Blast performance of point fixed assemblies utilizing crystal clear TSSA

Architectural preferences for commercial building continue towards increased transparency resulting in large lites of glass with minimal visual obstruction. Point fixed glazing systems meeting this architectural desire are popular especially in entry or common areas at ground level. Recent technology advances have allowed the use of super high strength adhesives to attach these large lites to fittings without the requirement of drilling through glass. The typical ground floor location increases the probability that the system must function as a protective layer for occupants of the building above and beyond the typical wind loading requirements. Some testing has been completed on drilled point fixing systems but not on the adhesive method.

The purpose of this paper is to document mock-up testing using a shock tube with an explosive charge to simulate blast loads onto adhesively bonding transparent assemblies. The variables include pre-defined blast loads from ASTM F2912 performed on lites laminated with polyvinyl butyral interlayer.

The study, a first of its kind, enables the ability to quantify potential blast performance for use in large scale testing and building design. The testing shows that engineering of the system can be done to design adhesively attached systems to meet specified loads.