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Structural Options for The Duncan Center - Senior Thesis Presentation

This presentation outlines the proposed changes to the existing steel structural system of The Duncan Center in Dover, Delaware. The proposed option involves the use of two-way flat plate slabs to replace the existing framing system, resulting in cost and schedule reductions, improved acoustics, and increased mechanical cavity space. The presentation also compares the cost, schedule, and acoustic performance of the existing and proposed systems.

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Structural Options for The Duncan Center - Senior Thesis Presentation

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  1. THEDUNCANCENTER DOVER,DELAWARE RACHELGINGERICH, STRUCTURAL OPTION SENIOR THESIS PRESENTATION APRIL 15, 2008

  2. PRESENTATION OUTLINE A. Building Introduction B. Existing Steel Structural System C. Proposal Introduction D. Depth/Proposed Concrete Structural System E. Construction Management Breadth F. Acoustics Breadth G. Proposal Recommendation RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  3. BUILDING STATISTICS Location: Dover, Delaware Area: 76, 557 SF Height: 93’-0” Stories: 6 total • Floor to floor height of 14’-0” • 5 floors and a penthouse on the top floor • Balconies on 4th and 5th floors Personal Photo: Taken August 16, 2007 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  4. BUILDING STATISTICS Floor Occupancies • 1st-4th Floor: Open Flex Office Spaces • 5th Floor: “The Outlook Center” Ballroom • 6th Floor: Management Offices Mechanical Rooms • Basement: Mechanical Room Electrical Room Personal Photo: Taken August 16, 2007 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  5. BUILDING CONSTRUCTION Overall Project Cost: $10.7 million Additional Tenant Fit-Out Cost: $46,000 Construction Start Date: June 2003 Construction End Date: June 2004 Project Delivery Method: Design-Build Photo by Jackson Architects: Taken July 23, 2003 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  6. EXISTING FRAMING SYSTEM • 5” concrete on 2” composite metal deck • 24’x27’ typical bays of composite beams and girders RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  7. EXISTING LATERAL SYSTEM • Steel Moment Frames • Flange welded/web bolted connections Personal Photo: Taken August 16, 2007 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  8. EXISTING LATERAL SYSTEM North-South Direction Line 4 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  9. EXISTING ROOF FRAMING SYSTEM • Cold formed roof trusses spaced @ 24” o.c. • 1-1/2” metal roof deck RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  10. EXISTING FOUNDATION SYSTEM • 16” dia. augercast piles with pile caps; 85 ton compressive capacity • 24”x24” concrete piers RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  11. REASONS FOR PROPOSAL • Two-way flat plate slab found to be comparative to existing in Technical Assignment #2 • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space • Reduce cost • Reduce Schedule • Improve acoustics for ballroom • Improve acoustics for floors adjacent to the ballroom RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  12. REASONS FOR PROPOSAL • Two-way flat plate slab found to be comparative to existing in Technical Assignment #2 • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space • Reduce cost • Reduce Schedule • Improve acoustics for ballroom • Improve acoustics for floors adjacent to the ballroom Change Structural System to Concrete RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  13. REASONS FOR PROPOSAL • Two-way flat plate slab found to be comparative to existing in Technical Assignment #2 • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space • Reduce cost • Reduce Schedule • Improve acoustics for ballroom • Improve acoustics for floors adjacent to the ballroom Change Structural System to Concrete Compare Cost & Schedule of Existing vs. Proposed RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  14. REASONS FOR PROPOSAL • Two-way flat plate slab found to be comparative to existing in Technical Assignment #2 • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space • Reduce cost • Reduce Schedule • Improve acoustics for ballroom • Improve acoustics for floors adjacent to the ballroom Change Structural System to Concrete Compare Cost & Schedule of Existing vs. Proposed Compare Acoustic Performance of Existing vs. Proposed RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  15. PROPOSED FRAMING SYSTEM • 1st-4th Floors: 12” two-way flat slab; #5 spaced @ 12” o.c. each way • 5th Floor: 14” two-way flat slab; #5 spaced @ 10” o.c. each way RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  16. PROPOSED FRAMING SYSTEM • 6th Floor: 12” one-way slab with beams; #5 spaced @ 9” o.c. each way RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  17. PROPOSED LATERAL SYSTEM • Shear walls replace existing North and South masonry stair towers • 8” thick shear walls with #4 spaced @ 12” o.c. vertical & #4 spaced @ 10” o.c. horizontal Personal Photo: Taken August 16, 2007 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  18. PROPOSED LATERAL SYSTEM East-West Direction Line A RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  19. PROPOSED LATERAL SYSTEM East-West Direction Line A7 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  20. PROPOSED LATERAL SYSTEM North-South Direction Line 4 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  21. PROPOSED ROOF FRAMING SYSTEM • Light steel framing with open web steel joists • 1-1/2” metal roof deck RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  22. PROPOSED FOUNDATION SYSTEM • Pile cap configurations controlled by geometry RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  23. PROPOSED FOUNDATION SYSTEM • 18” dia. augercast piles with pile caps; 105 ton compressive capacity • Columns connect directly to pile caps RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  24. DEPTH CONCLUSIONS Mechanical Cavity Space Comparison RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  25. DEPTH CONCLUSIONS • Foundations not as dramatically affected as expected • Moment connections eliminated • Reduced fireproofing, but did not eliminate • Increased mechanical cavity space RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  26. COST COMPARISON Existing System Cost RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  27. COST COMPARISON Proposed System Cost RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  28. COST COMPARISON Existing vs. Proposed Cost Comparison Reduction of Cost by 20% RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  29. SCHEDULE COMPARISON Existing System Schedule Personal Photo: Taken August 16, 2007 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  30. SCHEDULE COMPARISON Proposed System Schedule Personal Photo: Taken August 16, 2007 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  31. SCHEDULE COMPARISON Existing vs. Proposed Schedule Comparison Increase of Schedule by 6 months RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  32. REVERBERATION TIME COMPARISON Existing System Half Occupancy Reverberation Time Existing System Full Occupancy Reverberation Time RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  33. REVERBERATION TIME COMPARISON Proposed System Half Occupancy Reverberation Time Proposed System Full Occupancy Reverberation Time RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  34. REVERBERATION TIME COMPARISON Existing vs. Proposed System Reverberation Time Comparison (based upon full occupancy) Increased Reverberation Time RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  35. SOUND TRANSMISSION COMPARISON Existing System Sound Transmission Class Personal Photo: Taken August 16, 2007 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  36. SOUND TRANSMISSION COMPARISON Proposed System Sound Transmission Class Personal Photo: Taken August 16, 2007 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  37. SOUND TRANSMISSION COMPARISON Existing vs. Proposed System Sound Transmission Class (based upon 5th floor) Increase of Sound Transmission Class by 60 RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  38. SUCCESSOF PROPOSAL • Eliminate moment connections R RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  39. SUCCESSOF PROPOSAL • Eliminate moment connections • Eliminate fireproofing R T RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  40. SUCCESSOF PROPOSAL • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space R T R RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  41. SUCCESSOF PROPOSAL • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space • Reduce cost R T R R RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  42. SUCCESSOF PROPOSAL • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space • Reduce cost • Reduce Schedule R T R R T RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  43. SUCCESSOF PROPOSAL • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space • Reduce cost • Reduce Schedule • Improve acoustics for ballroom R T R R T R RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  44. SUCCESSOF PROPOSAL • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space • Reduce cost • Reduce Schedule • Improve acoustics for ballroom • Improve acoustics for floors adjacent to the ballroom R T R R T R R RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  45. SUCCESSOF PROPOSAL • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space • Reduce cost • Reduce Schedule • Improve acoustics for ballroom • Improve acoustics for floors adjacent to the ballroom R T R R T R R RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  46. SUCCESSOF PROPOSAL • Eliminate moment connections • Eliminate fireproofing • Increase mechanical cavity space • Reduce cost • Reduce Schedule • Improve acoustics for ballroom • Improve acoustics for floors adjacent to the ballroom R T R R T R R Proposed system not recommended due to increase in schedule. RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  47. THANK YOU & CREDITS Owner & General Contractor: Bob Duncan & all The Duncan Center team Structural Engineer: Baker, Ingram & Associates Architect: Jackson Architects Penn State Architectural Engineering Faculty RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

  48. QUESTIONS? RACHEL GINGERICH STRUCTURAL OPTION APRIL 15, 2008 THE DUNCAN CENTER DOVER, DELAWARE

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