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Kevin A. Sponsler

Kevin A. Sponsler. Project: 250 West Street, Columbus, Ohio. Presentation Outline. Building Overview Typical Floor System Analysis Lateral System Analysis Cost and Schedule (Current vs. Redesign) Office Space Lighting System Design. Project Team. Developer: Nationwide Reality Investors

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Kevin A. Sponsler

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  1. 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 • 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 • 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

  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 ($)

  17. Final Floor Design

  18. Floor System Comparison

  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 4.4-5.1

  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

  26. New Design Cost & Schedule

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

  34. Questions

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