robert m. arnold building fred hutchinson cancer research center project team architecture...
TRANSCRIPT
Robert M. Arnold Robert M. Arnold BuildingBuilding
Fred Hutchinson Cancer Research Fred Hutchinson Cancer Research CenterCenter
Project Team Architecture
Construction Management
Mechanical & ElectricalAffiliated Engineers Inc.
StructuralKPFF Consulting Engineers
Zimmer Gunsul Frasca Partnership
Turner construction Company
1100 Fairview Seattle, Washington
$90,825,000
LEED Certified Building
Office SpaceParking Garage
Laboratories
2005 Masonry Honor Award
372,503 ft2
Existing Structural SystemG
ravit
y S
yst
em
Typical Bay
Plaza
5th Floor Laboratories
Mechanical Level, Roof, & Penthouse
Distributed & Banded Tendons
Post-Tensioned
[30’ x 30’]
8 ½” Flat Plate w/ Drop Panels
Beam Size VariesOne-Way Slabs w/ Beams
Cast in Place Reinforced Concrete Slab
Steel Framing
Rectangular HSS Columns
W Shape Beams
13” Reinforced Concrete Slab
30'
30'
10'
10'
Existing Structural SystemLa
tera
l S
yst
em
Reinforced Concrete Shear Walls20” & 24” thick
Special Boundary Elements
Braced Frames (Upper Levels)Chevron Braces
X-BracesDiagonal 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 ConstructabilityWhy Not the Entire
Building: PLaza & Parking GarageMechanical, Roof, & Penthouse
New Structural System
Composite Beams
Steel Columns
Floor Framing
Composite Girders
RAM Structural System
Typical Sizes
W 16 x 26
W 16 x 31
Typical Sizes
W 24 x 55
W 21 x 50
Typical Sizes
W
W
Typical Live Load: 75 lb/ft2
New Structural System
EXCEPTION:
Minimal Architectural Impact
Floor
Fram
ing
1 Column addition
Architectural Considerations
Columns – maintain location as per original design
Discontinued @ & below Level 1
Vibrations: Preliminary Analysis 5th Floor – Laboratory Area
Evaluation for Walking Excitation
Lab Equipment is more sensitive to vibration
Second analysis recommended
ap = 0.00408 < 0.005
Braced Frames
Columns: W14 Shapes
X – Bracing: Rect.HSS columns
Ordinary Braced Frames
Concentrically Braced Frames
Special Braced Frames
Simplifying the Design Process
Grouped Structure down to Level 5
Construction Management of Alternative Design
Steel Alternative Cost was Estimated using Integrate Cost Estimating
Overall savings
Complete Building Cost Estimate was not completed-
Steel Alternative Cost was Estimated using Integrate Cost Estimating
$1.8 million
Green Roof RetrofitBenefits
Rainwater Retention & DetentionOffsets peak runoff from peak rainfallLower roof surface temperature during summerhelps to reduce the urban heat island effect
Types of Green RoofsExtensiveSemi-intensiveIntensive
Back
gro
un
d
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 not f easibil e
intensive gr eenr oofextensive gr eenr oofnot possibl e
Green Roof: Architectural Design
Roof
Con
stru
ctio
n
[Gardendrain GR 30]
Sedum Planting Layer
Rigid Insulation
6” Roof Lite Extensive MC
Root Barrier
Hydrotech Gardendrain GR 30
EPDM [ Water Proofing Membrane]
Green Roof: Drainage
Stormwater RunoffRational Method (Runoff Model)
Typical Roof: 0.95
Does Not consider delayed runoff rate
Design Rainfall: 1 inch/hour
Leader SizingBased on Projected Area
& Percentage of Vertical Surface Areas
Lawn (Sandy Soil): 0.10
During sustained storm event rate can reach that of typical roof
Total Drainage Rate: 19 gpm
(28) 2 inch Leaders
(14) 3 inch Leaders
Total Drainage Area: 76,425 ft2
Green Roof: Construction Management
Cost Analysis [RS Means Renovation & Maintenance]
Replacement w/ Ballasted EPDM
Replacement w/ Green Roof
Ballasted EPDM: 3 @ $253,000 = $759,000Life Cycle [50 year period]
Extensive Sedum: 1 @ $360,000 = $360,000
@ $4.55/ft2 = $253,000
@ $6.47/ft2 = $360,000
Recommendation: Green Roof Installation @ Time of Replacement
Questions ?