隔震桥梁模型更新混合试验数值模拟

Numerical simulation of hybrid testing with model updating for seismic isolated bridge

为检验隔震桥梁结构抗震性能,以三跨隔震连续桥为对象进行模型更新混合试验数值模拟,通过OpenSees有限元软件建立隔震桥梁数值模型,给出模型更新在OpenSees软件中的实现方法,采用AUPF算法在线识别并更新数值子结构中隔震支座模型参数,得到三种场地类别地震激励下桥梁结构的地震反应,分析桥梁的墩顶位移、支座位移、墩底剪力以及墩顶加速度的误差。结果表明,采用AUPF算法的模型更新混合模拟结果与结构真实地震反应吻合良好,Cape Mendocino地震激励下墩顶加速度的相对均方根误差最大,小于2.5%,验证了隔震桥梁模型更新混合试验数值模拟的有效性和准确性。

This paper aims to test the seismic performance of the seismic isolated bridge structure by taking three-span seismic isolated bridge as the object to perform numerical simulations of the model updating hybrid testing.The study involves establishing a numerical model of the seismic isolated bridge using OpenSees finite element software;identifying the implementation of the model updating in the OpenSees software;identifying and updating the model parameters of isolation bearings of numerical substructures on line and obtaining the seismic responses of the bridge structure from seismic excitation under three different site category;and analyzing the errors of pier top displacement,support displacement,pier bottom shear and pier top acceleration.The results show that the hybrid simulation results and structure of model updating using AUPF algorithm are in better agreement with the real seismic response;and the relative root mean square error of pier top acceleration under Cape Mendocino seismic excitation is the largest and less than 2.5%,as which verifies the validity and accuracy of the hybrid testing method with model updating.