基于小波包能量曲率差法的桥梁损伤识别试验研究

针对各种损伤识别指标中，小波包能量曲率差法仅有数值仿真、未经试验验证，尤其缺少实际工程验证问题，用数值模拟验证该方法识别结构损伤的有效性；利用沧州子牙河新桥替换下的梁体，进行两种工况损伤模拟。通过测试完好与损伤状态各点加速度响应，用小波包能量曲率差法识别损伤，考察小波函数和分解层数对识别效果的影响。结果表明，该方法有效，并可应用于实际工程。

Experimental study on bridge damage identification based on wavelet packet energy curvature difference method

Among those damage identification methods, the Wavelet Packet Energy Curvature Difference (WPECD) Method is an effective one. However, most of the existing methods rely on numerical simulation and are unverified via experiment, and very few of them have been applied to practice. In this paper, the validity of WPECD in structural damage identification is verified by a numerical example. A damage simulation experiment is taken on a real replaced girder at the Ziya River New Bridge in Cangzhou. Two damage cases are applied and the acceleration responses at the measuring points are obtained, based on which the damages are identified with the WPECD Method, and the influence of wavelet function and decomposition level is studied. The results show that the WPECD Method can identify structure damage efficiently and can be put into practice.