Abstract
Debonding defects are common and they are the main reason for the failure of hidden frame supported glass curtain walls, which are widely used as an external enclosure and decorative structure. In this paper, a debonding detection method for hidden frame supported glass curtain walls is developed based on nonlinear ultrasonic modulation and piezoceramic transducers. First, the excitation frequency was determined according to the response characteristics. Then, empirical mode decomposition (EMD) was applied to extract the feature components. After discrete Fourier transform (DFT), the nonlinear coefficients were calculated to evaluate the debonding defect. Finally, the experimental setup was established and a series of experiments were carried out to verify the feasibility and effectiveness of the nonlinear ultrasonic modulation method. The nonlinear harmonics detection method was also investigated and it was compared with the nonlinear ultrasonic modulation method. The detection effect at different temperatures and impact were studied. The results showed that the nonlinear coefficient increases with the debonding length. The mean squared error (MSE) of the nonlinear ultrasonic modulation method was improved by 41% compared with the nonlinear harmonics method. The nonlinear ultrasonic modulation method can successfully detect debonding defects in hidden frame supported glass curtain walls at different temperatures and impact.
Highlights
The hidden frame supported glass curtain wall is widely used in the construction field due to its dexterity, lightness, transparency and structural beauty
The mean squared error (MSE) of the nonlinear ultrasonic modulation method has been improved by 41%, the nonlinear ultrasonic modulation method is more accurate than the variation curves of the nonlinear coefficient under different debonding states
The nonlinear ultrasonic modulation method was developed for debonding detection detection in hidden frame supported glass curtain walls
Summary
The hidden frame supported glass curtain wall is widely used in the construction field due to its dexterity, lightness, transparency and structural beauty. It provides all the required functions of an external enclosure and decorative structure, which usually do not contribute to the load-bearing ability. Because of the effects of long-term thermal stress and environmental aging, hidden frame supported glass curtain walls inevitably suffer from defects such as cracks, bubbles, lamination and debonding defects. Debonding defects are very common in hidden frame supported glass curtain walls. There is a great need to develop an effective method for debonding detection in hidden frame supported glass curtain walls
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