Robert M Arnold Building Fred Hutchinson Cancer Research

Robert M. Arnold Building Fred Hutchinson Cancer Research Center 1100 Fairview Seattle, Washington Project Team 372, 503 ft 2 $90, 825, 000 Office Space Parking Garage Laboratories Architecture Zimmer Gunsul Frasca Partnership Construction Management Turner construction Company Structural KPFF Consulting Engineers Mechanical & Electrical Affiliated Engineers Inc. 2005 Masonry Honor Award LEED Certified Building

Existing Structural System Typical Bay Gravity System [30’ x 30’] 8 ½” Flat Plate w/ Drop Panels Post-Tensioned Plaza Distributed & Banded Tendons Cast in Place Reinforced Concrete Slab One-Way Slabs w/ Beams Beam Size Varies 5 th Floor Laboratories 13” Reinforced Concrete Slab Mechanical Level, Roof, & Penthouse Steel Framing W Shape Beams Rectangular HSS Columns

Existing Structural System Reinforced Concrete Shear Walls 20” & 24” thick Lateral System Special Boundary Elements Braced Frames (Upper Levels) Chevron Braces Diagonal Braces X-Braces Seismic Controls Design Base Shear: 5980 kip

Proposed Alternative Structural Design Proposal: Why? : Why Not the Entire Building: Frame Main Portion of Building out of Steel Reduce Building Mass Improve Constructability PLaza & Parking Garage Mechanical, Roof, & Penthouse

Floor Framing New Structural System Typical Live Load: 75 lb/ft 2 Composite Beams Typical Sizes W 16 x 26 W 16 x 31 Composite Girders Typical Sizes W 24 x 55 W 21 x 50 Steel Columns Typical Sizes W W RAM Structural System

New Structural System Architectural Considerations Columns – maintain location as per original design Floor Framing EXCEPTION: 1 Column addition Minimal Architectural Impact Discontinued @ & below Level 1

5 th Floor – Laboratory Area Vibrations: Preliminary Analysis Evaluation for Walking Excitation ap = 0. 00408 < 0. 005 Lab Equipment is more sensitive to vibration Second analysis recommended

Concentrically Braced Frames Simplifying the Design Process Grouped Structure down to Level 5 Ordinary Braced Frames Special Braced Frames Columns: W 14 Shapes X – Bracing: Rect. HSS columns Braced Frames

Construction Management of Alternative Design Complete Building Cost Estimate was not completed. Steel Alternative Cost was Estimated using Integrate Cost Estimating Overall savings $1. 8 million

Green Roof Retrofit Background Benefits Rainwater Retention & Detention Offsets peak runoff from peak rainfall Lower roof surface temperature during summer helps to reduce the urban heat island effect Types of Green Roofs Extensive Semi-intensive Intensive Benefits Rainwater Retention & Detention Lower roof surface temperature during summer Helps to reduce the urban heat island effect

Green Roof: Architectural Design Potential Areas for Green Roof – Intensive • roof area accessible & viewable by the existing roof terrace – Extensive • upper roof • lower roof – None • • • stairwells small area with limited access mechanical enclosures skylights plaza Green Roof Design Decision – Intensive • NONE – Intensive • All Potential Areas

Roof Construction Green Roof: Architectural Design Sedum Planting Layer [Gardendrain GR 30] 6” Roof Lite Extensive MC Root Barrier Hydrotech Gardendrain GR 30 EPDM [ Water Proofing Membrane] Rigid Insulation

Green Roof: Drainage Design Rainfall: 1 inch/hour Stormwater Runoff Rational Method (Runoff Model) Typical Roof: 0. 95 Lawn (Sandy Soil): 0. 10 Leader Sizing Based on Projected Area & Percentage of Vertical Surface Areas Does Not consider delayed runoff rate During sustained storm event rate can reach that of typical roof Total Drainage Area: 76, 425 ft 2 (28) 2 inch Leaders (14) 3 inch Leaders Total Drainage Rate: 19 gpm

Green Roof: Construction Management Cost Analysis [RS Means Renovation & Maintenance] Replacement w/ Ballasted EPDM @ $4. 55/ft 2 = $253, 000 Replacement w/ Green Roof @ $6. 47/ft 2 = $360, 000 Life Cycle [50 year period] Ballasted EPDM: 3 @ $253, 000 = Extensive Sedum: 1 @ $360, 000 = $759, 000 $360, 000 Recommendation: Green Roof Installation @ Time of Replacement

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