1. Ryan Johnson - Structural Option
800 North Glebe
Arlington, VA
Ryan Johnson - Structural Option
AE Senior Thesis – 2010

2. OUTLINE Project Info Existing Structure Project Goals Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Questions and Comments
OUTLINE

3. Project Info General Building Data Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
General Building Data
Location: Arlington, VA
Occupancy Type: Mixed-Use Office
Distinctive Architectural Features
Building Setbacks At Levels 4,6 And 8
Sail-like Sweeping Glass Curtain Walls
Precast Concrete Panels, Decorative Stone And Metal Cladding
Building Setbacks Located At Levels 4, 6, 8

4. EXISTING STRUCTURE Project Info General Building Data Size: 316,000 SF
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
General Building Data
Size: 316,000 SF
Completion Date: 2011
Estimated Project Cost: $62 Million
3 Below Grade Parking Levels
1 Level Retail On Ground Level
9 Levels Of Offices
EXISTING STRUCTURE

5. EXISTING STRUCTURE Existing Structure Project Info Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
EXISTING STRUCTURE

6. Existing Structure N Existing Structure Project Info
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
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 N
CAISONS

7. Existing Structure Existing Structure Project Info
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
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 Y X

8. PROJECT GOALS Existing Structure Project Info Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
PROJECT GOALS

9. Project Goals Project Goals Project Info Existing Structure
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

10. STRUCTURAL DEPTH Structural Depth Project Info Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
STRUCTURAL DEPTH

11. Structural Depth Structural Depth Design Process Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Structural Depth
Design Process
Initial Plan Layout
Slab Design
Lateral System Design

12. Structural Depth Slab Design 30’ x 12” d = = 8” two-way post-tensioned
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
30’ x 12”
d =
= 8” two-way post-tensioned 45

13. Structural Depth X - Direction Y - Direction Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
X - Direction
Distributed Tendons
4 7-wire Strands Per Tendon
Uniformly Spaced To Allow For 250 psi Minimum Precompression Stress
Y - Direction
Tendons Banded Along Column Strip
25 7-wire Strands Per Tendon Grouping
650 Kips Average Tendon Forces

14. Structural Depth Project Info Existing Structure Project Goals
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Immediate Load Deflection =
Service LC – (Dead +Balanced)
Time Dependent Deflection =
Long Term LC–(Dead + Balanced)

15. Structural Depth Lateral System Design Initial Design Initial Design
Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Lateral System Design
Initial Design
Uniform R-value For Both Directions (R=6)
existing had not included basement
Initial Design
Shear wall core

16. Structural Depth Lateral System Design Redesign Redesign Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Lateral System Design
Redesign
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

17. Structural Depth Lateral System Design System Comparison
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

18. EXISTING STRUCTURE Structural Depth Column Design Project Info
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Column Design
EXISTING STRUCTURE

19. Structural Depth DEPTH CONCLUSION 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

20. Architectural Breadth
Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Architectural Breadth

21. BUILDING ENVELOPE STUDY
Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
BUILDING ENVELOPE STUDY
Existing 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

22. Architectural Breadth
Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
ORIGINAL FLOOR PLAN
REDESIGNED FLOOR PLAN

23. Architectural Breadth
Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
ORIGINAL FLOOR PLAN
REDESIGNED FLOOR PLAN

24. Construction Breadth Construction Breadth Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Construction Breadth

25. Thesis Building Redesign
Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Current Building
Thesis Building Redesign
43 Days Of Construction
94 Days Of Construction

26. Thesis Building Redesign
Project Info
Existing Structure
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Original Design
Comparison
Thesis Building Redesign

27. Comparison and Conclusion
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

28. QUESTIONS Acknowledgements: Project Info Existing Structure Structura
Project Goals
Structural Depth
Architectural Breadth
Construction Breadth
Comparison and Conclusion
Acknowledgements:
Structura
The JBG Companies
Cooper Carry
The Pennsylvania State University
Dr. Linda Hanagan
Professor M. Kevin Parfitt
Professor Robert Holland
Professor Paul Bowers
The entire AE faculty and staff
Special thank you to my parents, my family and my good friends.
QUESTIONS