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1 概述 拟动力技术又称计算机——加载器联机试验系统,该系统将计算机的动力分析与结构的静力试验合成一体,是评价结构抗震性能的一种最新试验手段。在此之前,结构抗震试验主要采用低周反复荷载下的静力试验和振动台试验两种方法,但存在着伪静力试验真实性差和振动台试验费用高、模型小及振动过程短的缺点。相比较而言,拟动力试验具有以下明显优越性。 1.1 在计算结构地震反应时,引用实测的恢复力,反映了该时刻结构的真实刚度,更能准确地反映地震时结构的真实状态。 1.2 每步加载的控制位移可以看作是结构在地震荷载下的真实反映,因此它以静力加载方式实现结构动态反应历史。
1 Overview Pseudo-dynamic technology is also called the computer-loader online test system. This system combines the dynamic analysis of the computer with the static test of the structure and is a new test method to evaluate the seismic performance of the structure. Before this, the seismic test of the structure mainly used the static test and the shaking table test under low cyclic reversed load. However, there were disadvantages such as the poor authenticity of the pseudostatic test, the high cost of the shaking table test, the small model, and the short vibration process. . In comparison, the pseudo-dynamic test has the following obvious advantages. 1.1 When calculating the seismic response of a structure, reference to the measured restoring force reflects the true stiffness of the structure at that moment, and can more accurately reflect the true state of the structure during the earthquake. 1.2 The control displacement at each step of loading can be regarded as a true reflection of the structure under seismic loading. Therefore, it uses the static loading method to realize the dynamic response history of the structure.