软钢-滚动隔震支座的力学性能分析

Mechanic property analysis of mild steel-rolling isolation bearing

针对大跨空间结构的结构特点和纯滚动隔震体系的不足,提出软钢-滚动隔震支座,并根据隔震支座的受力特点,建立软钢的力学分析模型;依据赫兹接触理论,计算滚珠静载荷下的特征参数。同时,运用有限元软件ANSYS模拟隔震支座的静荷载作用下力学特征和滞回特性,获得其主要力学性能参数,并与所建立力学分析模型及赫兹理论进行对比分析,二者基本一致。分析结果表明,本支座具有良好的受力性能和理想的滞回耗能性能,滚珠滞回耗能性能很低。

According to the characteristics of large-span spatial structure and the shortcoming of pure rolling isola- tion system, a concept design of Mild Steel-Rolling Isolation （MSRI） bearing is put forward in this paper. The me- chanical model is established on the basis of the stress characteristics. The characteristic parameters of rolling under static load are calculated on the basis of Hertz contact theory. Meanwhile, the mechanical characteristics of the bearing under static loads and hysteretic characteristics are numerically simulated by the FEM ANSYS to obtain the main mechanical parameters of this bearing. These parameters are in good agreement with the results from the es- tablished theoretical model. It is indicated that the theoretical model is agreeable to the FEM analysis. In brief, it is shown that the bearing shares good mechanical properties and ideal hysteretic characteristics.