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Redesigning Lateral Systems for The Del Monte Center: A Structural Analysis

This senior thesis presentation delves into the redesign of the lateral system for The Del Monte Center at North Shore in Pittsburgh, covering project overview, depth and breadth studies, construction management, mechanical aspects, and conclusions.

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Redesigning Lateral Systems for The Del Monte Center: A Structural Analysis

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  1. Traci Peterson Structural Option Senior Thesis Presentation The Del Monte Center at The North Shore The Pennsylvania State University Department of Architectural Engineering Spring 2005

  2. Outline of Presentation • Project overview • Depth Study • Redesign of lateral system • Architecture • Breadth Study • Construction management • Mechanical • Conclusions

  3. The Del Monte Center at The North Shore 375 North Shore Drive, Pittsburgh, PA

  4. Project Overview Pittsburgh's North Shore Location of Building

  5. Project Overview • Building Statistics • Dates of Construction • Occupancy/Function • Size • Cost

  6. Project Overview • Project Team • Continental/Nationwide Realty Investors • Strada • Continental Building Systems • Atlantic Engineering Services • Allen & Shariff Corporation • Limbach Facility services

  7. Project Overview • Structural System • Frame • Foundation • Floor System

  8. Project Overview 1” expansion joint

  9. Project Overview • Lateral System • Bracing (North-South Direction): Frame E Location of Bracing: Frame D

  10. Project Overview • Bracing (East-West Direction) Frame E Frame D Frames A & D Frames B & E Frames C & F

  11. Depth Study • Lateral System Redesign • Alternative #1 • Alternative #2 • Exposed bracing • Modified windows

  12. Depth Study • Design Criteria • Codes • Methods

  13. Depth Study • Loads • Dead • Live • Snow • Wind • Seismic • Load combinations • 1.4D • 1.2D+1.6L+0.5S • 1.2D+1.6S+(0.5L or 0.8W) • 1.2D+1.6W+0.5L+0.5S

  14. Depth Study • STAAD.pro 2002 • “Select Optimized” command

  15. Depth Study • Existing System Frames A & D Frames B & E Frames C & F Total Weight of System = 426.7 k

  16. Depth Study • Alternative #1- Moment Frames Frames A & D Frames B & E Frames C & F Total Weight of System = 358.5 k

  17. Depth Study • Alternative #1- Moment Frames • Drift

  18. Depth Study • Alternative #2- Full Bay Bracing Frames A & D Frames B & E Frames C & F Total Weight of System = 200.8 k

  19. Depth Study • Results

  20. Architecture • Alternative #2- chevrons • Modified Windows • Exposed Bracing

  21. Architecture • Alternative #2 with modified windows

  22. Architecture • Alternative #2 with exposed bracing

  23. Architecture

  24. Architecture

  25. Breadth Study • Construction Management Cost of Structural Steel W-shapes:

  26. Breadth Study • Construction Management • Existing beam to column connections • Given: • Bolted double angle • ASTM A325 ¾”  slip-critical bolts • Designed for summation of: • ½ uniform load capacity of member • 10k axial force • Determined: • ¼” angle • 5 rows of bolts • $63 each

  27. Breadth Study • Construction Management • Existing bracing connections • Given: • Bolted/welded shear end-plate connections • Fillet welds • Determined: • 3/16” weld • 2 rows of bolts • $55 each

  28. Breadth Study • Construction Management • Moment connections • Determined: • Single-plate web connection: • 3/8” x 12” • 5 7/8”  bolts • 2 5/16” fillet welds • Tension flange-plate: • 1” x 10-1/4” • 5/16” fillet welds (6” along each side, 10-1/4” along end) • Compression flange-plate: • 13/16” x 12.5” • 5/16” fillet weld (6” along each side) • No doublers or stiffeners required • $250 each

  29. Breadth Study • Construction Management Total Cost of Connections (material, fabrication, & installation):

  30. Breadth Study • Construction Management • Alternative #2, with modified windows Building Envelope Costs (as compared to existing design):

  31. Breadth Study • Construction Management Total Costs:

  32. Breadth Study • Mechanical • Carriers “Hourly Analysis Program 4.2” (HAP) • Mechanical system components • 10 packaged water-cooled air conditioning units • 2 cooling towers (1 for each unit) • 3 hydronic unit heaters • 2 hydronic cabinet unit heaters • 1 electric unit heater • 4 hot water boilers • Current utility rates • Department of Energys website

  33. Breadth Study • Mechanical • Results of HAP analysis: • Annual energy costs savings = $2,856

  34. Conclusions Total Costs: $112,780 - $101,681 = $11,000 $11,000 / ($2,856/year) = 4 years

  35. Conclusions • Existing system is most expensive system studied • Least expensive system to build has chevron braces left exposed • Least expensive system over time has concealed chevron braces • Modifying windows disrupts architectural aesthetics of building • Moment frame system costs less than existing system, & preserves large windows • For moment frame system, recommendation is to increase expansion joint to 2”

  36. Thank You

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