New Developments In Predicting The Strength Of Glass After 20 Or More Years Of Use In Buildings

This paper presents a new proposed method of determining the effective strength of glass that has previously been subjected (over many years) to fluctuating wind loads. The method includes the effect of the non-linear relationship between applied pressure and stress for the application of Brown's Integral. Actual wind pressures versus time data were integrated, together with the actual glass breakage data of 20 year old glass taken from a building. Comparing the results with the equivalent 3-second breakage pressure for new glass breakage, data indicated that the method could be used to predict the strength of even older glass.