URS – ARENA DISTRICT OFFICE BUILDING

1. URS – ARENA DISTRICT OFFICE BUILDING DAVID LEE STRUCTURAL OPTION

2. PRESENTATION OUTLINE 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION David LeeStructural OptionURS – Arena District Office Building

3. PRESENTATION OUTLINE 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION David LeeStructural OptionURS – Arena District Office Building

4. 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

5. EXISTING CONDITIONS 2 David LeeStructural OptionURS – Arena District Office Building Building Code

6. EXISTING CONDITIONS 3 David LeeStructural OptionURS – Arena District Office Building Typical Floor Framing

7. EXISTING CONDITIONS 4 Y X David LeeStructural OptionURS – Arena District Office Building Existing Lateral System

8. EXISTING CONDITIONS 5 Center of Mass Center of Rigidity David LeeStructural OptionURS – Arena District Office Building Drift and Torsion

9. PRESENTATION OUTLINE 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION David LeeStructural OptionURS – Arena District Office Building

10. 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

11. DEPTH STUDY 2 Design: Removed both moment frames Added a braced frame Result: Reduced eccentricity David LeeStructural OptionURS – Arena District Office Building Steel Alternative

12. DEPTH STUDY 3 Steel Member Size New steel frame identical to braced frame 1 David LeeStructural OptionURS – Arena District Office Building Steel Alternative

13. DEPTH STUDY 4 Constraint Met & Design Goal Achieved David LeeStructural OptionURS – Arena District Office Building Steel Alternative

14. DEPTH STUDY 5 Drift and Story Drift Calculated Maximum Drift L/780 *due to wind David LeeStructural OptionURS – Arena District Office Building Steel Alternative

15. DEPTH STUDY 6 Concrete Design Flat plate 2 way PT slab CIP columns Shearwalls David LeeStructural OptionURS – Arena District Office Building Concrete Alternative

16. 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

17. 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

18. 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

19. DEPTH STUDY 10 CIP Column Perform gravity design Consider slenderness effects Check punching shear David LeeStructural OptionURS – Arena District Office Building Concrete Alternative

20. 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

21. PRESENTATION OUTLINE 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION David LeeStructural OptionURS – Arena District Office Building

22. BREADTH STUDY 1 Considerations Cost Construction Duration Constructability David LeeStructural OptionURS – Arena District Office Building Cost and Schedule

23. PRESENTATION OUTLINE 1. EXISTING CONDITIONS 2. DEPTH STUDY 3. BREADTH STUDY 4. CONCLUSION & RECOMMENDATION David LeeStructural OptionURS – Arena District Office Building

24. 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

25. 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

26. QUESTIONS ?