Falls Church Tower Structural Falls Church, VA Dr. Mem ari 1 - PowerPoint PPT Presentation

4/13/2011 Nathan Eck Falls Church Tower Structural Falls Church, VA Dr. Mem ari 1

4/13/2011 Presentation Overview About Falls Church Tower Thesis Objectives Depth Study Alternative Lateral Fram ing System Breadth # 1 Architectural Im pact Breadth # 2 Cost and Schedule Analysis Conclusion Acknowledgem ents 2

4/13/2011 About Falls Church Tower About Falls Church Tower Thesis Objectives Project Team Depth Study Owner: Sunburst Hospitality Equity Residential Alternative Lateral Fram ing System Structural Engineer: SK&A Group Breadth # 1 Architect: WDG Architecture General Contractor: Donohoe Construction Com pany Architectural Im pact Building Inform ation Breadth # 2 Location: Falls Church, VA Cost and Schedule Analysis Size: 536,0 0 0 SF Occupancy Type: Residential Conclusion Total Cost: $92,0 0 0 ,0 0 0 Acknowledgem ents 3

4/13/2011 About Falls Church Tower About Falls Church Tower Thesis Objectives Depth Study Alternative Lateral Fram ing System Architecture Breadth # 1 11 Stories + Penthouse Architectural Im pact 3 ½ Levels of Undeground Parking Brick façade with concrete and glazing elem ents Breadth # 2 private pool across from the plaza Cost and Schedule Analysis Conclusion Acknowledgem ents 4

4/13/2011 Thesis Objectives About Falls Church Tower Thesis Objectives Depth Study Project Goals Structural Depth Alternative Lateral Fram ing System • Im prove Lateral Fram ing System • Originally an ordinary concrete moment Breadth # 1 • Decrease the weight of the building frame with post tensioned slab Architectural Im pact • Reduce the cost and schedule of the fram ing • Irregular column layout system Breadth # 2 • Minim ize the im pact on the architecture Proposal Cost and Schedule Analysis • In corporation of a shear wall system Conclusion • Reduction in column sizes throughout building Acknowledgem ents 5

4/13/2011 Thesis Objectives About Falls Church Tower Thesis Objectives Depth Study Project Goals Architectural Breadth Alternative Lateral Fram ing System • • Redesign column layout Im prove Lateral Fram ing System Breadth # 1 • Modification of floor plan and façade elements • Decrease the weight of the building Architectural Im pact • Reduce the cost and schedule of the fram ing system Breadth # 2 • Minim ize the im pact on the architecture Cost and Scheduling Breadth Cost and Schedule Analysis • Compare validity of existing and alternative Conclusion structural systems Acknowledgem ents 6

4/13/2011 Depth Study About Falls Church Tower Thesis Objectives Existing Gravity System Depth Study Alternative Lateral Fram ing System • 7” thick post-tensioned slab Breadth # 1 • 2-3 strand tendons Architectural Im pact • Tendons spaced 5’ on center Breadth # 2 • Irregular array of colum ns Cost and Schedule Analysis • Range of sizes Conclusion • Typical 25’x25’ bays Acknowledgem ents 7

4/13/2011 Depth Study About Falls Church Tower Thesis Objectives Existing Lateral System Depth Study Alternative Lateral Fram ing System • Colum ns uniquely oriented to Breadth # 1 reduce lateral displacem ent in both Architectural Im pact directions Breadth # 2 • Range in colum n sizes m eant to Cost and Schedule Analysis resist lateral loads as m uch as Conclusion Acknowledgem ents gravity loads 8

4/13/2011 Depth Study About Falls Church Tower Thesis Objectives Existing Fram e Analysis Depth Study Alternative Lateral Fram ing System • Wind Shear = 957 K Breadth # 1 • Seism ic Shear = 1933 K Architectural Im pact Breadth # 2 • Seism ic Conctrols Cost and Schedule Analysis Conclusion Acknowledgem ents 9

4/13/2011 Depth Study About Falls Church Tower Thesis Objectives ETABS Model Depth Study Alternative Lateral Fram ing System • Originally m odeled in AutoCAD Breadth # 1 • Transferred to ETABS Architectural Im pact • Diaphragm s were assum ed to be Breadth # 2 rigid Cost and Schedule Analysis • All seism ic forces were applied at Conclusion center of m ass Acknowledgem ents • All colum n were fixed at both ends 10

4/13/2011 Depth Study About Falls Church Tower Thesis Objectives Colum n Design Depth Study Alternative Lateral Fram ing System • Sized colum ns based on the new layout Breadth # 1 • Tributary areas determ ined in AutoCAD • 3 typical colum n types Architectural Im pact • Interior Colum n Breadth # 2 • “Large Area” Interior Colum n Cost and Schedule Analysis • Exterior Conclusion Acknowledgem ents 11

4/13/2011 Depth Study About Falls Church Tower Thesis Objectives Shear Wall Design Criteria Depth Study Alternative Lateral Fram ing System • Locate walls around elevator shafts Breadth # 1 and stairwells Architectural Im pact • Multiple layouts Breadth # 2 Cost and Schedule Analysis Conclusion Acknowledgem ents 12

4/13/2011 Shear Wall Layouts Depth Study About Falls Church Tower Thesis Objectives Depth Study Alternative Lateral Fram ing System Breadth # 1 Architectural Im pact Breadth # 2 Cost and Schedule Analysis Conclusion Acknowledgem ents 13

4/13/2011 Shear Wall Layouts Depth Study About Falls Church Tower Thesis Objectives Depth Study Alternative Lateral Fram ing System Breadth # 1 Architectural Im pact Breadth # 2 Cost and Schedule Analysis Conclusion Acknowledgem ents 14

4/13/2011 Depth Study About Falls Church Tower Thesis Objectives Layout 5 Depth Study Alternative Lateral Fram ing System • Capable of reducing drift to values Breadth # 1 less than the existing fram e Architectural Im pact Breadth # 2 Cost and Schedule Analysis Conclusion Acknowledgem ents 15

4/13/2011 Depth Study About Falls Church Tower Thesis Objectives Seismic Story Drift of Existing Structure Seismic Story Drift of Revised Structure Floor Y (in) X (in) Total Y Total X Floor Y (in) X (in) Total Y Total X Depth Study Pent. Roof 0.065 0.014 0.065 0.014 Pent. Roof 0.052 0.088 0.052 0.013 Mech. Roof 0.093 0.014 0.158 0.028 Mech. Roof 0.057 0.052 0.108 0.025 Alternative Lateral Fram ing System Main Roof 0.098 0.017 0.256 0.045 Main Roof 0.059 0.094 0.167 0.037 Breadth # 1 11 0.099 0.019 0.356 0.064 11 0.060 0.099 0.228 0.047 10 0.098 0.019 0.454 0.083 10 0.060 0.099 0.288 0.055 Architectural Im pact 9 0.096 0.019 0.550 0.102 9 0.059 0.097 0.346 0.061 Breadth # 2 8 0.092 0.018 0.642 0.120 8 0.057 0.095 0.403 0.065 7 0.086 0.017 0.729 0.137 7 0.053 0.089 0.457 0.068 Cost and Schedule Analysis 6 0.078 0.015 0.806 0.153 6 0.048 0.081 0.505 0.072 Conclusion 5 0.066 0.013 0.872 0.166 5 0.041 0.070 0.546 0.075 Acknowledgem ents 4 0.052 0.011 0.924 0.177 4 0.033 0.055 0.579 0.078 3 0.036 0.008 0.960 0.184 3 0.022 0.037 0.601 0.081 2 0.013 0.003 0.973 0.187 2 0.009 0.015 0.610 0.082 16

4/13/2011 Depth Study About Falls Church Tower Thesis Objectives Shear Wall Design Depth Study • Layout 5 was m odeled in ETABS Alternative Lateral Fram ing System • New seism ic load was determ ined Breadth # 1 • Analysis was run to determ ine the Architectural Im pact stresses in the shear wall Breadth # 2 • Strength checks were perform ed Cost and Schedule Analysis and the wall strength verified Conclusion Acknowledgem ents 17

4/13/2011 Architectural Breadth About Falls Church Tower Thesis Objectives Goals Depth Study • Revise the existing colum n layout to Alternative Lateral Fram ing System a definable grid Breadth # 1 • Reduce the im pact in the floor plan Architectural Im pact and facade Breadth # 2 Cost and Schedule Analysis Conclusion Acknowledgem ents 18

4/13/2011 Architectural Breadth About Falls Church Tower Thesis Objectives Colum n Layout Depth Study • Adheres to two different grids Alternative Lateral Fram ing System Radial Breadth # 1 Rectangular Architectural Im pact • Reduces the num ber of colum ns per Breadth # 2 floor Cost and Schedule Analysis Conclusion Acknowledgem ents 19

4/13/2011 Architectural Breadth About Falls Church Tower Thesis Objectives Colum n Layout Depth Study • Only m inor changes in floor plan Alternative Lateral Fram ing System • Slight partition shifts Breadth # 1 • Balcony shift Architectural Im pact Breadth # 2 Cost and Schedule Analysis Conclusion Acknowledgem ents 20

4/13/2011 Architectural Breadth About Falls Church Tower Thesis Objectives Colum n Layout Depth Study • Effect on Facade Alternative Lateral Fram ing System • Glazed façade on south face of the Breadth # 1 building Architectural Im pact • Originally had 5 colum ns across Breadth # 2 face Cost and Schedule Analysis • Reduced to 4 colum ns Conclusion Acknowledgem ents 21

4/13/2011 Architectural Breadth About Falls Church Tower Thesis Objectives Colum n Layout Depth Study • Effect on Facade Alternative Lateral Fram ing System • Glazed façade on south face of the Breadth # 1 building Architectural Im pact • Originally had 5 colum ns across Breadth # 2 face Cost and Schedule Analysis • Reduced to 4 colum ns Conclusion Acknowledgem ents 22