新型橡胶隔震支座临界行为理论模型研究

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摘要橡胶隔震支座在地震作用下同时受到巨大轴力与剪切变形，易发生稳定性问题进入临界状态，现行设计方法及计算理论不能准确计算临界力及临界位移，严重威胁隔震结构安全。为此本文提出计算橡胶支座临界行为新型理论模型，根据支座进入临界状态时受力规律，以两层竖向弹簧模拟支座转动性能，非线性水平弹簧模拟剪切性能，建立力学模型对支座临界行为进行分析。通过与试验结果进行对比，表明建立的理论模型能够准确模拟橡胶支座的临界行为，解决了现存分析模型中需要依靠试验校正系数以及误差过大的问题，为隔震结构设计提供有力工具。

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	孙新阳
	杨维国
	王萌

关键词 ：橡胶支座, 水平刚度, 稳定性, 临界力, 力学模型, 有限元分析

Abstract：Rubber seismic isolation bearings are subjected to large axial loads and lateral displacements at the same time during earthquakes, and they are prone to turn into critical state. The current design methods and calculation theories cannot calculate the critical forces and the corresponding displacements accurately, which poses a direct threat to the isolated structures. Therefore, a new theoretical model that could simulate the critical behavior of rubber bearings is proposed in this study. According to the mechanics regularity of bearings in critical state, the rotational behavior of rubber is represent by two groups of vertical springs, and the shear behavior is modeled by a nonlinear horizontal spring, a mechanical model is established to analyze the critical behavior of rubber bearings. By comparing with test curves, the results show that the model has the ability to simulate the critical behavior of rubber bearings with ideal accuracy. It could tackle the problems that need to rely on experimentally calibrated parameters or have considerable errors of existing models, and it is able to provide a powerful tool for isolated structures design.

Key words： rubber bearing horizontal stiffness stability critical load mechanical model finite element analysis

收稿日期: 2016-02-14 出版日期: 2017-05-15

引用本文:

孙新阳,杨维国,王萌. 新型橡胶隔震支座临界行为理论模型研究[J]. 振动与冲击, 2017, 36(10): 7-12.
SUN Xin-yang, YANG Wei-guo, WANG Meng. A new theoretical model of rubber bearings for simulating critical behavior. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(10): 7-12.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I10/7

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