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Matthew Kutzler

Matthew Kutzler. Structural Option Spring 2004. Buildings C and D Campus Square, Lehigh University Bethlehem, PA. Campus Square – Buildings C and D. Located at Lehigh University in Bethlehem, PA Complex consists of four dormitories and a parking deck

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Matthew Kutzler

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  1. Matthew Kutzler Structural OptionSpring 2004 Buildings C and D Campus Square, Lehigh University Bethlehem, PA

  2. Campus Square – Buildings C and D • Located at Lehigh University in Bethlehem, PA • Complex consists of four dormitories and a parking deck • Buildings A and D are structurally similar, as well as Buildings B and C

  3. Location

  4. Presentation Contents • Building Overview • Proposal • Breadth: Acoustics • Depth: Structural • Breadth: Construction Management • Conclusions • Acknowledgements • Questions

  5. Building Overview • Project Team • Owner: Lehigh University • Architect: Bohlin Cywinski Jackson • Mechanical/Plumbing/Electrical: Brinjac Engineering,Inc. • Civil and Structural: Barry Isett & Associates • Construction Management: Alvin H. Butz

  6. Building Overview • Statistics • Function: residential and retail • Zoning: building height limited to 70 ft • Total cost: $23 million • Building C: • 49,565 sq ft (multipurpose - 18,010 sq ft) • Floors 1-2: campus bookstore; 3-5: apartments • Building D: • 30,654 sq ft • Floors 1-3: apartments

  7. Building Overview • Architecture • 250 beds in double, triple, and quad apartments • Floor-to-ceiling height is 8’ • Red brick face • Aluminum storefront framing

  8. Building Overview • Floor Plan

  9. Building Overview • Structural – Gravity • Building C: • Steel frame on floors 1-3 • Load bearing masonry walls on floors 4-5 • 8” precast hollow core plank • Typical bays are 20’ x 20’

  10. Building Overview

  11. Building Overview • Structural – Gravity • Building D: • Load bearing masonry walls • 8” precast hollow core plank

  12. Building Overview • Structural • Foundations: • Continuous strip footings along the perimeter • Interior spread and combined footings • Lateral: • 8” concrete masonry shear walls

  13. Presentation Contents • Building Overview • Proposal • Breadth: Acoustics • Depth: Structural • Breadth: Construction Management • Conclusions • Acknowledgements • Questions

  14. Criteria to maintain Floor-to-ceiling height Current floor plan Architectural scheme Proposal • Goals • Framing • Foundations • Lateral system • Vibration • Fire Protection • Acoustics • Construction Management

  15. Presentation Contents • Building Overview • Proposal • Breadth: Acoustics • Depth: Structural • Breadth: Construction Management • Conclusions • Acknowledgements • Questions

  16. BOCA requires an STC and IIC of 45 Current STC Precast plank: 58 Masonry walls and partitions: 52 Current IIC Precast plank: 50 Dictates slab thickness of proposed systems 4” slab: STC= 44 IIC = 25 Acoustics

  17. Acoustics • Solution • STC rating of 60 • IIC of 59 • Floorboard reduces airborne and impact noise

  18. Presentation Contents • Building Overview • Proposal • Breadth: Acoustics • Depth: Structural • Breadth: Construction Management • Conclusions • Acknowledgements • Questions

  19. Slab 4 ksi normal weight concrete 3.5” (1 hour fire rating) #3 @ 12” o.c. Joists 40” pans 12” x 8” 2 - #6 top and bottom #3 @ 12” o.c. for shear Structural – Pan Joist System

  20. Structural – Pan Joist System

  21. Structural – Pan Joist System • Columns • A: 20’ x 10’ … exterior • B: 20’ x 13’ … corridor • C: 20’ x 20’ … interior, other than the corridor • 18” x 18” • 4 - #9’s

  22. Structural – Pan Joist System

  23. Lateral Shear walls removed Total drift: 0.515” < 1.53” Vibration No calculation needed Fire Protection - 3.5” slab is adequate for one-hour fire rating Structural – Pan Joist System

  24. Slab 3 ksi normal weight concrete 4” slab on 24 gage UFS form deck 44 – W4.0 x 4.0 welded wire fabric Joists Apartments: 18K3 @ 2’-10” Corridors: 16K3 @ 3’-0” Structural – Steel Joist System

  25. Beams and Girders Perimeter: W16 x 31 Corridor: W16 x 31 Other beams: W12 x 19 Other girders: W16 x 31 and W18 x 35 Columns W12 x 72 Structural – Steel Joist System

  26. Structural – Steel Joist System < Bay 1 Bay 2 >

  27. Structural – Steel Joist System

  28. Structural – Steel Joist System Existing Proposed

  29. Structural – Steel Joist System • Vibration • AISC criteria • Apartment and corridor bays analyzed • Passed walking excitation criteria • Frequency was below 9 Hz so no floor stiffness check required

  30. Structural – Steel Joist System • Fire Protection • Steel joists: max spacing of 48” o.c. • Bridging: 1/2” diameter bars • Ceiling: Acoustical material or gypsum board • Design No. G205

  31. Presentation Contents • Building Overview • Proposal • Breadth: Acoustics • Depth: Structural • Breadth: Construction Management • Conclusions • Acknowledgements • Questions

  32. Construction Management • Cost Comparison • Framing • Floors • Formwork

  33. Presentation Contents • Building Overview • Proposal • Breadth: Acoustics • Depth: Structural • Breadth: Construction Management • Conclusions • Acknowledgements • Questions

  34. Conclusions

  35. Barry Isett & Associates Ross Sotak Jeff Thoms Alvin H. Butz Lehigh University Tony Corallo AE Faculty AE Classmates Family and friends Acknowledgements

  36. Questions?

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