【摘要】 基于利于结构安装和抗震修复以及屈曲约束支撑的特点,采用梁柱铰接钢框架承受竖向荷载、屈曲约束支撑抵抗水平荷载的结构体系,并推导了这种结构体系的楼层弹性和弹塑性抗侧刚度.采用双线性模型模拟屈曲约束支撑的滞回性能,采用时程分析方法分析了屈曲约束支撑铰接钢框架结构体系的抗震性能、弹性及弹塑性地震反应特征.结果表明:多遇地震下,结构楼层位移反应基本呈线性关系,层间位移角分布比较均匀;罕遇地震下会出现薄弱层现象,但各层支撑都会屈服耗能.除底层以外,楼层剪力主要由支撑承担,而底层框架柱承担的楼层剪力比例会增大;框架梁和柱在各级地震下都处于弹性状态;屈曲约束支撑铰接钢框架结构体系具有较好的抗震性能.更多还原

【Abstract】 Based on the easy construction and seismic rehabilitation of building,reduction of seismic disaster,the hinge-connected steel frame with buckling restrained braces was proposed.The proposed structure system was composed of a hinge-connected main frame,which was designed to remain elastic under earthquake action,and buckling restrained braces resisting all lateral loads.Generalized the seismic behavior experiments of buckling restrained braces,the test results showed that the bilinear hysteresis model can be used.The story elastic lateral stiffness and elaso-plastic lateral stiffness of this structure system was derived.By time-history analysis method,the seismic behavior of hinge-connected steel frame with buckling restrained braces was analyzed.The results showed that the maximum story drift curves of the proposed structure system were close to linear lines and the maximum inter-story drifts are relatively uniform under frequent seismic action.There exits weak story in this structure under severe seismic action,but the braces in every story can dissipate earthquake energy.Most floor seismic shear was carried by braces from second to sixth story.In the first story,the floor seismic shear carried by column was increased compared with that in other story.The beam and column remain elastic under seismic load.The proposed structure can satisfy seismic requirements and coincide with the preliminary design objectives by reasonable structural design.更多还原