Robert M. Arnold Robert M. Arnold BuildingBuilding

Fred Hutchinson Cancer Research Fred Hutchinson Cancer Research CenterCenter

Project Team Architecture

Construction Management

Mechanical & ElectricalAffiliated Engineers Inc.

StructuralKPFF Consulting Engineers

Zimmer Gunsul Frasca Partnership

Turner construction Company

1100 Fairview Seattle, Washington

$90,825,000

LEED Certified Building

Office SpaceParking Garage

Laboratories

2005 Masonry Honor Award

372,503 ft2

Existing Structural SystemG

ravit

y S

yst

em

Typical Bay

Plaza

5th Floor Laboratories

Mechanical Level, Roof, & Penthouse

Distributed & Banded Tendons

Post-Tensioned

[30’ x 30’]

8 ½” Flat Plate w/ Drop Panels

Beam Size VariesOne-Way Slabs w/ Beams

Cast in Place Reinforced Concrete Slab

Steel Framing

Rectangular HSS Columns

W Shape Beams

13” Reinforced Concrete Slab

30'

30'

10'

10'

Existing Structural SystemLa

tera

l S

yst

em

Reinforced Concrete Shear Walls20” & 24” thick

Special Boundary Elements

Braced Frames (Upper Levels)Chevron Braces

X-BracesDiagonal Braces

Seismic Controls Design

Base Shear: 5980 kip

Proposed Alternative Structural Design

Proposal: Frame Main Portion of Building out of Steel

Why?:Reduce Building Mass

Improve ConstructabilityWhy Not the Entire

Building: PLaza & Parking GarageMechanical, Roof, & Penthouse

New Structural System

Composite Beams

Steel Columns

Floor Framing

Composite Girders

RAM Structural System

Typical Sizes

W 16 x 26

W 16 x 31

Typical Sizes

W 24 x 55

W 21 x 50

Typical Sizes

W

W

Typical Live Load: 75 lb/ft2

New Structural System

EXCEPTION:

Minimal Architectural Impact

Floor

Fram

ing

1 Column addition

Architectural Considerations

Columns – maintain location as per original design

Discontinued @ & below Level 1

Vibrations: Preliminary Analysis 5th Floor – Laboratory Area

Evaluation for Walking Excitation

Lab Equipment is more sensitive to vibration

Second analysis recommended

ap = 0.00408 < 0.005

Braced Frames

Columns: W14 Shapes

X – Bracing: Rect.HSS columns

Ordinary Braced Frames

Concentrically Braced Frames

Special Braced Frames

Simplifying the Design Process

Grouped Structure down to Level 5

Construction Management of Alternative Design

Steel Alternative Cost was Estimated using Integrate Cost Estimating

Overall savings

Complete Building Cost Estimate was not completed-

Steel Alternative Cost was Estimated using Integrate Cost Estimating

$1.8 million

Green Roof RetrofitBenefits

Rainwater Retention & DetentionOffsets peak runoff from peak rainfallLower roof surface temperature during summerhelps to reduce the urban heat island effect

Types of Green RoofsExtensiveSemi-intensiveIntensive

Back

gro

un

d

Benefits

Rainwater Retention & Detention

Lower roof surface temperature during summer

Helps to reduce the urban heat island effect

Green Roof: Architectural Design

Potential Areas for Green Roof– Intensive

• roof area accessible & viewable by the existing roof terrace

– Extensive• upper roof• lower roof

– None• stairwells• small area with limited access• mechanical enclosures• skylights• plaza

Green Roof Design Decision– Intensive

• NONE– Intensive

• All Potential Areas not f easibil e

intensive gr eenr oofextensive gr eenr oofnot possibl e

Green Roof: Architectural Design

Roof

Con

stru

ctio

n

[Gardendrain GR 30]

Sedum Planting Layer

Rigid Insulation

6” Roof Lite Extensive MC

Root Barrier

Hydrotech Gardendrain GR 30

EPDM [ Water Proofing Membrane]

Green Roof: Drainage

Stormwater RunoffRational Method (Runoff Model)

Typical Roof: 0.95

Does Not consider delayed runoff rate

Design Rainfall: 1 inch/hour

Leader SizingBased on Projected Area

& Percentage of Vertical Surface Areas

Lawn (Sandy Soil): 0.10

During sustained storm event rate can reach that of typical roof

Total Drainage Rate: 19 gpm

(28) 2 inch Leaders

(14) 3 inch Leaders

Total Drainage Area: 76,425 ft2

Green Roof: Construction Management

Cost Analysis [RS Means Renovation & Maintenance]

Replacement w/ Ballasted EPDM

Replacement w/ Green Roof

Ballasted EPDM: 3 @ $253,000 = $759,000Life Cycle [50 year period]

Extensive Sedum: 1 @ $360,000 = $360,000

@ $4.55/ft2 = $253,000

@ $6.47/ft2 = $360,000

Recommendation: Green Roof Installation @ Time of Replacement

Questions ?