基于缩尺模型的离线模型更新混合试验方法

Hybrid simulation of off-line model updating based on scale model

为进一步提高模型更新混合试验的操作性,扩展其应用范围,提出了基于缩尺试验子结构的离线模型更新混合试验方法。文中通过对缩尺试验子结构的识别后参数进行相似处理,更新至数值子结构,并保留数值子结构参数、运动方程等与原型相同,达到模型更新目的,完成整个混合试验;对试验子结构不同缩尺比例以及离线模型更新方法中框架层数、不同待更新构件选取策略进行对比研究。利用OpenSees进行以IMK为恢复力模型的柱构件低周反复加载试验模拟,通过Matlab编制模拟退火算法程序进行参数识别。对1榀2层2跨的钢筋混凝土框架进行混合试验数值仿真,验证了文中所提方法的正确性和可行性,为结构抗震混合试验的更新策略选取提供参考。

In order to further improve the operability of the model update hybrid test and expand its application range,an offline model update hybrid test method based on the scaled test substructure is proposed.In this paper,the model updating purpose is achieved by similarly processing the identified parameters of the scaled-down test substructure and updating to the numerical substructure,and keeping the numerical substructure parameters and equations of motion the same as the prototype to complete the whole hybrid test;a comparative study is conducted on different scaling ratios of the test substructure as well as the number of frame layers and different selection strategies of the components to be updated in the offline model updating method.OpenSees is used to simulate the low circumferential repeated loading test of column members with IMK as the restoring force model,and the simulated annealing algorithm program is prepared by Matlab for parameter identification.Numerical simulation of hybrid test on a reinforced concrete frame with two stories and two spans verifies the correctness and feasibility of the method proposed in this paper,and provides a reference for the selection of the update strategy of the seismic hybrid test of the structure.