橡胶支座与柱串联体系的动力特性分析

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (17) : 134-139.

论文

橡胶支座与柱串联体系的动力特性分析

杜永峰，林治丹，李慧

作者信息 +

Dynamic characteristics of serial system of bearing with column

DU Yong-feng , LIN Zhi-dan ，Li Hui

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文章历史 +

摘要

针对工程界比较关注的橡胶隔震支座与柱串联的隔震体系，研究了串联隔震体系横向振动的固有频率，探讨了轴向压力和不同隔震支座等效弯曲刚度对串联隔震系统固有频率的影响。考虑横截面转动和剪切变形以及轴向压力的影响，建立了串联隔震系统横向自由振动的数学模型；采用微分求积单元法（DQEM）对所得控制方程和边界条件进行离散处理，避免了繁琐的偏微分方程求解；数值求解固支—自由边界条件下串联隔震体系的横向固有频率，并得到该系统横向固有频率参数随压力变化的曲线。数值结果表明：轴向力的增加将显著降低串联隔震系统的低阶固有频率；在总高度一定的情况下，隔震支座尺寸的增大对串联隔震体系的力学特性也有显著的影响。

Abstract

According to the serial system of bearing with column, the natural frequency of serial system is investigated, and the effects of axial load and different rubber bearings are discussed. Taking into account the effects of the cross-section rotation, shear distortion and compression axial force, the mathematical model for free vibration of the system is established. The differential quadrature element method is employed for the discrete processing in governing equations and boundary conditions. The natural frequency of serial system with clamped-free boundary conditions is solved numerically, and the figures of natural frequency with compression axial force are presented. It is shown that the axial force will reduce the lower order natural frequencies significantly, and in certain case of total height, the equivalent bending stiffness of rubber bearings reduces the natural frequencies to different extent.

导出引用

杜永峰;林治丹;李慧. 橡胶支座与柱串联体系的动力特性分析[J]. 振动与冲击, 2012, 31(17): 134-139

DU Yong-feng;LIN Zhi-dan;Li Hui. Dynamic characteristics of serial system of bearing with column[J]. Journal of Vibration and Shock, 2012, 31(17): 134-139