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采用有限元软件ABAQUS对节点域箱形加强式工字形柱弱轴连接普通节点和腹板开孔型节点进行有限元分析,研究了开孔参数、轴压比、钢材强度对节点域箱形加强式工字形柱弱轴连接腹板开孔型节点滞回性能的影响。分析结果表明:在循环荷载作用下,在弹性阶段节点腹板开孔参数对节点骨架曲线影响不大;进入弹塑性阶段后,开孔参数对节点的承载力影响较大,其中开孔直径对节点的滞回性能影响最大,开孔位置次之;轴压比对节点的滞回性能基本无影响;随着钢材强度的提高,节点的屈服承载力和极限承载力随之也提高,并且其延性也在降低,中强度钢材可以满足延性的要求,因此可以通过提高钢材的强度来提高节点的抗震性能。另外提出了一种适用于弱轴连接的加强型与腹板开孔型并用的新型节点。通过有限元分析发现新型节点能够综合加强型节点与腹板开孔型节点的优点,实现塑性铰外移和增加使用功能的要求,有效地保护节点,达到“强节点弱构件”的目的,具有一定的工程应用价值。
The FEA software ABAQUS was used to analyze the box-shaped reinforced box-shaped I-shaped weak axis connection of common shaft axis and web open-hole type nodes. The influence of hole parameters, axial compression ratio, Effect of Inertial Weft Linkages on Hysteretic Behavior of Open Joints with Web. The analysis results show that under the cyclic loading, the parameters of the web openings in the joints have little effect on the joint skeleton curve. After entering the elasto-plastic stage, the open hole parameters have a great influence on the bearing capacity of the joints, The hysteretic behavior of the joint has the greatest effect and the position of the open hole is the second. The axial compression ratio has almost no effect on the hysteretic behavior of the joint. As the strength of the steel increases, the yield strength and the ultimate bearing capacity of the joint also increase, Ductility is also reduced, the strength of the steel can meet the requirements of ductility, so you can improve the strength of the steel to improve the seismic performance of the node. In addition, a new type of node which is suitable for the combination of weak axis connection and web hole opening is proposed. Finite element analysis shows that the new type of node can comprehensively strengthen the advantages of typed joints and webs with open webs, achieve the requirement of plastic hinge to move outwards and increase the use of functions, and effectively protect the joints to achieve the purpose of “strong joints and weak members” , Has a certain value of engineering application.