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800 North Glebe Arlington, VA

800 North Glebe Arlington, VA. Ryan Johnson - Structural Option AE Senior Thesis – 2010. Project Info Existing Structure Project Goals Structural Depth Architectural Breadth Construction Breadth Comparison and Conclusion Questions and Comments. OUTLINE. Project Info

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800 North Glebe Arlington, VA

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

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

  3. Project Info • 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

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

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

  9. 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

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

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

  12. 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. 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. 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)

  15. 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) • Initial Design • Shear wall core

  16. 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. 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. Project Info • Existing Structure • Project Goals • Structural Depth • Architectural Breadth • Construction Breadth • Comparison and Conclusion Column Design EXISTING STRUCTURE

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

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

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

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

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

  27. 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. Project Info • Existing Structure • 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

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