基于RSAPS平台的隔震单元模型

RSAPS-BASED ISOLATION ELEMENT MODEL

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。

To simulate the mechanical properties of seismic isolation bearings precisely, an isolation element model is developed based on the previously-built RSAPS simulation platform. The model combines the Bouc-Wen model that considers bi-lateral coupling effect with the two-spring model that considers vertical stiffness variation. The critical load at a given lateral displacement is determined using the overlapping area method. The loading/unloading condition is chosen depending on the isotropic behavior of the isolation bearing. A bi-lateral displacement-controlled test, a shaking table test of lead-rubber bearings under bi-lateral seismic excitations and a shaking table test of a scaled isolated bridge are simulated using the proposed model on RSAPS. The results show that the static and dynamic behavior of seismic isolation bearings can be simulated with high computational efficiency by the proposed model on RSAPS. The model can be applied to analyses of the seismic response of isolated bridge structures.