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URS – ARENA DISTRICT OFFICE BUILDING. DAVID LEE STRUCTURAL OPTION. PRESENTATION OUTLINE. 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION. David Lee Structural Option URS – Arena District Office Building. PRESENTATION OUTLINE.
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URS – ARENA DISTRICT OFFICE BUILDING DAVID LEE STRUCTURAL OPTION
PRESENTATION OUTLINE 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION David LeeStructural OptionURS – Arena District Office Building
PRESENTATION OUTLINE 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION David LeeStructural OptionURS – Arena District Office Building
EXISTING CONDITIONS 1 Located in Columbus, Ohio 5 story – 100,000 SF building March 2000 – January 2001 construction duration Total project cost $7 million David LeeStructural OptionURS – Arena District Office Building Building Statistics
EXISTING CONDITIONS 2 David LeeStructural OptionURS – Arena District Office Building Building Code
EXISTING CONDITIONS 3 David LeeStructural OptionURS – Arena District Office Building Typical Floor Framing
EXISTING CONDITIONS 4 Y X David LeeStructural OptionURS – Arena District Office Building Existing Lateral System
EXISTING CONDITIONS 5 Center of Mass Center of Rigidity David LeeStructural OptionURS – Arena District Office Building Drift and Torsion
PRESENTATION OUTLINE 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION David LeeStructural OptionURS – Arena District Office Building
DEPTH STUDY 1 OBJECTIVES Eliminate Moment Frames Reduce Floor Depth • CONSTRAINTS • North and West façade must be • free of obstruction • Large open floor space must be maintained David LeeStructural OptionURS – Arena District Office Building Objectives and Constraints
DEPTH STUDY 2 Design: Removed both moment frames Added a braced frame Result: Reduced eccentricity David LeeStructural OptionURS – Arena District Office Building Steel Alternative
DEPTH STUDY 3 Steel Member Size New steel frame identical to braced frame 1 David LeeStructural OptionURS – Arena District Office Building Steel Alternative
DEPTH STUDY 4 Constraint Met & Design Goal Achieved David LeeStructural OptionURS – Arena District Office Building Steel Alternative
DEPTH STUDY 5 Drift and Story Drift Calculated Maximum Drift L/780 *due to wind David LeeStructural OptionURS – Arena District Office Building Steel Alternative
DEPTH STUDY 6 Concrete Design Flat plate 2 way PT slab CIP columns Shearwalls David LeeStructural OptionURS – Arena District Office Building Concrete Alternative
DEPTH STUDY 7 8.5” concrete slab with density of 150PCF = 106PSF Recalculate Loads Self weight of building increase from 52 PSF to 106 PSF Seismic lateral load controls in both X and Y direction David LeeStructural OptionURS – Arena District Office Building Concrete Alternative
DEPTH STUDY 8 Y PT Slab Design Feasibility domain created to obtain possible force, eccentricity combination Steel envelop developed after tendon force is determined X David LeeStructural OptionURS – Arena District Office Building Concrete Alternative
DEPTH STUDY 9 Limit Floor Deflection L = l/360 D+L = l/240 • Max initial deflection = 0.1” Max sustained deflection = 0.46” Max long term deflection = 1.58” David LeeStructural OptionURS – Arena District Office Building Concrete Alternative
DEPTH STUDY 10 CIP Column Perform gravity design Consider slenderness effects Check punching shear David LeeStructural OptionURS – Arena District Office Building Concrete Alternative
DEPTH STUDY 11 Shearwalls Coincide with elevator shaft and stairwell Max Drift = l/1000 • Foundation • Larger footings needed • Existing foundations require 350CY of concrete • Concrete design require 1000CY of concrete for foundation David LeeStructural OptionURS – Arena District Office Building Concrete Alternative
PRESENTATION OUTLINE 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION David LeeStructural OptionURS – Arena District Office Building
BREADTH STUDY 1 Considerations Cost Construction Duration Constructability David LeeStructural OptionURS – Arena District Office Building Cost and Schedule
PRESENTATION OUTLINE 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION David LeeStructural OptionURS – Arena District Office Building
CONCLUSION & RECOMMENDATION • Concrete • Cost savings due to reduced floor depth • Flexibility in on-site alterations • No lead time Steel Construction cost savings of $122,000 Shorter construction duration Majority of office building in Columbus use steel frame David LeeStructural OptionURS – Arena District Office Building Recommendation
ACKNOWLEDGEMENTS URS Corporation Bill Huckleberry, Structural Engineer ONCORE Construction Raymond E. Sowers AE Faculty Professor Andres Lepage Professor M. Kevin Parfitt Professor Jelena Srebric Professor John Messner Rest of the AE Faculty AE Students Sean Flynn Brian Ault AND All my family and friends David LeeStructural OptionURS – Arena District Office Building