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

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (15) : 90-97.

论文

吴倩芸1 何文福1 刘文光1 于维欣1 秦川1

作者信息 +

Large Deformation Hardening Model for Leading Rubber Bearings and Elastic-plastic Analysis on Isolation Structure

WU Qianyun1, HE Wenfu1 , LIU Wenguang1 , QIN Chuan1

Author information +

文章历史 +

摘要

对直径为600mm和1100mm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

Having large deformation horizontal shear experiment on the LRB600 and LRB1100 which the shear deformation is 400%, it shows that the stiffness of bearings becomes greater when the shear deformation is 240%, the hardening stiffness increases with the increase of shear deformation, and it has a 1.5-fold increased when shear deformation is 400%. According to the test results, a new multi linear model which considers the hardening effect is proposed and used in Perform-3D. The elastic-plastic analysis is carried out on the structure in different earthquake intensity, the leading rubber bearings adopt traditional bilinear model and multiple linear hardening model respectively to comparing the seismic response, elastic-plastic response spectrum and the plastic energy dissipation of the structure, verifying the adverse influence of the bearings hardening. Analysis indicates that the hardening of bearings could weaken the isolation effect in major earthquake, the acceleration of upper structure increases by 30%~50%, and the plastic energy dissipation of the structure goes higher, the upper structure enter into the plastic deformation condition. Research result show that the seismic response of the structure can be underestimated without considering the effect of bearings hardening in isolation design.

导出引用

吴倩芸1 何文福1 刘文光1 于维欣1 秦川1 . 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[J]. 振动与冲击, 2017, 36(15): 90-97

WU Qianyun1, HE Wenfu1,LIU Wenguang1,QIN Chuan1. Large Deformation Hardening Model for Leading Rubber Bearings and Elastic-plastic Analysis on Isolation Structure[J]. Journal of Vibration and Shock, 2017, 36(15): 90-97

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