预制梁端削弱连接的型钢-混凝土组合节点静力性能分析

Analysis of the static performance of prefabricated steel-concrete composite joints connected by weakened beam ends

为研究单调荷载作用下不同梁端削弱形式对新型型钢-混凝土组合节点受力性能的影响,借助ABAQUS有限元软件,对9个不同梁端削弱形式的节点模型进行受力性能分析,研究梁端削弱构造对节点破坏形态、承载能力、初始刚度以及延性的影响。结果表明:所有节点破坏形式均满足“强柱弱梁”的抗震要求,梁端翼缘削弱后,节点的承载力影响较小,但节点初始刚度下降28.5%,延性系数提高10.6%;梁端腹板削弱后对节点力学性能的影响很小,主要原因是腹板削弱直径相对于腹板截面高度较小,削弱效果不明显;梁端翼缘和腹板同时削弱后,节点承载力有一定提高,节点初始刚度下降,延性系数提高,但随着腹板削弱孔径增大,节点延性系数下降17.4%,而节点刚度提高19.5%。

With the help of ABAQUS finite element software,the mechanical performance of nine different beam end weakened joints was analyzed to study the influence of different beam end weakening forms on the node destruction forms,bearing capacity,initial stiffness and ductility of the new concrete composite joint under monotonic load.The results show that all joint failure modes meet the seismic requirements of“strong column and weak beam”.The bearing capacity of the joint is less affected when the beam end flange is weakened,but the initial stiffness of the joint reduces by 28.5%,and the ductility coefficient increases by 10.6%.When the beam end web is weakened,the impact on the mechanical properties of the joint is inconspicuous.The main reason is that the weakened diameter of the web is smaller than the height of the web interface,and the weakening effect is not obvious.When the beam end flange and the web are weakened at the same time,the bearing capacity of the joint improves to a certain extent,the initial stiffness of the joint decreases,and the ductility coefficient increases.However,as the weakened aperture of the web increases,the joint ductility coefficient decreases by 17.4%,while the joint stiffness increases by 19.5%.