Robert M. Arnold Building Fred Hutchinson Cancer Research Center 1100 Fairview Seattle, Washington 372,503 ft2 $90,825,000 Office Space Parking Garage Laboratories Project Team Architecture Construction Management Mechanical & Electrical Affiliated Engineers Inc. Structural KPFF Consulting Engineers Zimmer Gunsul Frasca Partnership Turner construction Company 2005 Masonry Honor Award LEED Certified Building

Existing Structural System Typical Bay [30’ x 30’] 8 ½” Flat Plate w/ Drop Panels Post-Tensioned Distributed & Banded Tendons Plaza Cast in Place Reinforced Concrete Slab One-Way Slabs w/ Beams Beam Size Varies Gravity System 5th 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 Special Boundary Elements Braced Frames (Upper Levels) Chevron Braces Lateral System Diagonal Braces X-Braces Seismic Controls Design Base Shear: 5980 kip

Proposed Alternative Structural Design Proposal: Frame Main Portion of Building out of Steel Why?: Reduce Building Mass Improve Constructability Why Not the Entire Building: PLaza & Parking Garage Mechanical, Roof, & Penthouse Main Portion – the most highly occupied. - the garage is below grade - mech above level 5

New Structural System Floor Framing RAM Structural System Typical Live Load: 75 lb/ft2 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 RAM Structural System

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

Vibrations: Preliminary Analysis 5th Floor – Laboratory Area Evaluation for Walking Excitation ap = 0.00408 < 0.005 Lab Equipment is more sensitive to vibration Second analysis recommended

Braced Frames Concentrically Braced Frames Simplifying the Design Process Grouped Structure down to Level 5 Ordinary Braced Frames Special Braced Frames Columns: W14 Shapes X – Bracing: Rect.HSS columns

Construction Management of Alternative Design Complete Building Cost Estimate was not completed- Steel Alternative Cost was Estimated using Integrate Cost Estimating Steel Alternative Cost was Estimated using Integrate Cost Estimating Overall savings $1.8 million

Background Green Roof Retrofit Rainwater Retention & Detention 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 Background 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 All Potential Areas

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

Green Roof: Drainage Stormwater Runoff Leader Sizing 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 ft2 (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/ft2 = $253,000 Replacement w/ Green Roof @ $6.47/ft2 = $360,000 Life Cycle [50 year period] Ballasted EPDM: 3 @ $253,000 = $759,000 Extensive Sedum: 1 @ $360,000 = $360,000 Recommendation: Green Roof Installation @ Time of Replacement

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