基于车桥耦合振动的桥梁结构损伤识别

Analysis of Bridge Structure Damage Identification Based on Vehicle-bridge Coupling Vibration

为探讨桥梁结构的快速损伤识别方法,建立了车桥耦合振动模型,其中车辆为质量-阻尼-弹簧系统,桥梁结构基于有限元理论建模。分析了无损伤情况与损伤情况下车桥耦合动力响应的区别,随后通过预设的损伤情况下的车体重心处的过桥动力响应与数值计算结果的差值设定了目标函数,将问题转换为一个优化问题,采用遗传算法搜索出桥梁结构的损伤位置及损伤程度的近似最优解。算例结果表明,遗传算法能够准确预测出桥梁结构的损伤预设情况。

In order to discuss the rapid damage identification method of bridge structure,a vehicle bridge coupled vibration model is established,in which the vehicle is a mass damping spring system,and the bridge structure is modeled based on the finite element theory.The difference between the coupling dynamic response of vehicle and Bridge in the case of no damage and damage is analyzed.Then,the objective function is set by the difference between the dynamic response of the bridge at the center of gravity of the vehicle body in the case of pre-set damage and the numerical calculation result.The problem is transformed into an optimization problem,and the approximate optimal solution of the damage location and damage degree of the bridge structure is searched out by the inheritance algorithm.The results show that the genetic algorithm can accurately predict the damage prediction of the bridge structure.