Presentation Outline...Building Overview 3- Bedroom2- Bedroom 2- Bedroom Architectural Breadth...

Kurt Krasavage Structural OptionChevy Chase, Maryland

Presentation Outline

- Building OverviewBuilding Overview- Thesis Objective- Architectural Breadth Study- Structural Depth Study- Construction Breadth Study

S mmar and Concl sions- Summary and Conclusions- Acknowledgements- Questions

Building Overview

Features

15 - Story, U-shaped residential tower consisting of 432 units within a world-class urban development.

Building Overview

Thesis Objective

Architectural Breadth

LocationProject TeamStructural System

2 - levels of underground parking

1,000 S.F. pool located on the 13th fl

Structural Depth

Construction Breadth

Conclusions

Acknowledgements

Size: 479,000 S.F.Cost: $94 MillionDates of Construction:

May 2006 – February 2009

13th floor.g

Questions

Building OverviewBuilding OverviewThesis Objective

Architectural Breadth FeaturesStructural Depth


Conclusions

Acknowledgements


g

Questions

Building OverviewOwner/Developer:Archstone-SmithArchitect:

SK&I Architectural Design GroupLandscape Architect: SK&I Architectural Design Group

Owner

Turner Construction

Building Overview

Thesis Objective

Architectural Breadth FeaturespCarol R. Johnson Associates

Structural Engineer:Smislova, Kehnemur, & Associates

MEP Engineer:GHT Limited

Civil Engineer:

SK&I Architectural Design Group

SubcontractorsSmislova Kehnemur & Associates

GHT Limited

Turner ConstructionStructural Depth


Conclusions

Acknowledgements


Loiederman Soltesz AssociatesInterior Designers:

Handel ArchitectsGeneral Contractor:

Turner Construction

SubcontractorsSmislova, Kehnemur, & Associates

Loiederman Soltesz Associates

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Questions

Building OverviewThe foundations consist of spread and combined footings.

Foundations

Flat plate 7 ½” thick unbounded post‐tension slabs, with two‐way bottom

Typical FloorsBuilding OverviewThesis Objective

Architectural Breadth FeaturesThese footings are typically 12’ X 12’ by 24” thick.

p , yreinforcement of #[email protected]” continuous bars each way.

Normal weight concrete at 5000 psi.

f fReinforced concrete columns that

Columns

Structural Depth


Conclusions

Acknowledgements


The post‐tension cables consist of uniform tendons being pulled in the S‐N direction and the banded tendons are in the pulled in the W‐E direction of the building

Reinforced concrete columns that are typically 16”x28” and 16”x32”. The typical reinforcement is 8 #7 or 8 #8 bars, but varies throughout typical levels.

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Questions

Building Overview•Concrete shear walls around the two elevator cores.

Lateral SystemBuilding OverviewThesis Objective

Architectural Breadth Features

•Three other shear walls spread out on the west wing side of the building.

Typical thickness of each shear

Structural Depth


Conclusions

Acknowledgements


•Typical thickness of each shear wall is approximately 12”

g

Questions

Thesis Objective

Architectural Breadth • Integrate a new column layout that coincides with

Architectural Goals

• Design floor system and supporting elements to resist

Structural GoalsConstruction Goals

Accelerate the speed of

Building Overview

Thesis Objective


Structural DepthConstruction Breadth

layout that coincides with existing building architecture

• Improve overall quality of floor plans

supporting elements to resist gravity loading for the proposed building

•Design a lateral system that will resist wind and seismic

Accelerate the speed of construction and save the owner as much money as possible

Structural Depth


Conclusions

Acknowledgements• Design apartments that meet square footage requirements while maintaining style, shape, and overall quality

will resist wind and seismic forces due to strength and servicability for the proposed structure

g

Questions

Architectural BreadthThesis Assumption

Proposed Layout Building Dimensions

Assume that the two levels f d d ki ill

Building Overview

Thesis Objective

Architectural BreadthBuilding DimensionsSquare FootageLocation of Lateral Resisting ElementsFunctionalismInclusive Floor Plan

of underground parking will be capable of being integrating within the proposed column layout

Structural Depth


Conclusions

AcknowledgementsEnlarged View of Typical Apartments

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Questions

Architectural BreadthExisting Building Proposed Layout

Building Overview

Thesis Objective

Architectural Breadth Proposed Layout Building Dimensions

Structural Depth


Conclusions

Acknowledgements

Building DimensionsSquare FootageLocation of Lateral Resisting ElementsFunctionalismInclusive Floor Plang

QuestionsEnlarged View of Typical Apartments

Architectural BreadthFloor-to-Floor HeightsBuilding Dimensions

Building Overview

Thesis Objective


Structural Depth


Conclusions

Acknowledgements



Architectural BreadthBuilding OverviewThesis Objective


Structural Depth


Conclusions

Acknowledgements



Architectural BreadthProposed BuildingExisting Building

Building Overview

Thesis Objective


Structural Depth


Conclusions

Acknowledgements



Architectural BreadthBuilding OverviewThesis Objective


Structural Depth


Conclusions

Acknowledgements



Architectural BreadthStudio 1- BedroomBuilding OverviewThesis Objective


500 S.F712 S.F

Structural Depth


Conclusions

Acknowledgements



Architectural Breadth1- Bedroom 1- BedroomBuilding OverviewThesis Objective


600 S.F1000 S.F

Structural Depth


Conclusions

Acknowledgements



Architectural Breadth2- Bedroom 2- Bedroom3- BedroomBuilding OverviewThesis Objective


1400 S.F1062 S.F

Structural Depth


Conclusions

Acknowledgements

Building DimensionsSquare FootageLocation of Lateral Resisting ElementsFunctionalismInclusive Floor Plan

712 S.F.

g


Structural Depth

Alternate Systems

Composite Deck w/ Non-Composite Steel Framing

Post-TensionedBuilding Overview

Thesis Objective

Architectural Breadth yOverview of Girder-SlabFloor FramingWind DistributionSeismic DistributionBraced Frames

Two-way Flat Plate

Girder-Slab

Structural Depth


Conclusions

Acknowledgements Braced FramesDrift

g

Questions

Structural DepthGirder-Slab Advantages

•Low floor-to-floor heights

S f d b ildi l i

Building Overview

Thesis Objective

Architectural Breadth Alternate Systems• Super-fast structure and building completion

• Reduced building structure weight

• Limited weather impact

Structural Depth


Conclusions

Acknowledgements

yOverview of Girder-SlabFloor FramingWind DistributionSeismic DistributionBraced Frames

• Limited on-site labor

• Reduced on-site overhead costs

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Questions

Braced FramesDrift

Structural DepthPrecast Hollow Core Planks

Building Overview

Thesis Objective

Architectural Breadth Alternate Systems

Supporting D-Beams

Structural Depth


Conclusions

Acknowledgements

yOverview of Girder-SlabFloor FramingWind DistributionSeismic DistributionBraced Framesg

Questions

Braced FramesDrift

Structural Depth

Girders

Main Roof FramingBuilding OverviewThesis Objective

Architectural Breadth Alternate SystemsGirders

BeamsW16X31

W24X68Structural Depth


Conclusions

Acknowledgements

yOverview of Girder-SlabFloor FramingWind DistributionSeismic DistributionBraced Frames

W12X40 through W12X120

Columnsg

Questions

Braced FramesDrift

Structural DepthExisting Building Wind Distribution Proposed Building Wind Distribution

Building Overview

Thesis Objective

Architectural Breadth Alternate SystemsStructural Depth


Conclusions

Acknowledgements


Questions

Braced FramesDrift

Structural DepthExisting Building Seismic Distribution Proposed Building Seismic Distribution

Building Overview

Thesis Objective

Architectural Breadth Alternate SystemsStructural Depth


Conclusions

Acknowledgements


Questions

Braced FramesDrift

Braced FramesEast – West DirectionBuilding Overview

Thesis Objective


Structural Depth

Structural Depth


Conclusions

Acknowledgements


Questions

Braced FramesDrift

Braced Frames North - South DirectionBuilding Overview

Thesis Objective


Structural Depth

Structural Depth


Conclusions

Acknowledgements


Questions

Braced FramesDrift

Drift due to WindNorth - South Direction

Drift due to WindEast – West DirectionBuilding Overview

Thesis Objective


Structural Depth

Structural Depth


Conclusions

Acknowledgements


Questions

Braced FramesDrift

Drift due to SeismicNorth - South Direction

Drift due to SeismicEast – West Direction

Building Overview

Thesis Objective


Structural Depth

Structural Depth


Conclusions

Acknowledgements


Questions

Braced FramesDrift

Cost Analysis

Existing Building Cost Proposed Building CostBuilding Overview

Thesis Objective



Scheduling ImpactsEstimated Revenue

Structural Depth


Conclusions

AcknowledgementsProposed building is approximately 25% more expensive to construct

g

Questions

Existing Building Schedule Proposed Building ScheduleBuilding Overview

Thesis Objective

Architectural Breadth Cost Analysis


Proposed building will decrease duration of construction of the structure by 4 - months

Structural Depth


Conclusions

Acknowledgements


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Questions

Existing BuildingRent Generated per Month

Proposed BuildingRent Generated per MonthBuilding Overview

Thesis Objective



Structural Depth


Conclusions

Acknowledgements


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Questions

Revenue generated by Rent Proposed BuildingRent Generated per MonthBuilding Overview

Thesis Objective



Structural Depth


Conclusions

Acknowledgements


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Questions

Conclusion and Summary

Architectural Breadth• Integrate a new column layout that coincides with existing building architecture

Architectural Goals Summary• 17’ X 28’ bays with braced frames• Gained an additional 45,000 S.F. which resulted in 70 more apartments• Corridors were shortened and opened up t t th f li f lki th h

Building Overview

Thesis Objective


Structural DepthConstruction BreadthOverall Conclusion

existing building architecture

• Improve overall quality of floor plans

• Design apartments that meet

to prevent the feeling of walking through a tunnel• An additional elevator was integrated with proposed system•Architecture not only complied with square footages but provided more variety i e non-

Structural Depth


Conclusions

Acknowledgements es g apa e s a eesquare footage requirements while maintaining style, shape, and overall quality

footages, but provided more variety, i.e. non-typical apartments, option of a 3-bedroom and also used the concept of mirroring apartments to save money on construction costs.

g

Questions

Summary• Foundations will not significantly change due to the loading on columns and weight of the building

R ll d W12 h li d d

• Design floor system and supporting elements to resist gravity loading for the proposed

Structural GoalsBuilding Overview

Thesis Objective



Architectural Breadth• Rolled W12 shapes were spliced and redesigned every 4- floors

•8” x 4’0” Hollow core planks with a 2” topping spanned 28’, while DB9 X46 beams spanned 17’ Typical grout; 6ksi

gravity loading for the proposed building

•Design a lateral system that will resist wind and seismic forces due to strength and

Structural Depth


Conclusions

Acknowledgements


beams spanned 17 . Typical grout; 6ksi

• Lateral system consisted of 20 specially concentric braced frames that resisted strength and met servicability requirements for drift due to seismic and wind loads

o ces due o s e g a dservicability for the proposed structure

g

Questions

Summary• Proposed building system was found to be approximately 25% more expensive to construct upfront• Proposed system was estimated to cost $7 876 923 00

Construction Goals

Accelerate the speed of construction and save the

Building Overview

Thesis Objective



Architectural Breadth$7,876,923.00• Highly probable that the proposed building will be completed at least 4- months earlier than existing building• The addition apartments will generate enough revenue to offset the cost of

construction and save the owner as much money as possible

Structural Depth


Conclusions

Acknowledgements


enough revenue to offset the cost of construction and additionally save the owner $750,000,000• Additional revenue for the 70 additional apartments will generate income throughout the life of the building

g

Questions

Overall Conclusion and Recommendation

Changing the current structural system of a two-way flat plate post-tensioned slab with shear walls to a precast girder slab floor utilizing

Thesis Assumptions

•Assume that the two levels of underground parking will be

Building Overview

Thesis Objective



Architectural Breadthprecast girder-slab floor utilizing braced frames would save the owner approximately $750,000 and improve the overall floor plan. This number does not include the future revenue generated by the 70

g p gcapable of being integrated within the proposed column layout

Structural Depth


Conclusions

Acknowledgements


g yadditional apartment throughout the life of the building

g

Questions

AcknowledgementsAcknowledgements

• My parents, Stuart and Jacqueline Krasavage

Building Overview

Thesis Objective


Questions

g• Turner Construction• Richard Murphy• Dr. Ali Memari• Professor Robert J. Holland• John Matuszewski & Neil Atkinson

All i d t f i l th t

Structural Depth


Conclusions

Acknowledgements• All industry professionals that

provided information• All AE professors• Fellow 5th year Architectural

Engineering

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Questions

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