Robert M. Arnold Building Fred Hutchinson Cancer Research Center

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 ?