采用不同减震结构体系的RC框架结构地震易损性分析

Seismic fragility analysis of RC frame structure by different damping structural systems

采用消能减震技术能有效提高结构的抗震性能,而不同减震结构体系减震效果不同。为了评估不同减震结构体系下的抗震性能,本文以某6层RC框架结构为研究对象,采用基于增量动力分析法的地震易损性分析方法,分别研究了增设防屈曲约束支撑、软钢阻尼器、粘滞阻尼器3种不同减震结构体系的抗震性能。研究结果表明:在同一减震目标下,3种不同的减震结构体系均能有效控制结构的地震响应,其中防屈曲约束支撑结构在不同损伤状态下的超越概率最小,抗倒塌储备系数最大,说明该阻尼器的控制效果最佳,其次是软钢阻尼器,最后是粘滞阻尼器。

Using energy dissipation technology can effectively improve the seismic performance of the structure,and the damping effects of different damping structural systems are different.In order to evaluate the seismic performance of different damping structural systems,a 6-story RC frame structure is taken as the research object,and the seismic vulnerability analysis method based on incremental dynamic analysis is used to study the seismic performance of three different vibration-absorbing structure systems,such as buckling-Restrained Brace,Soft Steel Damper,Viscous Damper.The research results show that under the premise of meeting the same damping target,the three different damping structural systems can effectively control the seismic response of the structure,and the BRB has the smallest probability of overtaking under different damage conditions and the largest anti-collapse reserve coefficient.The BRB structure has the best control effect,followed by the SD structure and VD structure.