【摘要】 以某高层框架-偏心支撑钢结构住宅为工程背景,采用有限元软件SAP2000建模,计算了罕遇地震下结构刚度、内力分布、振动模态及荷载-位移曲线等,并采用多条地震波分别对中心支撑和偏心支撑结构体系进行弹性时程及弹塑性时程的对比分析,比较了两种结构体系的动力特性及抗震性能.分析表明:高层框架-偏心支撑钢结构体系抗侧刚度能够满足结构抗侧移要求;反复地震作用下,偏心支撑结构体系耗能作用明显,结构动力响应小于中心支撑体系;罕遇地震作用下,偏心支撑结构进入塑性阶段后刚度衰减较小,仍能保持较高侧向刚度和承载力,表现出明显优于中心支撑体系的延性特征,抗震性能优于中心支撑体系.更多还原

【Abstract】 The eccentrically braced steel frame is a good moment-resisting system,widely used in high-rise structures,but its seismic performance in severe earthquake needs some in-depth study.This paper,based on an eccentrically braced high-rise apartment,with software SAP2000,has calculated the stiffness and stress distributions,the vibration modes and load-displacement curves etc.in severe earthquake,and it compared the dynamic/ aseismatic characteristics of eccentrically and centrally braced frames by elastic and elasto-plastic time history analyses.The analyses reveal that,the lateral stiffness of eccentrically braced highrise frames satisfies the requirements of lateral resistance;the eccentrically braced frames behaves better than centrally braced frames as the higher lateral stiffness and resistance in plastic stage in severe earthquake.更多还原