【摘要】 提出了由过桥汽车激励所产生的动力响应识别桥梁损伤的灵敏度方法。将桥梁等效为等长的欧拉梁单元,汽车等效为两自由度五参数模型,用桥梁损伤因子定义单元抗弯刚度的减小(即损伤的程度)。由损伤因子零向量的假设开始,桥梁损伤可以根据最小二乘法和正则化方法用测试得到的桥梁动力响应识别得到,在数值模拟中考虑了测试误差和路面不平顺的影响。算例表明,提出的识别方法理论正确,识别得到的结果可信,可以有效地、方便地识别桥梁的损伤。更多还原

【Abstract】 The bridge damage identification using dynamic response induced by a vehicle moving on a simply supported bridge deck is presented.The bridge is modeled as a finite element model based on the sensitivity analysis and the moving vehicle is modeled as a two-degree-of-freedom system with five parameters.The damage factor are defined using the bend stiffness reduction of the bridge element.Starting with zero damage factor vector,the identification can be rea-lized based on the least-square method and the regularization technique with the measured bridge response time histories.Measurement noise and road surface roughness are considered in numerical simulations.Simulation results indicate that the proposed method is correct,the identified results are creditable and the damage identification can be performed conveniently.更多还原