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Structural Option for Duquesne University Multipurpose Facility

This presentation outlines the proposed analysis, structural depth study, and redesign of the lateral and gravity systems for the Duquesne University Multipurpose Facility. It also includes breadth studies on acoustics and construction cost comparison. Conclusions and recommendations are provided.

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Structural Option for Duquesne University Multipurpose Facility

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  1. Duquesne University Forbes Expansion The Pennsylvania State University Spring Semester 2007 Michael Szott Structural Option Senior Thesis Presentation Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  2. PresentationOutline • Introduction • Proposed Analysis • Structural Depth Study • Lateral system redesign • Gravity system redesign • Breadth Studies • Acoustics • Construction cost comparison • Conclusions and Recommendations Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  3. Location Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  4. Location Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  5. Project Overview • Project Team • Duquesne University • DRS Architects • Jendoco Construction • Atlantic Engineering Services • Dodson Engineering • Hornfeck Electrical Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  6. Project Overview • Building Statistics • Construction dates • March 2006 – December 2007/January2008 • Building occupancy • Mixed Use – retail, student fitness, office, entertainment • Building size • 7 stories – 125,000 sq. ft. • Project cost • $24 million Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  7. Project Overview • Existing Structural System • Gravity system • Composite steel construction • Lateral system • Concentrically braced frames • Foundations • Auger cast piles • Grade Beams Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  8. Project Overview Typical – Floors 1-3 Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  9. Project Overview Long Span Framing, Floors 4-5 Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  10. Proposed Analysis • Lateral Resisting System • More efficient bracing scheme? • Gravity System – Vibration Analysis • Intermixed activity spaces • Long span conditions • Interior Acoustical Performance • Impact on Construction Cost Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  11. Structural Depth: Lateral Redesign Lateral Bracing Locations Typical Frame Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  12. Structural Depth: Lateral Redesign • Three Alternate Bracing Schemes • Modified concentric bracing • Chevron bracing • Alternating diagonals (K-bracing) Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  13. Design Criteria IBC 2003 ASCE 7-02 Applied Loads Dead Live Snow Wind Seismic Structural Depth: Lateral Redesign IBC2003 section 1616.6 : “analysis must be performed except when structures are assigned to Seismic Design Category A” Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  14. Structural Depth: Lateral Redesign • Individual Frames: RAM Advanse • Optimization • Minimal Weight • Member check • Local Buckling • Overall System: RAM Frame • Drift check Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  15. Structural Depth: Lateral Redesign Modified – Tension/Compression Chevron Bracing “K” Bracing Existing - Tension Only LC: DL+0.75LL+0.75W Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  16. Existing Frame Design HSS 6x4x1/4 – 8x4x5/8 Columns: W14x53 – 132 Beams: W33x118 Modified Ten. – Comp. HSS 4x3x1/4 – 9x7x1/4 Columns: W14x53 – 211 Beams: W33x118 Chevron Bracing HSS 4x3x1/4 – 10x8x3/8 Columns: W14x53 – 211 Beams: W24x76 “K” Bracing HSS 4x3x1/4 – 12x10x1/2 Columns: W10x45 – W24x131 Beams: W33x118 Structural Depth: Lateral Redesign Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  17. Chevron Bracing Least weight of all systems Smallest frame beams Controlling deflection limits – L/600 or 0.3” Structural Depth: Lateral Redesign Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  18. Drift at High Roof Level Drift at Intermediate Roof Level Drift at 5th Floor Level Pedestrian bridge Overall Building Drift (in.) Bracing Layout Drift @ HR Drift @ IR Drift @ 5th H/400 Existing 5.6 3.3 2.1 3.96 X-Bracing (T/C) 4.6 2.6 1.5 3.96 Chevron Bracing 4.8 2.7 1.5 3.96 K-Bracing 5 2.9 1.6 3.96 Structural Depth: Lateral Redesign Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  19. Structural Depth: Gravity Redesign • Vibration Design: AISC Design Guide 11 • Floor vibrations due to human activity • Criteria based on rhythmic activity • Aerobics • Dining and Dancing • Serviceability issue – not strength • Design to avoid personal discomfort Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  20. Structural Depth: Gravity Redesign • Four Critical Spaces Analyzed • 2nd floor Aerobic/Fitness areas • 3rd floor gymnasium (typical bays) • 4th floor gymnasium (long spans) • 5th floor ballroom (long spans) • Designed for partially loaded bays • Modified constant “k” used Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  21. Structural Depth: Gravity Redesign Acceleration Limits • Dancing/Dining 0.02g • Aerobics only 0.06g • Gymnasium 0.10g-0.15g (i.e. basketball, etc…) Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  22. Structural Depth: Gravity Redesign Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  23. Structural Depth: Gravity Redesign • Existing Fitness Framing • 20’8” span • Beams: W12x16 @ 7’ o.c. • Girders: W16x31 (21’0”) • 31’4” span • Beams: W18x40 @ 7’ o.c. • Girders: W18x35 (21’0”) Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  24. Structural Depth: Gravity Redesign • New Fitness Framing • 31’4” span • Beams: W21x83 @ 7’ o.c. • Girders: W21x83 (21’0”) Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  25. Structural Depth: Gravity Redesign Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  26. Structural Depth: Gravity Redesign • Existing Ballroom Framing • 79’6” span • Beams: W36x210 @ 7’ o.c. • Girders: W27x84 (21’0”) • Criteria not met Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  27. Structural Depth: Gravity Redesign • Ballroom Redesign • Departure from Design Guide 11 • Partial loading vs. Fully loaded bays Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  28. Structural Depth: Gravity Redesign • New Ballroom Framing • Conventional • Beams: W40x372 @ 7’ o.c. • Girders: W30x90 (21’0”) • Castellated Beams • Modified wide flange sections • Lighter and more stiff • Economical Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  29. Structural Depth: Gravity Redesign • Castellated Ballroom Framing • 79’6” span • Beams: CB50x221 @ 7’ o.c. • Girders: W27x84 (21’0”) Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  30. Structural Depth: Gravity Redesign • Overall Effects of New Framing • Lighter gravity system • Reduced clear height in both gym spaces • Improved vibrational performance • Cost? Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  31. Castellated Sections Less material, reduced material cost 2 man hours to convert from wide flange to castellated “…in general, spans longer than 40’ can recoup these costs.” - Billy Milligan, VP of CMC Steel Products Delivery From Hope, AR Distance: 1015 miles Cost: $65,500 Breadth Study: Construction Cost Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  32. Breadth Study: Construction Cost • Material savings, greater than fabrication costs • Delivery costs drive more expensive system Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  33. Breadth Study: Construction Cost • Lateral Frames • Structural tubing more expensive than wide flange sections • Fabrication and connection costs • Chevrons bracing: least material = least cost • Frame beams considerably smaller Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  34. Conclusions and Recommendations • A chevron bracing scheme offers a reduction in weight and material • Redesigning the lateral system will save on material costs • Castellated beams improve floor vibrations and decrease floor weight over long spans • Gravity system costs increase slightly • Suggested improvements are cost feasible Michael J. Szott Structural Option Duquesne University Multipurpose Facility

  35. Questions?? ?? Michael J. Szott Structural Option Duquesne University Multipurpose Facility

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