Post on 03-Jan-2016
The Odyssey Condominium
Arlington, Virginia
Aaron SnyderAaron Snyder
Structural OptionStructural Option
Senior ThesisSenior Thesis
Spring 2006Spring 2006
The Odyssey Condominium
Arlington, VirginiaOutline
Building Introduction
Structural Description
Proposal
Structural Design
Flat Plate
Columns
Lateral System
Construction Study
Cost Comparison
Schedule Comparison
Building Envelope
Conclusion
Acknowledgments
The Odyssey Condominium
Arlington, VirginiaBuilding Introduction
Location
Arlington, Virginia - Court District
15th Street and Clarendon Boulevard
The Odyssey Condominium
Arlington, VirginiaBuilding Introduction
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
The Odyssey Condominium
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.
The Odyssey Condominium
Arlington, VirginiaBuilding Introduction
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
The Odyssey Condominium
Arlington, VirginiaOutline
Building Introduction
Structural DescriptionProposal
Structural Design
Flat Plate
Columns
Lateral System
Construction Study
Cost Comparison
Schedule Comparison
Building Envelope
Conclusion
Acknowledgments
The Odyssey Condominium
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’
Structural Description
The Odyssey Condominium
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
Structural Description
The Odyssey Condominium
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”
Structural Description
A
B
C,C1
E
The Odyssey Condominium
Arlington, VirginiaOutline
Building Introduction
Structural Description
ProposalStructural Design
Flat Plate
Columns
Lateral System
Construction Study
Cost Comparison
Schedule Comparison
Building Envelope
Conclusion
Acknowledgments
The Odyssey Condominium
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
The Odyssey Condominium
Arlington, VirginiaOutline
Building Introduction
Structural Description
Proposal
Structural DesignFlat Plate
Columns
Lateral System
Construction Study
Cost Comparison
Schedule Comparison
Building Envelope
Conclusion
Acknowledgments
The Odyssey Condominium
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
The Odyssey Condominium
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
The Odyssey Condominium
Arlington, VirginiaFlat Plate Design
Offset Column Design Strip Idealization
Offset Strip
Design Strip
The Odyssey Condominium
Arlington, VirginiaFlat Plate Design
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
The Odyssey Condominium
Arlington, VirginiaFlat Plate Design
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
The Odyssey Condominium
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
The Odyssey Condominium
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
The Odyssey Condominium
Arlington, VirginiaLateral Design
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
The Odyssey Condominium
Arlington, VirginiaLateral Design
Shear Walls
Added to resist imposed seismic loads
Analyzed in iterations by extruding shear walls A & B
Displacement : 6”
Lateral design adjustment
The Odyssey Condominium
Arlington, VirginiaLateral Design
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”
The Odyssey Condominium
Arlington, VirginiaOutline
Building Introduction
Structural Description
Proposal
Structural Design
Flat Plate
Columns
Lateral System
Construction StudyCost Comparison
Schedule Comparison
Building Envelope
Conclusion
Acknowledgments
The Odyssey Condominium
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
The Odyssey Condominium
Arlington, VirginiaOutline
Building Introduction
Structural Description
Proposal
Structural Design
Flat Plate
Columns
Lateral System
Construction Study
Cost Comparison
Schedule Comparison
Building Envelope
Conclusion
Acknowledgments
The Odyssey Condominium
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
The Odyssey Condominium
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.
The Odyssey Condominium
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