铅芯橡胶隔震支座大变形硬化模型及隔震结构弹塑性分析研究

发布时间：2018-05-16 20:04

本文选题：支座硬化 + 地震动响应　；参考：《振动与冲击》2017年15期

【摘要】：对直径为600 mm和1100 mm的铅芯橡胶支座进行了剪切变形400%的水平大变形剪切试验,试验结果表明支座在240%剪切变形后发生屈服后刚度增大现象,且硬化刚度随剪切变形的增大而增大,400%剪切变形时刚度硬化增加到1.5倍。根据试验结果进一步提出了一种考虑硬化效应的铅芯橡胶支座多线性大变形硬化恢复力模型,并将此模型用于Perform-3D软件中。对8层隔震结构进行不同地震烈度下的弹塑性分析,支座分别采用传统双线性模型与多线性大变形硬化模型,对比分析结构的地震动响应、弹塑性反应谱以及塑性耗能情况。结果表明在大震下隔震支座硬化隔震效果减弱,上部结构加速度增加30%~50%,结构塑形耗能增加,上部结构进入塑性变形状态。研究结果表明隔震设计中大震验算不考虑支座硬化效应会低估结构地震反应。
[Abstract]:The shear deformation of the lead rubber bearing with diameter of 600mm and 1100 mm was tested with a horizontal deformation of 400%. The experimental results show that the stiffness of the bearing increases after yielding after 240% shear deformation. The hardening stiffness increases with the increase of shear deformation and increases to 1.5 times with 400% shear deformation. Based on the experimental results, a multi-linear large deformation hardening restoring force model of lead rubber bearing considering hardening effect is proposed and applied to Perform-3D software. The elastoplastic analysis of 8-story isolated structure with different seismic intensity is carried out. The traditional bilinear model and the multilinear large deformation hardening model are used to analyze the seismic response, the elastic-plastic response spectrum and the plastic energy dissipation of the structure respectively. The results show that the hardening isolation effect of the isolation support is weakened, the acceleration of the superstructure increases by 30% and 50%, the energy consumption of the structure is increased, and the superstructure enters into the plastic deformation state. The results show that the seismic response of the structure can be underestimated if the bearing hardening effect is not taken into account in the large earthquake checking calculation in the isolated design.
【作者单位】：上海大学土木工程系;
【基金】：国家自然科学基金(51308331;51278291)
【分类号】：TU352.12

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