近场地震下隔震结构基底发生碰撞的鲁棒易损性曲线计算

发布时间：2018-01-18 03:27

本文关键词：近场地震下隔震结构基底发生碰撞的鲁棒易损性曲线计算　出处：《工程力学》2014年01期 　论文类型：期刊论文

【摘要】：用凸集模型模拟隔震结构参数(如刚度、质量、支座的屈服力和屈服后刚度等)的不确定性,而用随机模型模拟地震动输入的不确定性,提出了计算近场地震作用下在考虑双不确定性因素时隔震结构基底发生碰撞的易损性曲线计算新方法;提出了鲁棒易损性曲线的新概念,计算结果将给隔震支座力学参数的设计以及基底与限位墙之间空隙宽度的选取提供参考;通过计算实例中基底最大位移敏感度分析发现,上部结构的质量和隔震支座的力学参数(如屈服力、屈服后刚度等)对基底最大位移影响较大,而上部结构的刚度对其影响不大;此外,该文的研究内容也为考虑结构参数和输入地震动双不确定性因素的情况下,计算各类结构地震易损性曲线提供了一种新的思路和途径。
[Abstract]:The uncertainty of isolated structure parameters (such as stiffness, mass, yield force and post-yield stiffness) is simulated by convex set model, while the uncertainty of ground motion input is simulated by stochastic model. A new method for calculating the vulnerability curve of the base of isolated structure under the action of near-field earthquake is proposed. A new concept of robust vulnerability curve is proposed. The calculation results will provide a reference for the design of mechanical parameters of the isolation bearing and the selection of the gap width between the base and the limiting wall. It is found that the mass of superstructure and the mechanical parameters of isolation support (such as yield force, yield stiffness, etc.) have a great influence on the maximum displacement of the base through the analysis of the sensitivity of the maximum displacement of the base in the example of calculation. The stiffness of superstructure has little effect on it. In addition, this paper also provides a new way to calculate the seismic vulnerability curves of various structures considering the double uncertainty factors of structural parameters and input ground motion.
【作者单位】：华中科技大学土木工程与力学学院;华中科技大学控制结构湖北省重点实验室;
【基金】：国家自然科学基金项目(51078166,51278213) 中央高校基本科研业务费专项资金项目(2012TS006)
【分类号】：TU435
【正文快照】： 基础隔震结构能有效地减小地震作用下上部结构的相对位移和内力,但在强烈的近场地震(特别是包含长周期的速度脉冲)作用下,隔震支座将发生很大的位移[1 2],存在着基底与四周限位墙或其它非结构构件发生碰撞的风险。实际上,在1994年美国的Northridge地震中,Los Angeles一栋基础

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