科研之友
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摘要
The glass panel dropping off of hidden frame supported glass curtain wall (HFSGCW) caused by structural sealant failure has become a severe safety problem up to now. In order to obtain a rapid and effective safety-state evaluation method for HFSGCW glass panel, the modal analysis of a simulation HFSGCW glass panel at different working conditions was done using data acquisition and signal processing sensor system. The safety-state evaluation model for HFSGCW glass panel was proposed on the basis of modal parameters. The results showed that the modal frequency of HFSGCW glass panel decreases and the damping ratio increases with the failure increase of structural sealant. The first order modal parameters are more suitable for glass safety-state evaluation. The first peak frequency and damping ratio obtained from the self-power frequency spectrum of the middle location of HFSGCW glass panel can be used instead of modal analysis results to evaluate the safety-state of glass panel. The sealant failure can be identified from the amplitude change of the first peak frequency when the structural sealant is chosen as the excitation point. The safety-state HFSGCW glass panel is divided into three levels providing important guiding significance for HFSGCW safety-state evaluation.
