作　　者： ; ; ;

机构地区： 中山大学工学院力学系

出　　处： 《计算力学学报》 2013年第S1期84-87,共4页

摘　　要： 应用有限元法将连续桥梁结构离散为两跨耦合欧拉-伯努利梁模型.利用Newmark直接积分法求出在移动车载作用下桥梁的动态响应,并进一步推导出动态响应桥梁对物理参数(如杨氏模量)的时域灵敏度.在反问题中利用基于响应灵敏度的有限元模型修正法识别出桥梁的局部损伤,并讨论了人工测量噪声对损伤识别结果的影响.算例表明本文方法能够快速有效地识别出耦合梁系统的局部损伤,并具有精度高、对测量噪声不敏感等特点。 In this paper,a continuous beam is discretized into a two span coupling Euler-Bernoulli beam system using the finite element method.Using Newmark integration method to calculate the dynamic response of the system under moving vehicle loads.Further,the dynamic response sensitivity with respect to the physical parameter(such as elemental Young's modulus) is obtained.In the inverse analysis,a response sensitivity-based finite element model updating approach is used to identify local damages of the bridge.And,the effect of artificial measurement noise on the identified results is discussed.Numerical simulation shows that the proposed method is rapid and efficient for both single and multiple damages in coupling beam systems with repeated natural frequencies.Good identified results can be obtained from the short time histories of a few number of measurement points,and it is insensitive to the measurement noise.

关 键 词： 移动荷载 损伤识别 响应灵敏度

领　　域： [建筑科学]