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Atmospheric Effects on Insulating Glass Units:

Atmospheric Effects on Insulating Glass Units analyses insulating glass (IG) units constructed in one environment and transported to another.  Combinations of changes in elevation, temperature, and barometric pressure create loads on IG units.  Some loads are temporary such as those resulting from elevation changes during transportation as well as variations in temperature and barometric pressure.  Other loads can be permanent such as final installation at a different elevation than manufacture.  This software uses finite difference analysis, parameters consistent with those in ASTM E 1300–07, “Standard Procedure to Determine the Load Resistance of Glass in Buildings” and load sharing computations to determine stresses in glass lites in IG units and, where applicable, probabilities of breakage consistent with ASTM E 1300-07.  The program addresses load duration and glass in-service life in its computations.

This program references:

“Glass Failure Prediction Model ” by  W. L. Beason and J. R. Morgan, 1984.

“The Strength of Weathered Window Glass” by H. S. Norville and J. E. Minor, 1985.

 “Nonlinear Analysis of Rectangular Glass Plates by Finite Difference Method” by C.V. G. Vallabhan and B. Y-T Wang, 1981.

"The Structural-Mechanics Behavior of Insulating Glass Units" by C. David Chou, Joseph E. Minor, and C.V. Girija Vallabhan. 1986.

ASTM E 1300–07, “Standard Procedure to Determine the Load Resistance of Glass in Buildings


  • User Input
    • Construction parameters (temperature and elevation)
    • Transport parameters (temperature, elevation and duration or maximum exposure)
    • IG unit configuration
      • Rectangular dimensions
      • Air space thickness
      • Glass lite types and constructions
      • Glass thicknesses
      • IG Structural Sealant contact dimensions
      • New or weathered glass parameters


  • Calculations and Results
    • Results are calculated for Blocked, Unblocked and Half-Blocked conditions. 
      • Calculated pressure difference across each lite
      • Maximum principal stresses in lites
      • Maximum center of glass deflection for each lite
      • Probability of Breakage for annealed glass lites based upon glass parameters selected
      • IG Structural Sealant shear stress

When the designer achieves an optimum insulating glass design configuration, the program prints a report suitable for presentation to a building official.


    Sample Report:  Atmospheric Effects Report





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System Requirements:


Operating Systems:

     Microsoft Windows 2000

     Microsoft Windows XP

     Microsoft Windows Vista 32bit, 64bit

     Microsoft Windows 7

     Microsoft Windows 10





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