1. 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

2. 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

3. 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

4. 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

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

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

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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

14. 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: $253,000 = $759,000
Extensive Sedum: 1 @ $360,000 = $360,000
Recommendation: Green Roof Time of Replacement

15. Questions ?