滑移隔震结构的抗风稳定性分析

Analysis of wind resisting stability of a sliding isolation structure

滑移隔震结构要求在风荷载作用下保持安定。应用多种方法研究了不同摩擦系数、不同基本风压作用下滑移隔震体系的抗风稳定性:(1)考虑一阶振型的等效静力法;(2)采用谐波合成法模拟近似的具有给定功率谱密度函数的脉动风,作用于结构上,进行动力时程分析;(3)根据风压的功率谱密度函数计算脉动风压的概率法。研究结果表明时程分析法与概率法得到的风荷载相近,大于等效静力法得到的风荷载。摩擦系数为0.1可以满足基本风压小于0.90kN/m2地区滑移隔震结构的抗风稳定性。

It is required to keep stable for a sliding isolation structure under wind load. Several methods are applied to study the wind resisting stability of the sliding isolation wind pressures ： （ 1 ） equivalent static method considering turbulent wind is simulated by wave superposition method （3） probability method according to the function of power structure in different coefficients of friction and reference the 1^st mode;（2）transient dynamic analysis method that on the basis of given function of power spectrum density ; spectrum density. Numerical results show that wind loads obtained by the transient dynamic analysis method and the probability method are approximated, both are more than the wind load obtained by the equivalent static method. The sliding isolation structure with coefficient of friction being 0.1 can satisfy the wind resisting stability where the reference wind pressure is less than 0.90 kN/m^2.