屈曲约束支撑的动力稳定性分析

屈曲约束支撑一般由内核构件和外包构件组成,使支撑构件在反复荷载作用下屈服而不屈曲。基于此原理,现提出的屈曲约束支撑包括纯钢型和混凝土型,对于这两种屈曲约束支撑型式的力学性能研究,目前主要集中在静力稳定性能,但屈曲约束支撑主要用于地震作用下的振动控制,因此利用解析法对纯钢型和混凝土型屈曲约束支撑的动力稳定性进行了研究,推导出了该支撑的临界频率和动力不稳定边界,分析了外包构件的刚度对其动力稳定性的影响,并提出了减小该支撑振动的一些措施。

Dynamic Stability Analysis of Buckling Restrained Brace

The buckling restrained brace(BRB) consists of a kernel steel component and a peripheral restrictive one,the kernel steel component will not buckle but yield under repeated axial loading.Based on the principle,two types of BRB,i.e.,the pure steel and the concrete are proposed,the mechanic study of these two kinds of BRBs was focused on their static stability at present.Since BRB is mainly used in vibration control under earthquake action,so the dynamic stability of two kinds BRB was studied with analytical method,the critical frequency and dynamic instability border of BRB were derived;the influence of outer component stiffness on the dynamic stability was analyzed,and some measure was proposed for diminishing the brace vibration.