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中文摘要：
采用Newmark直接积分法和龙格库塔法求解了非线性车桥耦合系统的振动响应,并利用加速度响应灵敏度方法对含裂纹梁结构进行分布类型的损伤识别。文中车辆采用含非线性弹簧的半车模型,桥梁被离散为欧拉梁单元,裂纹引起的桥梁损伤模拟为桥梁局部刚度的线性分布的减少。数值算例表明,在5%噪声情况下,加速度响应灵敏度方法依然可以较准确地识别出桥梁损伤的分布情况。
英文摘要：
A distributed damage identification approach under moving vehicle loads is presented based on dynamic response sensitivity. Numerical studies are carried out on a simply supported beam under a vehicle with nonlinear springs for identication of distributed damage due to the crack. Combined Newmark direct integration method and Runge-kutta method are used to calculate the dynamic responses of the cou- pled bridge-vehicle system. The numerical results show that the distributed damage （s） can be identified accurately even with 5% noise in the measured acceleration data. And more accelerometers are needed if there are multiple cracks in the bridge.
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