Christopher McCune Structural Option 2006 Senior Thesis Penn State Architectural Engineering Eight Tower Bridge Conshohocken, Pennsylvania
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Presentation Outline Outline Project • Project Background • Structural Design Background • Project History • Gravity System Original • Architectural Description • Lateral System Structure Proposal • Original Structure • Construction Management Structural Design • System Description • Cost Analysis • Problem Development • Schedule Comparison Construction Management • Final Conclusions • Proposal Final Conclusions • Design Objectives Questions • Design Criteria • Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction � Outline Project Background Original Structure Project Background Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Project Background � Outline Basic Information Project • Conshohocken, Pennsylvania Background • historic area Original • 16 stories+ mechanical penthouse Structure • 345,000 square feet Proposal • Constructed from February 2001 to April 2002 Structural Design • $43 million total project cost Construction Key Players Management • Owners: Oliver Tyrone Pulver Corporation Final Conclusions & Brandywine Realty Trust Questions • Architect: Skidmore, Owings & Merrill • Structural Engineers: Skidmore, Owings & Merrill • Mechanical Engineers: Jaros, Baum & Bolles • Steel Contractor: Grossi & Sons Steel • General Contractor: R.M. Shoemaker
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Project Background � Outline Project History Project • Building is part of a series of similar office projects Background • Oliver Tyrone Pulver has worked with both SOM and Jaros, Baum & Bolles before Original Structure Description Proposal • Multi-tenant office tower Structural Design • Open office floor plan, central core construction • 21,500 square feet/floor Construction Management • Ground level doubles as entry and parking area Final Conclusions Architecture Questions • Features two story entry lobby • Façade is “signature” precast concrete panel with stone trim and tinted green glass • Corner terraces located on 16 th floor
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction � Outline � Project Background Original Structure Original Structure Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Foundation � Outline • 4000psi 16” diameter auger cast piles with caps � Project • 4’3” mat foundation at core Background • Connected by various size grade beams Original Structure Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Floor System � Outline Typical Floor Layout � Project Background Floors 4-14 designed as typical Original Structure Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Floor System � Outline Typical Bay Plan � Project • Bay Size: 28’ x 44’4” Background • Beams: W18x40 spaced @ 9’4” Original • Interior Girders: W18x50/86 Structure • Exterior Girders: W21x44 Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Floor System � Outline Flooring System � Project • Floor beams act in full composite with slab Background • ASTM 992, Grade 50 W18x40 beams, 1¾” upward camber Original • 3¼” lightweight concrete slab over 2” metal deck with ¾” shear studs Structure Total System depth: 23¼” Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Columns � Outline Columns � Project • W14 shapes ranging from 550lbs/ft to 90 lbs/ft Background • Designed for floor to floor height of 12’1”, spanning two stories Original Structure Proposal Floor to ceiling height: 9’0” Structural Design • 23¼” floor system depth Construction • 13¾” mechanical plenum space Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Lateral System � Outline • Combination of braced and moment frames � Project • Braced frames found at core of building Background • Moment frames found at building perimeter Original Structure Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Original System � Outline • 3D rendering of steel frame � Project Background Original Structure Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Problem Development � Outline • Eight Tower Bridge has been designed and built as a � Project steel structure Background • Steel is a popular material for office buildings in the Original Philadelphia area Structure • Most engineers will consider multiple designs Proposal Structural Design COULD THIS BUILDING BE DESINGED AS Construction A CONCRETE STRUCTURE? Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction � Outline � Project Background � Original Structure Proposal Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Proposal � Outline Design an alternate concrete structural system with the � Project following objectives: Background • Maintain an open office layout, free of column obstruction � Original • Maintain an overall floor system depth less than or equal Structure to the existing 23¼” depth Proposal • Limit floor deflection to l/360 Structural Design • Limit lateral building drift to l/400 Construction • Minimize cost and schedule Management Final Conclusions Questions Design the system under the following criteria and codes • IBC 2000 • ASCE7-2002 • ACI 318-05
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction � Outline � Project Background � Original Structure Structural Design � Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Where to begin? � Outline Floor system controls design � Project • Floor weight determines column size Background • Floor to floor height can affect lateral system � Original Structure Concrete options? � Proposal • Two-way flat plate Structural • Two-way flat plate with drop panels Design • Regular reinforced beams (T-beam) • Post-tensioned system Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Floor System Design � Outline Two alternate concrete floor systems were designed � Project Background System #1: One-way post-tensioned beam and slab � Original • Post-tensioning in beams only Structure • 6” regular reinforced concrete slab • 20”x20” typical beams spaced 14’ o.c. (22x20 long span girders) � Proposal • 5000 psi concrete Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction System #1- PT Beam and Slab � Outline Longitude tendon plan � Project • ½”-7-wire tendons used Background • Tendons stressed to 26.6kips/tendon (includes losses) � Original Structure � Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction System #1- PT Beam and Slab � Outline � Project Background � Original Structure � Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction System #2- PT Beam and Slab � Outline System #2: One-way post-tensioned beam and post-tensioned slab � Project • 6” post tensioned concrete slab with 4 tendons @ 6’ o.c Background • 18”x30” typical beams spaced 28’ o.c. � Original • 5000 psi concrete Structure � Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction System #2- PT Beam and Slab � Outline � Project Background � Original Structure � Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Deflection Calculations � Outline RAM Conc ept sustained service load deflection plan for system #2 � Project Background � Original Structure � Proposal Structural Design Construction Management Final Conclusions Questions
Eight Tower Bridge Conshohocken, Pennsylvania � Introduction Floor System Summary � Outline � Project Background � Original Structure � Proposal Structural Design Construction Management Final Conclusions Questions
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