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分别针对剪切模型和杆系防屈曲支撑模型,采用有限元软件OpenSEES整体时程分析方法,研究了试验子结构数量对子结构拟动力试验结果的影响。结果表明:随着试验子结构数量的增多,试验结果精度逐渐提高,呈现出近似二次抛物线形变化规律。在构件数量较多结构体系中,试验子结构数量较少时,子结构拟动力试验的精度不高,试验的意义不大。针对一个单跨两层带斜撑框架模型,基于OpenSEES进行虚拟子结构拟动力试验,采用最小二乘法,利用试验子结构观测数据,在线识别试验子结构的恢复力模型参数,并实时修正与试验子结构有相同恢复力特性的数值子结构恢复力模型。不同试验工况下试验结果对比表明:即使试验子结构数量受到限制,在子结构拟动力试验过程中,基于最小二乘法模型修正方法可以显著提高子结构拟动力试验的精度。
In this paper, the influence of the number of test sub-structures on the pseudo-dynamic test results of sub-structures is studied by using the finite element software OpenSEES integral time-history analysis method. The results show that with the increase of the number of experimental substructures, the accuracy of test results gradually increases, showing a law of approximately quadratic parabola. In the case of a large number of components, the accuracy of substructure pseudo-dynamic test is not high when the number of test substructures is small and the test is of little significance. Aiming at a single-span two-story model with bracing frame, a virtual sub-structure pseudo-dynamic test based on OpenSEES is carried out. Least square method is used to analyze the data of the test substructure structure, and the parameters of the restoring force model of the test substructure are identified online. Numerical substructure resilience model with same restoring force in substructure. The comparison of the test results under different test conditions shows that the method based on the least square method can significantly improve the accuracy of substructure pseudo-dynamic test in the pseudo-dynamic test of substructure even though the number of substructures is limited.