ryan johnson - structural option ae senior thesis – 2010 · ryan johnson - structural option. ae...
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800 North GlebeArlington, VA
Ryan Johnson - Structural OptionAE Senior Thesis – 2010
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OUTLINE
•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
•Questions and Comments
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General Building Data
• Location: Arlington, VA
• Occupancy Type: Mixed-Use Office
• Distinctive Architectural Features
• Building Setbacks At Levels 4,6 And 8
•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
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3 Below Grade Parking Levels 1 Level Retail On Ground Level 9 Levels Of Offices
•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
EXISTING STRUCTURE
General Building Data•Size: 316,000 SF
•Completion Date: 2011
•Estimated Project Cost: $62 Million
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EXISTING STRUCTURE
•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
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Existing Structure•Column Foundations Range In Size From 4’-0” Up
To 14’-0”
• Caissons Supporting On-grade Columns
• 6’-0” Thick Mat Foundation Supporting Shearwalls
• 12” Foundation Wall Around Parking Substructure
•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and ConclusionCAISONS
N
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Existing Structure•Post-tensioned Girders With 9” Thick One-Way
Slab
• 10.5” Two-way Slabs Used For Building Stepouts
• Two 12” Think “C” Shaped Shear Walls At The Building’s Core
•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Y
X
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PROJECT GOALS
•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Project Goals• Uniform Slab Type And Thickness
• Uniform Column Sizes
• Reduce Lateral loads Carried By The Shearwalls
• Determine Affects On Floor Plans
• Compare Sequencing And Cost
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STRUCTURAL DEPTH
•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Structural Depth
Design Process
1. Initial Plan Layout
2. Slab Design
3. Lateral System Design
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Slab Design
• Slab Type And Thickness
• Direction Of Banded Tendons
• Tendon Stresses Altered To Account For Opening And Nonuniform Slab Edges
d = 30’ x 12” 45 = 8” two‐way post‐tensioned
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Y - Direction
• Distributed Tendons • 4 7-wire Strands Per Tendon• Uniformly Spaced To Allow For 250 psi Minimum
Precompression Stress
X - Direction
• Tendons Banded Along Column Strip• 25 7-wire Strands Per Tendon Grouping• 650 Kips Average Tendon Forces
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Immediate Load Deflection = Service LC – (Dead +Balanced)
Time Dependent Deflection = Long Term LC–(Dead + Balanced)
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Lateral System DesignInitial Design
•Uniform R-value For Both Directions (R=6)
Initial Design• Shear wall core
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Lateral System DesignRedesign
•Different R-value Per Direction (Rx = 5,Ry = 5.5)•Ordinary Reinforced Shearwall & Duel System
• PT Flat Plate Slabs Used In LFRS Not In Code
Redesign•Shear Wall Core•Concrete Moment Frame Included In Y - Direction
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Lateral System Design
System Comparison
Loading Condition:• Wind Load Case 1 Controlled Both Designs
Displacement• Max X: 53% Reduction• Max Y: 27% Reduction
Story Drift• Max X: 45% Reduction• Max Y: 20% Reduction
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Column Design
EXISTING STRUCTURE
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
DEPTH CONCLUSION
• Uniform Slab Type And Thickness • Reduced Need for PT Girders
• Lateral System Successfully Altered• Building Rotation Reduced• Shear Wall Loads Reduced• Drift And Displacement Reduced
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Architectural Breadth
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
BUILDING ENVELOPE STUDYExisting Curtain Wall• Stick Built • Anchors At Each Level• Aluminum Mullions• Insulating Glass Unit
• ¼” Clear Heat Strengthened Plys• ½” Air Space• Low-E Coating On Surface #2
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
ORIGINAL FLOOR PLAN REDESIGNED FLOOR PLAN
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
ORIGINAL FLOOR PLAN REDESIGNED FLOOR PLAN
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Construction Breadth
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
• 94 Days Of Construction
Thesis Building RedesignCurrent Building
• 43 Days Of Construction
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Original Design
Thesis Building Redesign
Comparison
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
Conclusion:• Uniform Slab Type &Thickness and Column Sizes
• Reduced Floor Weight And Material Use
• Lateral System Modified To Include Moment Frame• Shearwall Loads Reduced
• Floor Plans Were Not Overly Modified
• Sequencing and Cost Increase
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•Project Info
•Existing Structure
•Project Goals
•Structural Depth
•Architectural Breadth
•Construction Breadth
•Comparison and Conclusion
QUESTIONS
Acknowledgements:Structura
The JBG Companies
Cooper Carry
The Pennsylvania State UniversityDr. Linda HanaganProfessor M. Kevin ParfittProfessor Robert HollandProfessor Paul BowersThe entire AE faculty and staff
Special thank you to my parents, my family and my good friends.