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根据损伤桥梁在车辆荷载作用下的动力响应特点,以及提升小波变换对信号突变信息的放大功能,提出了利用桥梁运营荷载作用下加速度响应提升小波变换系数的分布特性对结构损伤进行识别的方法。首先,采集桥梁在行车荷载作用下的加速度响应信号;然后,对加速度响应信号进行提升小波变换,分别利用加速度响应信号、加速度响应信号差,提升小波变换系数空间变化的峰值识别损伤位置;最后,对行车速度、损伤位置、损伤程度和测量噪声对损伤识别效果的影响进行了分析讨论。结果表明:在行车速度8m/s以下、测量噪声不高于5%情况下,利用运营荷载作用下桥梁单点动力响应信号提升小波变换,可以实现桥梁多处损伤的检测和识别。
According to the characteristics of the dynamic response of damaged bridges under vehicle loads and the amplification function of wavelet transform to improve the signal abrupt information, a method of identifying structural damage by using the distribution of acceleration response and wavelet transform coefficients under the influence of bridge operating loads is proposed. Firstly, the acceleration response signal of the bridge under the driving load is collected. Then, the lifting response of the acceleration signal is updated by wavelet transform. The acceleration response signal and the acceleration response signal difference are respectively used to enhance the peak recognition damage position of the wavelet transform coefficient. Finally, The effects of driving speed, damage location, degree of damage and measurement noise on damage identification were analyzed and discussed. The results show that the detection and identification of multiple damage of the bridge can be realized by using the single point dynamic response signal of the bridge to enhance the wavelet transform under the condition that the measured noise is not higher than 5% under the condition that the running speed is less than 8m / s.