基于传递率函数的预制混凝土夹心保温墙板连接件损伤识别

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (14) : 308-316.

论文

宋正泉1，孟宪宏1，王晓锋2

作者信息 +

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

SONG Zhengquan1, MENG Xianhong1, WANG Xiaofeng2

Author information +

文章历史 +

摘要

为解决预制混凝土夹心保温墙板中连接件检测困难问题，提出了基于传递率函数的连接件损伤识别方法。首先介绍了传递率函数原理，建立了用于检测预制混凝土夹心保温墙板中损伤连接件的传递率函数理论模型，得出可用预制混凝土夹心保温墙板物理参数表示的传递率损伤指标 (transmissibility damage indicator，TDI)。分析理论模型的检测机理表明，此方法不仅可以判断连接件损伤程度而且检测结果不受未被检测损伤连接件干扰。分别设置单损伤和多损伤工况，通过缩尺模型试验，验证了所提出检测方法的可行性，试验结果表明：损伤连接件和无损连接件的TDI指标之间存在着明显的不同，差异达到39.2%，所提出方法可以有效确定连接件的损伤状态与程度，且多损伤工况下其他未被检测的损伤连接件对检测结果无影响。进一步通过数值模拟结果测试所提出方法的抗噪性，建议使用该方法时，保证信噪比在40db以上，从而保障方法的鲁棒性。

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.

导出引用

宋正泉1，孟宪宏1，王晓锋2. 基于传递率函数的预制混凝土夹心保温墙板连接件损伤识别[J]. 振动与冲击, 2024, 43(14): 308-316

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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