Predicting the thermo-mechanical behavior of a gypsum-to-wood nailed connection Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6t053k113

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  • With high costs of testing and rating a structural system for fire resistance, the utilization of computer simulations that approximate the integrity of structural subsystems could conceivably reduce development costs. Before an analysis of a light-frame wood system can occur, information on the components of the substructure must be known. The purpose of this study was to systematically study the effects of thermal load on the strength and mode of failure in a nailed gypsum-to-wood stud connection. Initially the distribution of temperatures within the connection was sought by using a finite element analysis. The analysis simulated exposure to a standard fire as dictated by the American Society for Testing Materials standard E-119. The thermal properties of the materials involved are documented in the literature. Close agreement was found between analytical results and specimens exposed to standard test conditions. With the temperatures along the connection known, the properties of the three materials at elevated temperatures were needed. For wood and steel, this information has been well documented. The property values for gypsum were accumulated through testing gypsum board in compression at various temperatures. The results showed an increase in compressive strength and stiffness up to 100 C followed by a decrease in strength. These results were combined with the analytically determined temperature distribution to obtain the material properties in the neighborhood of the connection. The overall model was an extension of the yield theory available in the literature. The approach used was to evaluate the connection at set time intervals and calculate the strength of the connection. Each time interval had a different set of material property values for each material in the connection as dictated by the temperature distribution. The mode of failure did not change from that which occurred at room temperature, compression strength of the gypsum being the determining factor. The load at which failure occurred increased in the first five minutes and then sharply decreased. This can now be incorporated into models of wall systems for room temperature to predict behavior of walls during exposure to fire.
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