Damage identification of shear connectors in precast concrete sandwich panels based on the transmissibility function

SONG Zhengquan1, MENG Xianhong1, WANG Xiaofeng2

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 308-316.

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PDF(1931 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 308-316.

Damage identification of shear connectors in precast concrete sandwich panels based on the transmissibility function

  • SONG Zhengquan1, MENG Xianhong1, WANG Xiaofeng2
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Abstract

To solve the difficult problem of detection of shear connectors in precast concrete sandwich panels, a damage identification method based on transmissibility function is proposed. Firstly, the basic knowledge about transmissibility function is described, and then a theoretical model based on transmissibility function to detect damaged shear connectors is established. The transmissibility damage indicator (TDI) represented by the physical parameters of a precast concrete sandwich panel can be obtained. The theoretical analysis on the indicator mechanism reveals that the proposed method can not only reflect damage degree of a shear connector but also retain undisturbed by other adjacent shear connectors. In order to verify the proposed method, a reduced-scale specimen was conducted, and single damage and multiple damage conditions were designed. The experiment results reflect that the TDI for a damaged shear connector and the one for an intact shear connector show an obvious difference that can be as large as 39.2%. Therefore, the proposed method can effectively indicate the damage state and degree of a shear connector. The experiment results also validate that the damage of other shear connectors cannot influence the detection result in multiple damage conditions. Additionally, noise analysis has been carried out through the simulation results. It is suggested to maintenance a signal-to-noise ratio that is larger than 40db, therefore ensuring the robustness of the proposed method.

Key words

transmissibility function / damage detection;precast concrete sandwich panel;shear connector;transmissibility damage indicator (TDI)

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SONG Zhengquan1, MENG Xianhong1, WANG Xiaofeng2. Damage identification of shear connectors in precast concrete sandwich panels based on the transmissibility function[J]. Journal of Vibration and Shock, 2024, 43(14): 308-316

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