The New Parkland Hospital Presentation
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Transcript of The New Parkland Hospital Presentation
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
¨ 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
Video Tour of The New Parkland Hospital
¨ In the Beginning…
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
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 = $$$
¨ 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!
Architect
+ Structural Engineer + Façade Contractor
Affordable Solution to Meet the
Design Intent and Satisfy the Budget
¨ 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
¨ 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.
¨ 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
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” -‐
Surface 1: Contracts
Surface 2: Stretches
Typical IGU Construction
PIB Seal Degradation
PIB Seal Failure PIB Seal Degradation
¨ 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”
7’ x 14’ Panels Deflect Up to 4” In and 4” Out!!!
Centre Square Deflection Video
5’2” x 7’5” Panels Deflect Up to 4 5/8” In / 4 5/8” Out!!!
City Creek Center Deflection Video
¨ 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.
IGU Construction Failed Condensation Test: Unit PIB Seal Compromised
ASTM E-546
Standard Test Method for Frost/Dew Point of Sealed Insulating Glass Units
¨ 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
CONSTRUCTION Erection of the Structural Glass Wall
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