摘要
为了研究钢框架异型节点的抗震性能以及节点两侧梁的截面高度比和轴压比对核心区抗剪承载力的影响,对6个"强构件弱节点"型式的异型节点进行了低周反复加载试验,获得了异型节点的破坏模式、滞回性能和承载能力。理论分析和试验结果表明,异型节点在加载过程中上核心区先发生屈服,紧接着下核心区屈服,最终破坏模式有4种;异型节点下核心区对上核心区有约束作用,使得上核心区屈服以后,其所受的剪力仍可以增大,直到下核心区屈服;常规节点核心区的抗剪承载力计算公式对异型节点核心区已不适用。根据试验结果,推导了异型节点核心区的抗剪承载力计算公式。
Six specimens in 1/4 scale of the prototype model,which were designed according to the principle of strong-member and weak-connection,were tested under low-cyclic reversed loading to study the seismic performance of abnormal joint.The effect of the section height ratio of beams and the axial compression ratio on the shear capacity of the panel zone was analyzed.The failure mode,hysteretic performance and bearing capacity were obtained.Theoretical analysis and experimental results show that,the top panel zone yields prior to the bottom panel zone,and the specimens fail in 4 failure modes.The bottom panel zone of abnormal joint has restraint on the top panel zone,which makes the shear force that the yielded top panel zone suffers still be increased until the bottom panel zone yields.The calculating formula of shear capacity of normal joint panel zone does not fit for abnormal joint panel zone.Based on the experimental results,the calculating formula of shear capacity of abnormal joint panel zone is derived.
出处
《地震工程与工程振动》
CSCD
北大核心
2010年第5期37-41,共5页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(50978217)
中国博士后科学基金项目(20080440814)
关键词
钢框架
异型节点
核心区
受剪机理
抗剪承载力
steel frame
abnormal joint
panel zone
shear mechanism
shear capacity
