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

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4/13/2011 1

Falls Church Tower

Falls Church, VA

Nathan Eck Structural

Dr. Mem ari

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Presentation Overview

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

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4/13/2011 3

About Falls Church Tower

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Project Team

Owner: Sunburst Hospitality Equity Residential Structural Engineer: SK&A Group Architect: WDG Architecture General Contractor: Donohoe Construction Com pany

Building Inform ation

Location: Falls Church, VA Size: 536,0 0 0 SF Occupancy Type: Residential Total Cost: $92,0 0 0 ,0 0 0

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About Falls Church Tower

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Architecture

11 Stories + Penthouse 3 ½ Levels of Undeground Parking Brick façade with concrete and glazing elem ents private pool across from the plaza

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Thesis Objectives

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Project Goals

Im prove Lateral Fram ing System
Decrease the weight of the building
Reduce the cost and schedule of the fram ing

system

Minim ize the im pact on the architecture

Structural Depth

Originally an ordinary concrete moment

frame with post tensioned slab

Irregular column layout

Proposal

In corporation of a shear wall system
Reduction in column sizes throughout building

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Thesis Objectives

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Project Goals

Im prove Lateral Fram ing System
Decrease the weight of the building
Reduce the cost and schedule of the fram ing

system

Minim ize the im pact on the architecture

Architectural Breadth

Redesign column layout
Modification of floor plan and façade elements

Cost and Scheduling Breadth

Compare validity of existing and alternative

structural systems

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Existing Gravity System

7” thick post-tensioned slab
2-3 strand tendons
Tendons spaced 5’ on center
Irregular array of colum ns
Range of sizes
Typical 25’x25’ bays

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Existing Lateral System

Colum ns uniquely oriented to

reduce lateral displacem ent in both directions

Range in colum n sizes m eant to

resist lateral loads as m uch as gravity loads

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Existing Fram e Analysis

Wind Shear = 957 K
Seism ic Shear = 1933 K
Seism ic Conctrols

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

ETABS Model

Originally m odeled in AutoCAD
Transferred to ETABS
Diaphragm s were assum ed to be

rigid

All seism ic forces were applied at

center of m ass

All colum n were fixed at both ends

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Colum n Design

Sized colum ns based on the new layout
Tributary areas determ ined in AutoCAD
3 typical colum n types
Interior Colum n
“Large Area” Interior Colum n
Exterior

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Shear Wall Design Criteria

Locate walls around elevator shafts

and stairwells

Multiple layouts

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Shear Wall Layouts

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Shear Wall Layouts

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Layout 5

Capable of reducing drift to values

less than the existing fram e

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Seismic Story Drift of Existing Structure Floor Y (in) X (in) Total Y Total X

Pent. Roof

0.065 0.014 0.065 0.014

Mech. Roof

0.093 0.014 0.158 0.028 Main Roof 0.098 0.017 0.256 0.045 11 0.099 0.019 0.356 0.064 10 0.098 0.019 0.454 0.083 9 0.096 0.019 0.550 0.102 8 0.092 0.018 0.642 0.120 7 0.086 0.017 0.729 0.137 6 0.078 0.015 0.806 0.153 5 0.066 0.013 0.872 0.166 4 0.052 0.011 0.924 0.177 3 0.036 0.008 0.960 0.184 2 0.013 0.003 0.973 0.187 Seismic Story Drift of Revised Structure Floor Y (in) X (in) Total Y Total X

Pent. Roof

0.052 0.088 0.052 0.013

Mech. Roof

0.057 0.052 0.108 0.025 Main Roof 0.059 0.094 0.167 0.037 11 0.060 0.099 0.228 0.047 10 0.060 0.099 0.288 0.055 9 0.059 0.097 0.346 0.061 8 0.057 0.095 0.403 0.065 7 0.053 0.089 0.457 0.068 6 0.048 0.081 0.505 0.072 5 0.041 0.070 0.546 0.075 4 0.033 0.055 0.579 0.078 3 0.022 0.037 0.601 0.081 2 0.009 0.015 0.610 0.082

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Depth Study

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Shear Wall Design

Layout 5 was m odeled in ETABS
New seism ic load was determ ined
Analysis was run to determ ine the

stresses in the shear wall

Strength checks were perform ed

and the wall strength verified

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Architectural Breadth

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Goals

Revise the existing colum n layout to

a definable grid

Reduce the im pact in the floor plan

and facade

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Architectural Breadth

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Colum n Layout

Adheres to two different grids

Radial Rectangular

Reduces the num ber of colum ns per

floor

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Architectural Breadth

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Colum n Layout

Only m inor changes in floor plan
Slight partition shifts
Balcony shift

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Architectural Breadth

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Colum n Layout

Effect on Facade
Glazed façade on south face of the

building

Originally had 5 colum ns across

face

Reduced to 4 colum ns

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Architectural Breadth

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Colum n Layout

Effect on Facade
Glazed façade on south face of the

building

Originally had 5 colum ns across

face

Reduced to 4 colum ns

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Cost and Scheduling

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Goals

Develop estim ates for both the

existing structure and the revised structure

Develop scheduling estim ates for

both the existing structure and the revised structure

Com pare the cost and schedule

estim ates and verify the feasibility

f the revised structure

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Cost and Scheduling

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Cost and Scheduling Process

Determ ine necessary criteria
Materials, form work, steel, etc.
Find unit prices/ hours using RS

Means Costworks

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Cost and Scheduling

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Elem ent Existing Structure Redesigned Structure Columns $1,071,333.38 $535,663.77 Slabs $2,334,217.66 $2,334,574.61 Shear Walls

$386,345.68

Total Tim e $3,4 0 5,551.0 4 $3,256 ,58 4 .0 5 Difference

$14 8 ,9 66 .99

Tim e Required (Days) Elem ent Existing Structure Redesigned Structure Column Formwork 515 243 Column Concrete 15 11 Slab Formwork 617 617 Total Tim e 1,14 7 8 71 Difference

276

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Conclusion

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

Structural

Reduce Size
Incorporate shear walls and reduce

lateral drift Architecture

Reduce the num ber of colum ns and

assign to grid with m inim al im pact on the floor plan Cost and Scheduling

Use cost estim ates to verify the feasibility
f the shear wall system

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Acknowledgem ents

About Falls Church Tower Thesis Objectives Depth Study Breadth # 1

Architectural Im pact Alternative Lateral Fram ing System

Breadth # 2 Acknowledgem ents Conclusion

Cost and Schedule Analysis

WDG Architecture: Ray Rivera Rick Hammann SK&A Engineering: Gino Biagioni Scott Stuart Sunburst Hospitality: Randy Hartig Penn State University: Dr. Memari

Prof. Hanagan
Prof. Boothby

And my family, friend and peers Questions