罕遇地震作用下的框架-摇摆刚架结构体系动力可靠度研究

Research on Dynamic Reliability of RC Frame with Rocking of Moment Frames under Strong Seismic Action

针对钢筋混凝土框架结构的受力特点,采用增设摇摆刚架的抗震设计方法,以提高罕遇地震下建筑结构的安全性。建立了框架-摇摆刚架结构体系的计算模型,结合状态空间法与虚拟激励法,求解结构的平稳随机响应,并根据计算所得随机响应对框架-摇摆刚架体系的动力可靠度进行分析。以西部地区某已建成的6层框架结构为算例,探讨了罕遇地震作用下不同刚度比的摇摆刚架对新结构体系动力可靠度的影响。结果表明,通过增设不同刚度比的摇摆刚架,可以有效协调结构体系的变形模式,充分发挥结构的耗能能力,降低整体结构的条件失效概率。

Based on the mechanical characteristics of RC frame structures, the seismic deslgn scheme with rocking of moment frames was used to improve the security of the building structure under strong seismic action. The calculation model of the structure system was formed and state space analysis method and pseudo excitation method were combining used to solve the stationary random response of the new structure system. And with the calculated random response the dy- namic reliability of RC frame with rocking of moment frames was analyzed. A 6-story RC frame in the western region was taken as the research object. The influence of the rocking of moment frames with different stiffness ratio to the dynamic reliability of the new structure system under strong seismic action was discussed by using the dynamic reliability theory. The results show that by adding rocking of moment frames with different stiffness ratio, structural system deform- ation modes can be effectively adjusted, the dissipation energy capacity of this structure may be increased and the conditional failure probability of the overall structure may be reduced.