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为实现对隔震支座力学特性的精细化模拟,基于前期建立的结构精细化模拟分析平台RSAPS,结合可以考虑水平双向耦合作用的Bouc-Wen模型和考虑竖向刚度变化的双弹簧模型,开发了隔震单元分析模块。该模块采用重叠面积法确定给定侧向位移下的临界荷载;根据支座是否具有各项同性特性,选取相应的加卸载判断条件。应用该模块分别模拟分析了铅芯橡胶支座双向位移控制试验、双向激励振动台试验和缩尺隔震桥梁振动台试验,结果表明,基于RSAPS平台所开发的隔震单元模块,可以有效模拟隔震支座的静、动力特性,且具有较高的计算效率,可进一步应用于隔震桥梁的地震响应分析。
In order to realize the meticulous simulation of the mechanical characteristics of the isolated bearing, based on the pre-established structural refinement simulation analysis platform RSAPS, combined with the Bouc-Wen model which can consider horizontal bidirectional coupling and the double spring model which considers the variation of vertical stiffness, Isolation unit analysis module. The module uses the overlap area method to determine the critical load under a given lateral displacement. According to whether the support has the same-sex characteristics, the corresponding loading-unloading judgment conditions are selected. The module was used to simulate the bidirectional displacement control test of lead rubber bearing, two-way excited shaking table test and shaking table test of scale-isolating bridge respectively. The results show that the isolation unit module based on RSAPS platform can effectively simulate the isolation The static and dynamic characteristics of the bearing and its high computational efficiency can be further applied to the seismic response analysis of isolated bridges.