High Strength Glass Testing and Model Validation for Static and Dynamic Loading

Abstract

The Glass Failure Prediction Model (GFPM) is the basis for ASTM E1300 which is used across the nation for window glass design. ASTM E1300 states that the model is valid only for annealed (AN) glass but, ASTM E1300 does incorporate heat strengthened (HS) or fully tempered (FT) glass through the use of multiplication factors. Rather than multiplication factors, this paper will address modifying the GFPM to incorporate these types of higher strength glass. Designers can then incorporate the model into common design methods such as single degree of freedom (SDOF) and finite element analysis (FEA) to analyze dynamic performance of glazing layups. To validate the modified GFPM, both static and dynamic testing of high strength glass was completed and comparisons to analysis predictions will be provided in the paper. The paper also illustrates how to use the modified GFPM in window design for both static and dynamic applications through the use of Singledegree-of-freedom Blast Effects Design Spreadsheet for Windows (SBEDS-W), a SDOF design tool to be released by the U.S. Army Corps of Engineers Protective Design Center (USACE PDC). Dynamic window analysis tools like SBEDS-W will be utilized more frequently due to the new threat-based requirements for windows and doors in the Unified Facilities Criteria (UFC) 4-010-01 DoD Minimum Antiterrorism Standards for Building (9 February 2012). Also, an understanding of the failure prediction capabilities of SBEDS-W is important for engineers performing the dynamic glazing analyses.