节点性能对分层装配支撑钢框架抗震性能的影响研究

THE EFFECTS OF JOINT BEHAVIOR ON THE SEISMIC PERFORMANCE OF FLOOR-BY-FLOOR ASSEMBLED STEEL BEAM-THROUGH BRACED FRAMES

该文以分层装配梁贯通式支撑钢框架为对象,通过引入节点弯矩-转角本构模型的数值模拟方法,研究节点刚度和承载力设置对结构体系抗震性能的影响。分析结果表明,节点刚度对结构自振频率影响不大,但影响结构在静力推覆下的失效演进模式和地震作用下的滞回特性,节点刚度小于4倍相邻柱线刚度时,结构不能满足罕遇地震下的层间位移角限值要求;节点承载力对静力推覆下结构的极限承载力影响很小,对罕遇地震作用下的结构滞回特性和层间位移分布几乎没有影响。

This paper presents a research on floor-by-floor assembled steel beam-through braced frames. By introducing a numerical simulation method of the moment-rotation constitutive model of joints, the influence of the joint rigidity and strength on the seismic performance of the structure system is studied. The analysis results indicate that the impact of the joint rigidity on the structure’s frequency of vibration is small. Structures with different joint rigidities have different failure modes under the static pushover. The hysteretic behavior of the structure is closely related with the rigidity of joints. When the rigidity of joints is smaller than four times of the line rigidity of columns, the structure’s maximum story drift ratio cannot satisfy the limit under severe earthquakes required by the present Chinese codes. Meanwhile, the strength of the joints slightly affects the structure ultimate strength under the static pushover and has little influence on the hysteretic behavior and story drift distribution of the structure under severe earthquakes.