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