The New Parkland Hospital Presentation
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Transcript of The New Parkland Hospital Presentation
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THE NEW PARKLAND HOSPITAL
Presented by: Chuck Armstrong – Corgan Associates, Inc. Jeff Haber – W&W Glass, LLC
A Case Study on the Design-Assist Process for the Structural Glass Façade
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¨ Architect: ¡ HDR & Corgan Associates, Inc. (Joint Venture), Dallas, TX
¨ CM at Risk: ¡ BARA (Joint Venture), Dallas, TX
¨ Structural Glass System: ¡ Pilkington, St. Helens, UK
ú Manufacturer - Structural Glass Fabrication & Fittings ¡ W&W Glass, LLC, Nanuet, NY
ú Engineering & Design ¡ Tripyramid Structures, Waterford, MA
ú Manufacturer - Plate Beams, Tension Rods & Fittings ¡ Harmon, Inc., Lewisville, TX
ú Installation
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Video Tour of The New Parkland Hospital
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¨ In the Beginning…
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Cable Wall vs. Tension Rod/Plate
Beam Wall
Pros -‐ Higher Transparency -‐ Less Load on Boundary Structure
-‐ No Horizontal Metal -‐ Good Transparency
-‐ Less Expensive Boundary Structure
-‐ VerAcal Rods Smaller Than Cables
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Cable Wall vs. Tension Rod/Plate
Beam Wall
Cons -‐ Higher Loads on Boundary Structure -‐ Steel Blades May Block
View (Inside to Out)
-‐ AddiAonal Steel Required….$$$
-‐ ConnecAons to Columns Visible
-‐ Large ConnecAons at Head and Sill
(If Exposed = $$$; If Concealed, Perimeter Detailing Can Be Challenging)
-‐ IGU Glass DeflecAons Are Higher, Requiring Significant AddiAonal Restraint; Can Result in Higher Loads into Building and Larger Dia. Cables = $$$
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¨ Cable Wall ¡ Reaction Loads
ú 45 Kips Tension per Cable (Tension Load at Head and Sill) 1” Stainless Steel Cables
¡ Steel Sizing at Head ú W24 x162
¨ Tension Rod/Plate Beam Wall ¡ Reaction Loads
ú 4 Kips – Dead Load 3/8” Stainless Steel Rods
ú 3.7 Kips per Plate Beam (7.4 Kips per Column @ 30’ O.C.) – Wind Load ¾” x 10” Plate Beams
¡ Steel Sizing at Head ú W16x57 - Savings of 16,650 Pounds of Steel!
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Architect
+ Structural Engineer + Façade Contractor
Affordable Solution to Meet the
Design Intent and Satisfy the Budget
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¨ Desired Performance: ¡ VLT: 0.50 ¡ Rf: 0.10 ¡ SHGC: 0.28 ¡ SC: 0.32 ¡ U-Value: 0.24/0.26 (Summer/Winter)
¨ IGU Lami was requested for Acoustics & Safety
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¨ Meeting the architect’s design intent while satisfying the Owner’s budget restraints.
¨ Looking for cost reductions in the boundary structure as a result of modifications to the glazing system.
¨ Finding an IGU/spacer that was capable of meeting the aesthetic requirement of a 5’ x 9’ panel with only four corner support.
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¨ Approx. $100,000 reduction in steel costs!
¨ Additional savings
from decrease in concrete reinforcement in the floor and columns.
Cable Wall
Plate Beam Wall
6” Narrower Beam
8.5” Shorter Beam
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DESIGN CRITERIA
9 ft span
20 psf wind load
Edge Defl.
Limit Req’d Glass Thickness Glass Cost Increase
L/175 3/8” -‐ Air -‐ 3/8” -‐ SGP -‐ 3/8” + 50% L/140 3/8” -‐ Air -‐ 3/8” -‐ SGP -‐ 5/16” + 43% L/100 3/8” -‐ Air -‐ 5/16” -‐ SGP -‐ 5/16” + 35% L/50 3/8” -‐ Air -‐ 1/2” -‐
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Surface 1: Contracts
Surface 2: Stretches
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Typical IGU Construction
PIB Seal Degradation
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PIB Seal Failure PIB Seal Degradation
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¨ Typical insulating unit manufacturers allow L/175 edge deflection. Some of the highest quality manufacturers allow a maximum IGU edge deflection of L/140.
¨ IGU Lami Glass Make-up:
¡ 3/8” Optiwhite w/ HP 50/27 low-e on #2 – 5/8” Air – 1/4” Optiwhite – .060” PVB – 1/4” Optiwhite
¨ Only Pilkington could provide an IGU that could deflect + 2” and - 2” at the edges and still remain completely sealed without failure. This equals L/50.
Edge Defl. Limit Req’d Glass Thickness @ 5’ Wide x 9’ Tall Glass Cost Increase DeflecFon
L/175 3/8” -‐ Air -‐ 3/8” -‐ SGP -‐ 3/8” + 50% 0.62” L/140 3/8” -‐ Air -‐ 3/8” -‐ PVB -‐ 3/8” + 45% 0.77” L/100 3/8” -‐ Air -‐ 5/16” -‐ SGP -‐ 5/16” + 35% 1.08” L/50 3/8” -‐ Air -‐ 1/4” -‐ PVB -‐ 1/4” -‐ 2.2”
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7’ x 14’ Panels Deflect Up to 4” In and 4” Out!!!
Centre Square Deflection Video
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5’2” x 7’5” Panels Deflect Up to 4 5/8” In / 4 5/8” Out!!!
City Creek Center Deflection Video
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¨ The Pilkington Planar IGUs were put through accelerated weather and dew point testing to determine if there were any seal failures (condensation forms inside the unit showing a failure) after the extreme deflections the IGUs were put through.
¨ The IGUs were then retested and put through
the full process again and PASSED.
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IGU Construction Failed Condensation Test: Unit PIB Seal Compromised
ASTM E-546
Standard Test Method for Frost/Dew Point of Sealed Insulating Glass Units
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¨ Pilkington’s Large Deflection Spacer Design ¡ 300% increase in amount of butyl for the primary
seal. ¡ Unique corner conditions for discontinuous spacers
to keep unit sealed under shear stress at the edges.
STANDARD SPACER LARGE DEFLECTION SPACER
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CONSTRUCTION Erection of the Structural Glass Wall
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THE NEW PARKLAND HOSPITAL
Presented by: Chuck Armstrong – Corgan Associates, Inc. Jeff Haber – W&W Glass, LLC
A Case Study on the Design-Assist Process for the Structural Glass Façade