1. Project: 250 West Street, Columbus, Ohio
Kevin A. Sponsler
Project: 250 West Street, Columbus, Ohio

2. Presentation Outline Building Overview Typical Floor System Analysis
Lateral System Analysis
Cost and Schedule (Current vs. Redesign)
Office Space Lighting System Design

3. Project Team Developer: Nationwide Reality Investors
Architect: Acock Associates Architects
Structural: Jezerinac Geers & Associates
Civil: Evans, Mechwart, Hambleton & Tilton
MEP: Prater Engineering Associates
Landscape: Myers-Schmalenberger/MSI
General Contractor: Messer Construction

4. Building Use 7-Story Building With Basement Approximately 200’ x 100’
143,000 Square Feet
Multi-Use Building
Parking
Storage
Retail Space
Office Space

5. Site Location

6. Architectural Aspects
Brick Columns With Limestone Accents
Large Glass Panels
Metal Panels
7th Story Balcony/Terrace

7. Structural System ASD Designed Floor System Lateral System Foundation
Composite Beams/Deck
Lateral System
Braced Frames
Foundation
Concrete Spread Footings

8. Mechanical Systems Variable Air Volume System
4 Air Handling Units / Cooling Tower
VAV Boxes on Each Floor
Restrooms Fed by Constant Air with Exhaust
CO Sensors, Exhaust System in Parking Area

9. Lighting Systems Lobby Garage Exterior
Low Voltage Recessed Cans
Wall Sconces
Garage
Metal Halide
Exterior
Metal Halide Cylinders on Columns
Remaining Lighting Not In Initial Contract

10. Electrical Systems Shared With Adjacent Building
277/480 Volt, 3 Phase System
Each Floor Supplied with 277/480 V, 3 Phase
Powers Lighting/Other Equipment
Stepped Down at Each Floor to 120/208 Volt
Powers Receptacles

11. Current Floor System

12. Floor System Options Composite Beams/Deck Framed N-S Direction
Composite Beams/Deck Framed E-W Direction (Current System)
Non-Composite System Framed E-W Direction

13. Preliminary System Comparisons
Preliminary Design in RAM
Results
Composite N-S
Composite E-W
Non- Composite
Cost ($)
89,200
79,000
96,000
Erection (days)
9.5
8.5 6
Steel Depth (in.) 24 27 30
Weight (tons)
47.6
44.8
74.0

14. Building Corner Framing

15. Corner Connection Options
Field Welded Flanges
Moment End Plate
Flange Plates
Beam Cantilevered Over Column

16. Corner Framing Comparison
Costs ($)
Field Welded Flanges
Moment End Plates
Top & Bottom Flange Plates
Beam Cantilevered Over Column
Materials
698
708
730
842
Shop
720
765
1080
870
Field
296 49 76
Total
1714
1522
1886
1761

17. Final Floor Design

18. Floor System Comparison
Current Design
New Design
Steel (tons)
59.2
50.2
Members
117
111
Shear Studs
1291
3710

19. Floor System Conclusion
New System vs. Current System (1 Floor)
9.0 Less Tons of Steel
2,419 More Shear Studs
Costs $8,800 Less
Depth of System Reduced 3”

20. Current Lateral System
4 Braced Frames
Located in Central Core of Building
2 North-South Direction
2 East-West Direction
Combination of:
Diagonal Braces
Inverted V-Type Braces

21. Earthquake Loads (R=3 vs. R=5)
Ordinary Concentrically Braced Frame
R=5
Brace Strength = .8ФcPn
Inverted V-Type Bracing Strength = 1.5 x Required
Slenderness Restrictions
Connection Restrictions
System Not Specifically Designed for Seismic
R=3
No Other Restrictions

22. Story Forces

23. Difference in Brace Sizes
Frame on Line D From
Braces Below Level
R=3
R=5 2
HSS 8x8x5/16 3
HSS 8x8x1/4 4 5 6 7
HSS 6x6x1/4
Roof
HSS 6x6x3/16

24. Lateral Load Conclusion
Members
Extra Restrictions on Design Using R=5
Some Member Sizes Reduced Using R=5
2 Tons Less Steel
Costs
$ 2,700 less with R=5
Little Effect on Other Systems

25. Current Design Cost & Schedule
Material
$743,000
Field Labor
$222,000
Total Cost
$965,000
Erection Gang
24 Days
Detailing Gang
35 Days
Shear Studs
10 Days

26. New Design Cost & Schedule
R=3
R=5
Material
$698,000
$695,000
Field Labor
$216,000
Total Cost
$914,000
$912,000
Erection Gang
23 Days
Detailing Gang
32 Days
Shear Studs
20 Days

27. Cost Conclusion Redesign Saves Over $50,000
Seismic Design Criteria Has Little Effect on Structural Costs (This Building)

28. Lighting Criteria First Floor Open Plan Office Tasks
Reading Copied Tasks – Ditto Copies
Handwritten Tasks With #2 Pencil
Keyboard Reading
Target Illumination
75 fc

29. Fixture Selection Recessed Parabolic 2’ x 4’ Fixture 4” Louver
Manufacturer: Lumax Industries Inc.
4PG33224-CO4L18
Lamps: Sylvania
FO32/835XPS/ECO
Ballast: Sylvania
QTP 3x32T8/277 ISN-A

30. Office Layout / Reflectance

31. Lighting Design

32. Lighting Design

33. Conclusion Floor System Lateral System
Maintained Strength
Reduced Cost - $8,800/floor
Reduced Depth
Lateral System
Reduced Material Costs
Overall – Reduced Cost by $50,000

34. Questions