Damage Identification For Glass Curtain Wall Based On Wavelet Transform And Transmissibility Function

Glass curtain wall is widely used in the non-load-bearing structural components of modern buildings because of its light,transparent and energy-saving characteristics.However,damage of structural adhesive cause by plate falling off frequently,resulting in casualties and a large number of property losses.The existing detection technology does not meet the needs of safety evaluation of glass curtain wall.How to quickly and accurately carry out safety warning for glass curtain wall is an urgent problem to be solved.In this paper,hidden frame glass curtain wall is taken as the research object.The relationship between the damage degree and damage parameters of the structural adhesive of glass curtain all is mainly studied.Wavelet transform combined with Hilbert envelope spectrum is introduced into the detection process of the adhesive damage of glass curtain wall so as to achieve a rapid and accurate evaluation of the safety status of glass curtain wall.Using ANSYS finite element software simulation verify the frequency response function and vibration transmissibility as damage parameter to identify structural adhesive degumming degree of feasibility under different working conditions of glass curtain wall structural adhesive state of degumming.The results show that the frequency response function and vibration transmissibility are can be used as a damage parameter evaluation of glass curtain wall safety state.Vibration transmissibility is superior to the frequency response function and is not affected by structural adhesive degumming position and the effects of specimen size.Through numerical simulation,wavelet transform is used to decompose and reconstruct the damage signals of the glass curtain wall's frequency response function under different damage conditions,and Hilbert transform is used to transform the first-order detail signal components in the frequency domain to Hilbert envelope spectrum with mutation signal.The results show that the Hilbert envelope spectrum obtained by the frequency response function by wavelet transform is more sensitive to the abrupt signal entrapped by the vibration signal than the frequency response function.Through experiments,it is verified that the method of combining Hilbert envelope spectrum and vibration transmittance by wavelet transform can effectively reflect the relationship between the damage degree of structural adhesive of glass curtain wall and the damage parameters of vibration transmittance,and provide a reference for the safety evaluation of glass curtain wall.The experimental results show that the rubber hammer is an effective method to obtain the accurate vibration spectrum of the glass plate.In order to obtain the accurate vibration transfer rate,it is suggested to select the edge of the glass plate as the measuring point.