The Odyssey Condominium Arlington, Virginia Aaron Snyder Structural Option Senior Thesis Spring 2006

The Odyssey Condominium

Arlington, Virginia

Aaron SnyderAaron Snyder

Structural OptionStructural Option

Senior ThesisSenior Thesis

Spring 2006Spring 2006


Arlington, VirginiaOutline

Building Introduction

Structural Description

Proposal

Structural Design

Flat Plate

Columns

Lateral System

Construction Study

Cost Comparison

Schedule Comparison

Building Envelope

Conclusion

Acknowledgments


Arlington, VirginiaBuilding Introduction

Location

Arlington, Virginia - Court District

15th Street and Clarendon Boulevard



Total Area: 475,650 sq. ft.

16 Level Residential Tower (1-16)

320 Condominium Units

Custom Platinum Suites

3 Levels of Underground Parking (B3-B1)

2-3 Story Townhouses"Special Affordable Housing Protection

District" (SAHPD)

Commercial Space

Project Cost: $65 Million

Project Duration: April 2004 – June 2006


Arlington, VirginiaDesign Professionals

• Owner Monument Realty, LLC

• Architect Shalom Baranes Associates

• Structural Ehlert / Bryan Inc. Engineer

• Construction Donohoe Construction Co. Manager

• Mechanical Mendoza, Ribas, Farinas & Associates Engineer

• Curtain wall Emmitsburg Glass Co.

• Concrete SMC Concrete Construction, Inc.



Building Envelope:

Full Height Aluminum Curtain Walls

- East Elevation

Brick Veneer and Sliding Windows

Mechanical:

Residential Units: 600-1800 CFM water to air heat pumps

14,000 CFM HVAC unit supplies 100% outside air to public corridors

Architecture:

Concrete column and steel-beam trellis framework




Structural DescriptionProposal

Structural Design

Flat Plate

Columns

Lateral System

Construction Study

Cost Comparison

Schedule Comparison

Building Envelope

Conclusion

Acknowledgments


Arlington, Virginia

Floor Systems

Garage Levels:

8.5” 2-way Reinforced Flat Platew/ Drop Panels

Concrete Strength:Levels B3-B1 5000psi

Residential Levels:

8” 2-way Post-Tensioned Flat Plate

Concrete Strength:Levels 1-4 6000psiLevels 5-16 5000psi

25’ x 22’ and 25’ x 28’



Arlington, Virginia

Columns

Residential Levels:

18” x 26” with #11 bar reinforcement (TYP.)

Concrete Strength:Levels 1-4 : 8000psiLevels 5 : 6000psiLevels 6-16 : 5000psi

- Concrete Strength Varies to Maintain Uniform Size

Foundation

Concrete Column Footings

Partial Mat Footings



Arlington, Virginia

Lateral System

Dual System:

Concrete Shear Walls 4000psiOrdinary Concrete Moment Frames

- Slab Frame System

Shear Walls: A & B: B3 – 4th Levels

14” x 10’-0”10” x 17’-0”

C , C1 : 1st – 16th Levels10” x 13’-10.5”

E: 1st – 14th Levels10” x 29’-5”

Reinforcement: #5 & #6 @ 12”


A

B

C,C1

E





ProposalStructural Design

Flat Plate

Columns

Lateral System

Construction Study

Cost Comparison

Schedule Comparison

Building Envelope

Conclusion

Acknowledgments


Arlington, VirginiaProposal

The Odyssey was designed with consideration of height restrictions

A minimum floor-to-floor height was required over 16 levels

An 8” 2-way post-tensioned flat plate was designed

Is There a Feasible Alternative Floor System ?

Design CriteriaMinimum Structural DepthMaintain Existing Residential Layout

Column LocationsMaintain Floor-to-Ceiling Height: 8’ – 8”Limit Building Height : 180’IBC 2003 / ASCE7-02

Reinforced 2-way Flat Plate Design





Proposal

Structural DesignFlat Plate

Columns

Lateral System

Construction Study

Cost Comparison

Schedule Comparison

Building Envelope

Conclusion

Acknowledgments


Arlington, VirginiaStructural Design

Design Program

Design Loads:Dead: Live:Roof 50 psf Roof 30 psfMech. 150 psf Mech. 150 psfRes. 27 psf Res. 40 psfFaçade 32 psf Public 100 psf


Arlington, VirginiaFlat Plate Design

Flat Plate Thickness

Minimum Thickness – ACI 318-05 Table 9.5(c)

Exterior Panel Without Edge Beams ln/30 11”

Interior Panel ln/33 10”

Maximum Deflection – 5000psi Slab

Long Term Dead Load

/ Short Term Live Load l/480

Δmax = Δcol x,y + Δmid y,x 11” ok

Punching Shear – ACI 318-05 11.12.2.1

Vc = 4 √f’c bo d - Controlled 11” ok



Offset Column Design Strip Idealization

Offset Strip

Design Strip



Equivalent Frame Method - ADOSS

Residential: Dead Load (27psf) / Live Load (40psf)

Minimum Development Lengths

Overall Steel Weight : #4 / #6 - 41.1 tons

#5 / #7 - 46.3 tons



Equivalent Frame Method - ADOSS

Lateral Analysis – 10% Story Force

Minimum Development Lengths

Overall Steel Weight : #4 / #6 - 41.1 tons

Lateral : #4 / #6 - 42.4 tons


Arlington, VirginiaColumn Design

Design Objectives:

Minimum Column Dimensions

Maintain Architectural Integrity

Design Uniform Column Size

Critical Columns:Large Tributary AreasColumn Load-Take down (Public Space 100psf)Biaxial Bending

Design Size: 20” x 26” 22” x 28”

Concrete Strength:Levels 1-4 : 8000psiLevels 5 : 6000psiLevels 6-16 : 5000psi


Arlington, VirginiaLateral Design

Assumption: The Flat Plate Would Act as a Cracked Section Limiting Stiffness

Design Objective:

Adhere to the Existing Architectural Program

Limit Displacement (H/600) – Brick Veneer

Limit Story Drift (.02hsx) – Seismic Use Group I

Design Loads:

Wind and Seismic Loads : ASCE7-02Analytical Procedure – Tributary Area Equivalent Lateral Force Procedure

Seismic Controls

Account for the Increase in Building Height and Weight



Lateral Loading

Full wind loads were applied in all principle and intermediate directions

Wind load cases were applied in accordance with ASCE7-02

Maximum drift at the building corners



Shear Walls

Added to resist imposed seismic loads

Analyzed in iterations by extruding shear walls A & B

Displacement : 6”

Lateral design adjustment



Slab Frame / Shear Walls

Integrated Slab Frame – Moment Frames

The slab frame system was simulated as beams with the same structural depth as the flat plate

Shear walls A & B extended to the 14th level

Displacement : 3”





Proposal

Structural Design

Flat Plate

Columns

Lateral System

Construction StudyCost Comparison

Schedule Comparison

Building Envelope

Conclusion

Acknowledgments


Arlington, VirginiaCost Comparison

Typical Residential Level: Average Square Foot Cost

Material Take-off: R.S. Means

Flat Plate Columns Shear Walls

$ 21/SF $ 26/SF





Proposal

Structural Design

Flat Plate

Columns

Lateral System

Construction Study

Cost Comparison

Schedule Comparison

Building Envelope

Conclusion

Acknowledgments


Arlington, VirginiaConclusion

Proposed Flat Plate System:

Ceiling height maintained : 8’ – 8”

Overall building height < 180’

Increase in structural depth : 8” to 11”

Adjustment in column size

Integrated slab frame system: Added shear walls

Induced Construction Cost


Arlington, VirginiaConclusion

Through my analysis I came to the conclusion that although the proposed system met design criteria, the structural design of the building and associated costs are more feasible with a 2-way post-tensioned flat plate design.


Arlington, VirginiaAcknowledgements

AE faculty :

Professor M. Kevin Parfitt

Dr. Linda Hanagan

Dr. Thomas Boothby

Ehlert / Bryan Inc.

Jason Sparrow

Donohoe Construction Co.

Jon Peterson

Friends, Family, and Fellow Students


Arlington, Virginia

?Questions

Documents

The Odyssey Condominium Arlington, Virginia Aaron Snyder Structural Option Senior Thesis Spring 2006