-6 10-6 12-6 12-6 12-6 12-6

120 8-7 10-6 10-6 12-6 12-6 12-6

130 10-6 10-6 12-6 12-6 12-6

140 10-6 12-6 12-6 12-6 12-6

150 10-6 12-6 12-6 12-6

160 12-6 12-6 12-6

170 12-6 12-6

180 12-6 12-6

190 12-6

200

4HC - UntoppedSIMPLE SPAN IN FEET - CENTER TO CENTER OF END BEARINGS (ft)Live Load

(psf)

13

4HC-Top - 4’-0” Topped Hollow-core Sections

12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

30 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4

40 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4

50 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4

60 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4

70 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4

80 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4

90 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6

100 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6

110 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6

120 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6

130 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6

140 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-6

150 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7

160 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 10-6

170 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 8-7 10-6

180 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 10-6 10-6

190 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 10-6

200 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 10-6 10-6 12-6

210 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 10-6 12-6

220 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 10-6 10-6 12-6 12-6

230 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 12-6 12-6 12-6

240 8-4 8-6 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 8-7 10-6 10-6 12-6 12-6 12-6

250 8-4 8-6 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 12-6 12-6 12-6

260 8-4 8-6 8-4 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 12-6 12-6 12-6

270 8-4 8-6 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 10-6 12-6 12-6

280 8-4 8-6 8-4 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-7 10-6 10-6 12-6 12-6 12-6

290 8-6 8-6 8-4 8-4 8-4 8-4 8-6 8-6 8-6 8-6 10-6 10-6 10-6 12-6 12-6 12-6

300 8-6 8-6 8-4 8-4 8-4 8-4 8-6 8-6 8-6 10-6 10-6 10-6 12-6 12-6 12-6

310 8-6 8-6 8-4 8-4 8-4 8-4 8-6 8-6 10-6 10-6 10-6 12-6 12-6 12-6 12-6

320 8-6 8-6 8-4 8-4 8-4 8-4 8-6 8-6 10-6 10-6 10-6 12-6 12-6 12-6 12-6

330 8-6 8-6 8-4 8-4 8-4 8-6 8-6 8-6 10-6 10-6 12-6 12-6 12-6 12-6

340 8-6 8-6 8-4 8-4 8-4 8-6 8-6 10-4 10-6 10-6 12-6 12-6 12-6 12-6

350 8-6 8-6 8-4 8-4 8-4 8-6 8-6 10-6 10-6 12-6 12-6 12-6 12-6

360 8-6 8-6 8-4 8-4 8-6 8-6 8-7 10-6 10-6 12-6 12-6 12-6

370 8-6 8-6 8-4 8-4 8-6 8-6 10-6 10-6 12-6 12-6 12-6

380 8-6 8-6 8-4 8-4 8-6 8-6 10-6 10-6 12-6 12-6

390 8-6 8-6 8-4 8-4 8-6 10-4 10-6 10-6 12-6 12-6

400 8-6 8-6 8-4 8-4 8-6 10-4 10-6 12-6

410 8-6 8-6 8-4 8-6 8-6 10-6 10-6 12-6

420 8-6 8-6 8-4 8-6 10-4 10-6

430 8-6 8-6 8-4 8-6 10-4 10-6

440 8-6 8-6 8-4 8-6 10-4 10-6

Live Load

(psf)

SIMPLE SPAN IN FEET - CENTER TO CENTER OF END BEARINGS (ft)

4HC - Topped

30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

30 8-4 8-4 8-6 8-6 8-7 10-6 10-6 10-6 10-6 10-6 12-6 12-6 12-6 12-6 12-6

40 8-4 8-4 8-6 8-6 8-7 10-6 10-6 10-6 10-6 10-6 12-6 12-6 12-6 12-6 12-6

50 8-4 8-4 8-6 8-6 8-7 10-6 10-6 10-6 10-6 10-6 12-6 12-6 12-6 12-6 12-6

60 8-4 8-4 8-6 8-6 8-7 10-6 10-6 10-6 10-6 10-6 12-6 12-6 12-6 12-6 12-6

70 8-4 8-6 8-6 8-6 8-7 10-6 10-6 10-6 10-6 10-6 12-6 12-6 12-6 12-6

80 8-6 8-6 8-6 8-6 8-7 10-6 10-6 10-6 10-6 12-6 12-6 12-6

90 8-6 8-6 8-6 8-6 8-7 10-6 10-6 10-6 12-6 12-6 12-6

100 8-6 8-6 8-6 8-6 8-7 10-6 10-6 12-6 12-6 12-6

110 8-6 8-6 8-6 8-7 8-7 10-6 12-6 12-6 12-6

120 8-6 8-6 8-7 8-7 10-6 12-6 12-6 12-6

130 8-6 8-7 10-6 10-6 12-6 12-6 12-6

140 8-7 10-6 10-6 12-6 12-6 12-6

150 10-6 10-6 10-6 12-6 12-6

160 10-6 10-6 12-6 12-6

170 10-6 12-6 12-6 12-6

180 12-6 12-6 12-6

190 12-6 12-6

200 12-6 12-6

210 12-6

220 12-6

4HC - ToppedSIMPLE SPAN IN FEET - CENTER TO CENTER OF END BEARINGS (ft)Live Load

(psf)

14

8HC - 8’-0” Untopped Hollow-core sections.

12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

40 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

50 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

60 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

70 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

80 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9

90 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-9

100 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-9 8-10

110 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11

120 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-11

130 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-10 8-11 8-12

140 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13

150 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13 8-14

160 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-14

170 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13 8-14 8-15

180 8-8 8-9 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-15 10-12

190 8-8 8-9 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13 8-14 8-15 10-13

200 8-8 8-9 8-8 8-8 8-8 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-15 10-12 10-13

210 8-8 8-10 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-10 8-12 8-13 8-14 8-15 10-13 10-14

220 8-9 8-10 8-8 8-8 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-15 10-12 10-13 10-14

230 8-9 8-10 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13 8-14 8-15 10-13 10-14 10-15

240 8-9 8-11 8-8 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-14 10-12 10-13 10-14 10-15

250 8-10 8-11 8-8 8-8 8-8 8-9 8-10 8-10 8-11 8-12 8-14 8-15 10-12 10-13

260 8-10 8-11 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-14 10-12 10-13 10-14

270 8-10 8-12 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-15 10-12 10-13 10-14

280 8-11 8-12 8-8 8-8 8-9 8-10 8-11 8-11 8-13 8-14 10-11 10-12

290 8-11 8-12 8-8 8-8 8-9 8-10 8-11 8-12 8-13 8-15 10-12 10-13

300 8-11 8-12 8-8 8-8 8-10 8-10 8-12 8-12 8-13 10-11 10-12 10-13

310 8-12 8-12 8-8 8-9 8-10 8-11 8-12 8-12 8-14 10-11 10-12

320 8-12 8-12 8-8 8-9 8-10 8-11 8-12 8-13 8-15 10-12

330 8-12 8-12 8-8 8-9 8-10 8-11 8-13 8-13 10-11 10-12

340 8-12 8-12 8-8 8-9 8-11 8-12 8-13 8-14 10-11 10-12

350 8-12 8-12 8-9 8-10 8-11 8-12 8-13 8-15

360 8-12 8-12 8-9 8-10 8-11 8-12 8-14 8-15

370 8-12 8-12 8-9 8-10 8-12 8-13 8-14 10-11

380 8-12 8-12 8-9 8-10 8-12 8-13 8-14 10-11

390 8-12 8-12 8-9 8-11 8-12 8-13 8-15

400 8-12 8-12 8-10 8-11 8-12 8-13

410 8-12 8-12 8-10 8-11 8-13 8-14

420 8-12 8-12 8-10 8-11 8-13 8-14

430 8-12 8-12 8-10 8-12 8-13 8-15

440 8-12 8-12 8-11 8-12 8-14 8-15

450 8-12 8-12 8-11 8-12 8-14

Live Load

(psf)

SIMPLE SPAN IN FEET - CENTER TO CENTER OF END BEARINGS (ft)

8HC - Untopped

28 29 30 31 32 33 34 35 36 37 38 39 40 41

40 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-13 8-15 10-11 10-12 10-13 10-14

50 8-8 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-15 10-11 10-12 10-13 10-14

60 8-8 8-8 8-9 8-10 8-10 8-11 8-12 8-13 8-14 8-15 10-12 10-13 10-14 10-14

70 8-9 8-9 8-10 8-11 8-11 8-12 8-13 8-14 8-15 10-12 10-13 10-14 10-15 10-15

80 8-9 8-10 8-11 8-12 8-12 8-13 8-14 8-15 10-13 10-13 10-14 10-15

90 8-10 8-11 8-12 8-12 8-12 8-14 8-15 10-13 10-14 10-14 10-15

100 8-11 8-12 8-12 8-13 8-13 8-15 10-13 10-14 10-15 10-15

110 8-12 8-12 8-13 8-14 8-14 10-13 10-14 10-15 10-15

120 8-12 8-13 8-14 8-15 8-15 10-14 10-15 10-15

130 8-13 8-14 8-15 10-13 10-13 10-14 10-15

140 8-14 8-15 10-13 10-13 10-14 10-15

150 8-15 10-12 10-13 10-14 10-14

160 10-12 10-13 10-14 10-14 10-15

170 10-13 10-14 10-14 10-15

180 10-13 10-14 10-15

190 10-14 10-15

200 10-14 10-15

210 10-15

220 10-15

8HC - UntoppedSIMPLE SPAN IN FEET - CENTER TO CENTER OF END BEARINGS (ft)Live Load

(psf)

15

8HC-Top - 8’-0” Topped Hollow-Core Sections.

12 13 14 15 16 17 18 19 20 21 22 23 24 25

60 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

70 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

80 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

90 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

100 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

110 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

120 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8

130 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9

140 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9

150 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10

160 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10

170 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-10

180 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11

190 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-10 8-11

200 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12

210 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-10 8-11 8-12

220 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13

230 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13

240 8-8 8-9 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-10 8-11 8-13 8-14

250 8-8 8-9 8-8 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13 8-14

260 8-8 8-9 8-8 8-8 8-8 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-15

270 8-8 8-10 8-8 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13 8-14 8-15

280 8-9 8-10 8-8 8-8 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-14 10-13

290 8-9 8-10 8-8 8-8 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-15 10-13

300 8-9 8-10 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13 8-14 8-15 10-13

310 8-9 8-11 8-8 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13 8-14 10-13 10-14

320 8-10 8-11 8-8 8-8 8-8 8-9 8-10 8-10 8-11 8-12 8-13 8-15 10-13 10-14

330 8-10 8-11 8-8 8-8 8-8 8-9 8-10 8-10 8-11 8-13 8-14 10-12 10-13 10-14

340 8-10 8-12 8-8 8-8 8-8 8-9 8-10 8-11 8-12 8-13 8-14 10-12

350 8-10 8-12 8-8 8-8 8-9 8-9 8-10 8-11 8-12 8-13 8-15 10-13

360 8-11 8-12 8-8 8-8 8-9 8-10 8-11 8-11 8-12 8-14 10-12 10-13

370 8-11 8-13 8-8 8-8 8-9 8-10 8-11 8-11 8-12 8-14 10-12 10-13

380 8-11 8-13 8-8 8-8 8-9 8-10 8-11 8-12 8-12 8-15 10-12

390 8-11 8-13 8-8 8-8 8-10 8-10 8-11 8-12 8-13 10-12

400 8-12 8-13 8-8 8-9 8-10 8-10 8-12 8-12 8-14 10-12

410 8-12 8-13 8-8 8-9 8-10 8-11 8-12 8-13 8-14 10-12

420 8-12 8-13 8-8 8-9 8-10 8-11 8-12 8-13 8-15 10-12

430 8-12 8-13 8-8 8-9 8-10 8-11 8-13 8-13

440 8-13 8-13 8-8 8-9 8-11 8-11 8-13 8-13

450 8-13 8-13 8-8 8-10 8-11 8-12 8-13 8-14

460 8-13 8-13 8-9 8-10 8-11 8-12 8-13 8-14

470 8-13 8-13 8-9 8-10 8-11 8-12 8-14 8-15

Live Load

(psf)

8HC - ToppedSIMPLE SPAN IN FEET - CENTER TO CENTER OF END BEARINGS (ft)

26 27 28 29 30 31 32 33 34 35 36 37 38

60 8-8 8-8 8-8 8-8 8-8 8-9 8-11 8-14 10-9 10-10 10-11 10-13 10-15

70 8-8 8-8 8-8 8-8 8-9 8-9 8-11 8-14 10-10 10-10 10-11 10-13 10-15

80 8-8 8-8 8-8 8-9 8-9 8-10 8-11 8-14 10-10 10-11 10-12 10-13 10-15

90 8-8 8-8 8-9 8-9 8-10 8-11 8-11 8-14 10-11 10-12 10-12 10-13 10-15

100 8-8 8-9 8-9 8-10 8-11 8-11 8-12 8-14 10-12 10-13 10-13 10-14 10-15

110 8-8 8-9 8-10 8-11 8-11 8-12 8-13 8-14 10-12 10-13 10-14 10-15

120 8-9 8-10 8-10 8-11 8-12 8-13 8-14 8-15 10-13 10-14 10-15 10-15

130 8-9 8-10 8-11 8-12 8-13 8-14 8-14 8-15 10-14 10-14 10-15

140 8-10 8-11 8-11 8-13 8-13 8-14 8-15 10-13 10-14 10-15

150 8-10 8-11 8-12 8-13 8-14 8-15 10-13 10-14 10-15

160 8-11 8-12 8-13 8-14 8-15 10-13 10-14 10-15

170 8-11 8-12 8-13 8-14 8-15 10-13 10-14 10-15

180 8-12 8-13 8-14 8-15 10-13 10-14 10-15

190 8-12 8-13 8-14 10-13 10-14 10-15

200 8-13 8-14 8-15 10-13 10-14 10-15

210 8-13 8-14 10-13 10-14 10-15

220 8-14 8-15 10-13 10-14 10-15

230 8-14 10-13 10-14 10-15

240 8-15 10-13 10-14 10-15

250 8-15 10-14 10-15

260 10-13 10-14 10-15

270 10-13 10-14

280 10-14 10-15

290 10-14 10-15

300 10-14

8HC - ToppedSIMPLE SPAN IN FEET - CENTER TO CENTER OF END BEARINGS (ft)Live Load

(psf)

16

Detail Design

Cross Section Details The following detailed hollow-core cross sections are produced by EnCon and related companies.

4HC8

4HC10

4HC12

8HC8

8HC10

17

Section Properties

Section Un-Topped 2” Composite-Topped

(f`ctopping = 4000 psi)

Area (in2) Yb (in) I (in4) Wt (psf) Yb (in) I (in4)

4HC8 204 4.08 1629 53 5.37 2950

4HC10 249 5.33 3068 65 6.61 4899

4HC12 282 6.11 5205 74 7.52 7971

8HC8 470 3.96 3525 61.2 5.31 6827

8HC10 582 5.00 6648 72 6.37 11479

Contract Drawings and Information The following information should be provided:

Fire Rating or Resistance Fire ratings are based on a Rational Fire Design calculation method or an IBC Prescriptive Fire Rating method. A fire rating is dependent upon: equivalent thickness, heat transmission thickness, cover on the prestressing strand, and end restraint. A standard 8-inch thick hollow-core system has a 2-hour fire rating, but higher ratings (3- or 4-hour) may be achieved with topping and gypsum board or the application of a spray-on fire-resistant material to the underside of the slab.

Common Details The details on the following pages are non-cross section specific and are applicable in standard bearing and non-bearing conditions. These are not the only design options available. Often they are used as starting points for job-specific section and detail requirements. Connection details will vary slightly depending on whether the slab was produced using a dry cast extrusion or a slip form technique. Designers are strongly encouraged to discuss potential details with the fabricator during design development.

Span directions

Loading requirements o General loading o Line load o Point loading o Diaphragm forces and lateral loads

Conceptual connection information

Supporting elements

Fire resistance requirements

Edge of slab geometry and grid layout

Topping requirements

Opening size and location

18

Hollow-core to Masonry – Load Bearing with Topping

Continuation wall is erected or set in place after hollow-core is erected and grouted

The ends of the core may need to be filled for load transfer

Topping thickness will vary based on the hollow-core camber

Wall thickness will vary depending on EOR and AOR design requirements

19

Hollow-core to Masonry Non-Load Bearing

The ripped end of the core may need to be filled for load transfer



20

Hollow-core to Precast or Cast-in-Place – Non-Load bearing



21

Hollow-core to Steel Wide Flange Alternate

The ends of the core may need to be filled for load transfer

Steel beam based on design loading and EOR requirements

22

Project Specifications (Sample) 1.01 SECTION INCLUDES

A. Floor and roof slabs, related connection plates, brackets, hangers, and grouting of joint keys.

1.02 RELATED SECTION A. Section 03410 – Structural Precast Concrete.

1.03 REFERENCES A. ACI 301 – Structural Concrete for Buildings. B. ACI 318 – Building Code Requirements for Structural Concrete. C. ASTM A36 – Structural Steel. D. ASTM A153 – Zinc Coating on Iron and Steel Hardware. E. ASTM A416 – Uncoated Seven-Wire Stress-Relieved Steel Strand for Prestressed Concrete. F. ASTM A615 – Deformed and Plain Billet-Steel Bars for Concrete Reinforcement. G. ASTM A666 – Austenitic Stainless Steel, Sheet, Strip, Plate, and Flat Bar for Structural Applications. H. ASTM C150 – Portland Cement. I. ASTM C618 -- Fly Ash. J. ASTM C33 -- Aggregates. K. ASTM C260 – Air Entrainment Admixtures. L. ASTM C494 – Water Reducing Agents. M. AWS D1.1 – Structural Welding Code. N. AWS D1.4 – Structural Welding Code – Reinforcing Steel. O. PCI Manual For The Design of Hollow Core Slabs. P. PCI MNL-116 – PCI Structural Quality Control Manual. Q. PCI MNL-120 – PCI Design Handbook. R. PCI MNL-123 – PCI Connections Manual. S. PCI MNL-124 – PCI Design for Fire Resistance of Precast Prestressed Concrete. T. PCI MNL-127 – PCI Erection Tolerances. U. PCI MNL-135 – Tolerances for Precast and Prestressed Concrete. V. IBC – International Building Code.

1.04 DESIGN REQUIREMENTS

W. Size components to withstand design loads. X. Concrete: Minimum compressive strength of 5000 psi at 28 days and 3500 psi at release. Y. Design components to accommodate construction tolerances, deflection of other building structural members and clearances of

intended openings. Z. Grouted Keys; Capable of transmitting horizontal shear force of 80 psi. AA. Calculate structural properties of framing members in accordance with ACI 318.

1.05 SUBMITTALS BB. Shop Drawings: Indicate slab locations, unit identification marks, connection details, edge conditions, bearing requirements, support

conditions, dimensions, openings, openings intended to be field cut, and relationship to adjacent materials. CC. Product Data: Indicate standard component configuration, design loads, deflections, and cambers. DD. Fabricator’s Installation Instructions: Indicate special procedures and perimeter conditions requiring special attention.

1.06 QUALITY ASSURANCE EE. Perform work in accordance with the requirements of PCI MNL-116, PCI MNL-123, and PCI MNL-120. FF. Maintain plant records and quality control program during production of precast slabs. Records available upon request.

1.07 QUALIFICATIONS GG. Fabricator: Company specializing in manufacturing the work of this section and PCI certified. HH. Erector: Company specializing in erecting the work is recommended. II. Design precast concrete members in accordance with PCI Manual For The Design of Hollow Core Slabs, under direct supervision of a

Professional Structural Engineer experienced in design of this work and licensed in the state of the project. JJ. Welder: Qualified in accordance with AWS D1.1.

1.08 REGULATORY REQUIREMENTS KK. Conform to ACI 318 code for design load and on-site construction requirements.

23

LL. Conform to PCI MNL-124, PCI MNL-116, and PCI MNL-135. 1.09 PRE-INSTALLATION CONFERENCE

MM. Discuss anchor and weld plate locations, sleeve locations, and cautions regarding cutting or core drilling.

1.10 DELIVERY, STORAGE, AND HANDLING NN. Lifting or Handling Devices: Capable of supporting member in positions anticipated during manufacture, storage, transportation, and

erection. OO. Mark each member with production identification and orientation (if required.)

1.12 COORDINATION PP. Coordinate work under provisions of separate section.

2.01 FABRICATORS – PCI Certified Plant 2.02 MATERIALS

QQ. Materials: To be in conformance with ACI 318. RR. Tensioning Steel Tendons: ASTM A416 Grade 270. SS. Reinforcing Steel: ASTM A615 or A706, deformed steel bars. TT. Sand - Cement Grout: Sufficient for placement and hydration.

2.03 ACCESSORIES UU. Connecting and Supporting Devices: Conform to PCI MNL-120 plates, angles, items cast into concrete, items connected to steel framing

members, and inserts; ASTM A36 carbon steel. VV. ⅛” bearing material.

2.04 FABRICATION WW. Conform to AWS D1.4 and PCI MNL-116. XX. Embed anchors, inserts, plates, angles, and other items at locations indicated. YY. Provide openings required by other sections at locations indicated. Greater than 12 inches square or in diameter.

2.05 COMPONENTS ZZ. Nominal Thickness: 8 or 10 inches. AAA. Nominal Width: 48 or 96 inches.

2.06 FINISHES BBB. Plant Finish: Finish members to PCI MNL-116 Finish B Grade.

2.07 FABRICATION TOLERANCES CCC. Conform to PCI MNL-116 and PCI MNL-135.

2.08 SOURCE QUALITY CONTROL AND TESTS

DDD. Provide testing and analysis of site-placed concrete and grout under provisions of Section 01400. EEE. Maintain shop inspection and testing reports for stressing tendons. FFF. Test samples in accordance with specified ASTM and ACI standards.

3.0 ERECTION

GGG. Erect members without damage to structural capacity, shape, or finish. Replace or repair damaged members. HHH. Align and maintain uniform horizontal and end joints as erection progresses. III. Install bearing material or shims at bearing ends of slabs as indicated or necessary. JJJ. Adjust differential camber between precast members to tolerance before final attachment and grouting. KKK. Adjust differential elevation between precast members to tolerance before final attachment. LLL. Secure units in place. Grout slab and joints or perform welding in accordance with AWS D1.1.

3.03 ERECTION TOLERANCES MMM. Erect members level and plumb within allowable tolerances. NNN. All work to conform to PCI MNL-127 and PCI MNL-135.

3.04 PROTECTION OF FINISHED WORK OOO. Protect members from damage from other trades by General Contractor throughout the job.

24

General Notes (Sample)

This section includes generic General Notes that may be found on erection drawings or contract documents. 1. Precast units to be designed, detailed, manufactured, delivered, and installed by EnCon or FOB as per

contract.

2. Contractor or Owner to provide free access at job site for delivery, including temporary roadways, crane pad, and crane path.

3. Hollow-core units must be lifted with slings or lifting eyes unless noted otherwise. 4. Do not lift, store, or support slabs in middle unless noted otherwise.

5. Use bearing strips under ends of slab bearing on precast, masonry, and cast-in-place concrete.

6. Level the slab and grout joints.

7. Grouting of longitudinal slab joints by EnCon as per contract.

8. Grouting of slab butt joints and end cells (if required) by EnCon as per contract.

9. All openings under contract must be shown on this layout unless noted otherwise.

10. Any topping, mesh, and drilling or cutting of holes 12” or smaller in any direction is by others.

11. No prestressing strand and/or reinforcing shall be cut in field unless approved by EnCon Design.

12. No walls, pipe, conduit, or other objects to extend above and over bearing surface.

13. All trades are to remain off deck areas until field crews have completed erecting, leveling, and grouting.

14. Reinforcing bars for the grout joints are furnished and installed by EnCon unless noted otherwise.

15. Modifications required due to field survey may be the responsibility of the General Contractor.

16. Any and all hardware supplied by EnCon is indicated by a unique and distinct number on the erection

drawings. All other hardware shown is by others even if not explicitly stated.

17. All masonry surfaces for slab bearing must be solid and have the voids filled or have a bond beam in place.

18. Unless the hollow-core is supported on precast, the building contractor shall be responsible for providing true and level bearing surfaces for its support.

Company Overview The EnCon Companies are specialty contractors providing engineered concrete products and services to the commercial, multi-family residential, heavy highway, and public works construction communities. As a full-service precaster, EnCon manufactures a wide range of architectural and structural building components. Corporate offices and the design group are located in downtown Denver, Colorado. EnCon currently sells its products in 15 states. EnCon entered the precast/prestressed concrete market in early 1993 with the acquisition of Stresscon Corporation, which was founded in 1969. Located on a 68-acre production facility in Colorado Springs, Stresscon Corporation maintains a second plant 20 miles north of Denver in Dacono, Colorado. Stresscon has been serving the Colorado and western United States building industries with quality architectural and structural precast concrete products and innovative building solutions for over 40 years. In 1997 EnCon acquired Atlanta Structural Concrete Company, founded in 1959, and built a new plant in Buchanan, Georgia. Atlanta Structural, with over 50 years in the structural precast industry, constructed a second production facility in Bainbridge, Georgia in 2006. Five additional plants were acquired or built between 1999 and 2004, providing manufacturing locations in Seattle, Portland, San Francisco, Los Angeles, Salt Lake City, and Denver. The EnCon family of companies now consists of nine production facilities. The product line includes architectural and structural building elements, bridge girders and deck panels, CarbonCast®, columns, double tees, hollow-core, insulated and non-insulated wall panels, noise walls, retaining walls, risers, spandrels, stairs, concrete tubes / shafts for stairs, elevator and other mechanical cores. As a certified producer of the Precast/Prestressed Concrete Institute and an AltusGroupTM Producer Member, EnCon is recognized among the leading precast companies in the United States. A broad range of products and exceptional service are the cornerstones of EnCon’s business philosophy. EnCon continues to expand to meet the rising demand for precast/prestressed concrete products and services through geographical and product diversification, cutting-edge design techniques, the development of innovative product lines, and a strategic corporate development program. The EnCon family of companies looks forward to increasing growth, leadership and service to the construction industry.

COLORADO GEORGIA OREGON UTAH WASHINGTON

Contact List:


Hollow-core


Building System

Design Manual

80 DeHunt Drive Buchanan, GA 30113 770.646.1888

8600 Welby Road PO Box 29039 Denver, CO 80229 303.287.4312

101 South Industrial Loop Road Tooele, UT 84074 435.843.4230

3210 Astrozon Boulevard Colorado Springs, CO 80910 719.390.5041

Stresscon Denver Metro Division 5434 Grand View Boulevard Dacono, CO 80514 303.659.6661

2140 South Ivanhoe, Suite 100 Denver, CO 80222 303.298.1900

5415 189th Street East Puyallup, WA 98375 253.846.2774

1615 SE 6th Avenue Camas, WA 98607 360.834.3459

2140 South Ivanhoe, Suite 100 Denver, CO 80222 303.298.1900

Hollow-core Residential Design Manual - EnCon · PDF file3 Introduction This EnCon Hollow-core...

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