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Office Building B

Office Building B. Margaret Stasia Machinsky Structural Option Senior Thesis Presentation. Presentation Outline Introduction & Building Background Owner & Design Professionals Existing Conditions Proposal Structural Depth Study Construction Management Breadth Study

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Office Building B

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  1. Office Building B Margaret Stasia Machinsky Structural Option Senior Thesis Presentation Senior Thesis Presentation

  2. Presentation Outline Introduction & Building Background Owner & Design Professionals Existing Conditions Proposal Structural Depth Study Construction Management Breadth Study Architectural Security Breadth Study Conclusions Questions Office Building B Senior Thesis Presentation

  3. Located in Ontario, CA (40 miles east of L.A.) 6 Story office building 150,000 S.F. One of 3 structures on complex Construction Dates: TBD Introduction & Background Senior Thesis Presentation

  4. Owner & Design Professionals Office Building B Senior Thesis Presentation

  5. Privately Owned Structural Engineer – John A. Martin & Associates Los Angeles, CA Architect – PGAL Architects Los Angeles, CA MEP Firm – JBA Consulting Engineers Costa Mesa, CA Owner &Design Professionals Senior Thesis Presentation

  6. Existing Conditions Office Building B Senior Thesis Presentation

  7. Superstructure – A992 Gr. 50 steel framing Facade – Architectural brick & precast concrete Foundation – 5” thick slab on grade with grade beams & spread footings Floor System – Composite deck system Existing Conditions Senior Thesis Presentation

  8. Composite deck floor 3” 20 gauge metal deck 3.25” lt. wt. concrete fill #4 reinforcing bars & welded wire fabric ¾” diameter shear studs Existing Conditions Senior Thesis Presentation

  9. Floor Framing System Typical bays: 30x 33 Beam size range: W21x50 – W21x73 Existing Conditions Senior Thesis Presentation

  10. Gravity Columns Interior column tributary area: 995 S.F. Exterior column tributary area: 645 S.F. Column size range: W10x88 – W10x45 All columns span 2 floors w/ 4-0” splices Connect to A572 Gr. 50 base plates w/ 1”  anchor bolts Existing Conditions Senior Thesis Presentation

  11. Lateral System Dual system Moment frames Braced frames Existing Conditions Senior Thesis Presentation

  12. Moment Frames Beams range from W36s – W27s Columns are W14s Columns frame into grade beams Existing Conditions Senior Thesis Presentation

  13. Braced Frames Beams are W21s Columns are W14s Existing Conditions Senior Thesis Presentation

  14. Proposal Office Building B Senior Thesis Presentation

  15. Investigate as Prototype Building New location Washington, D.C. Study alternate lateral system Remove moment frames and utilize strictly braced frames Investigate Architectural Security Design Criteria Reduce the cost of fabricating moment connections Maintain open floor plan Proposal Senior Thesis Presentation

  16. Solution Process Lateral System Calculate new loads (ASCE 7-05) Analyze braced frames in RAM Advanse, RAM Structural Security measures Investigate site plan for security modifications Cost Analysis Calculate cost savings for removing moment connections Proposal Senior Thesis Presentation

  17. Structural Depth Study Office Building B Senior Thesis Presentation

  18. Procedure Calculate new wind and seismic loads Model building in RAM Structural Analyze frames in RAM Advanse for preliminary sizes Use RAM Frame to check drift limitations Structural Depth Study Senior Thesis Presentation

  19. New Lateral Loads Wind controls over seismic Base shear 204k (X) 425.5k (Y) Structural Depth Study Senior Thesis Presentation

  20. New Proposed Lateral System Layout Structural Depth Study Senior Thesis Presentation

  21. X Direction Braced Frames Beams similar sizes (W21s & W24s) Cross brace members increased from W12s to W21s Columns decreased from W14s w/a depth of 17” to W12s w/a depth of 12” Structural Depth Study Senior Thesis Presentation

  22. Y Direction Braced Frames Beams decreased from W21s to W14s Brace members remained W12s with slight decrease in depth Columns decreased from W14s w/a depth of 17” to W12s w/a depth of 12” Structural Depth Study Senior Thesis Presentation

  23. Drift Limit H/400=2.58” Maximum deflection =1.29” Maximum story drift =0.96” Structural Depth Study Senior Thesis Presentation

  24. 3D Framing Model Structural Depth Study Senior Thesis Presentation

  25. Construction Management Breadth Study Office Building B Senior Thesis Presentation

  26. Savings From Eliminating Moment Connections Savings = $115,695 65.6% CM Breadth Study Senior Thesis Presentation

  27. Additional Benefit of Eliminating Moment Connections Calculated man hours to fabricate moment connections =358 man hrs. (RSMeans) 358 man hours converts to 15 days Time to erect steel frame reduced by 15 days CM Breadth Study Senior Thesis Presentation

  28. Architectural Security Breadth Study Office Building B Senior Thesis Presentation

  29. Reason of Interest Washington, D.C. prime target for terrorist attacks Blast design may be required by code in future Nearby structures will also be affected Architectural Study Senior Thesis Presentation

  30. Existing Site 3 entrance points Parking close by Architectural Study Senior Thesis Presentation

  31. New Site Security checks Elimination of entrance Concrete posts along roadway Separate structure for deliveries Architectural Study Senior Thesis Presentation

  32. Proposed Lateral System To save 65.6% 15 day reduction in schedule No changes to floor plan or architecture Architectural Security Plan Tighter security lowers chance of blast Does not interfere with existing site plan Conclusions Senior Thesis Presentation

  33. AE Faculty Fellow Students John A. Martin & Associates Starbucks Acknowledgements Senior Thesis Presentation

  34. Questions Senior Thesis Presentation

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