中山大学学报自然科学版 ›› 2015, Vol. 54 ›› Issue (3): 10-13.

• 研究论文 • 上一篇    下一篇

基于车致振动响应的含分布损伤桥梁结构识别方法

李海龙,吕中荣,刘济科   

  1. 中山大学应用力学与工程系,广东 广州510275
  • 收稿日期:2014-10-27 出版日期:2015-06-25 发布日期:2015-06-25
  • 通讯作者: 吕中荣;E-mail:lvzhr@mail.sysu.edu.cn

Identification of Distributed Damage in Bridges from Vehicle Induced Dynamic Responses

LI Hailong,LU Zhongrong,LIU Jike   

  1. Department of Applied Mechanics and Engineering, Sun Yat-sen University, Guangzhou 510275,China
  • Received:2014-10-27 Online:2015-06-25 Published:2015-06-25

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。

关键词: 车桥耦合系统, 动力响应, 非线性弹簧, 裂纹识别, 灵敏度

Abstract: 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 coupled 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.

Key words: bridge-vehicle system, dynamic response, nonlinear springs, damage detection, sensitivity.

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