新型开洞圆钢管混凝土柱-混凝土梁连接节点受力性能研究  

Study on mechanical performace of new circular concrete⁃filled steel tube column⁃concrete beam connection joints with openings

作　　者：周陈发 黄佩雯 吴兴修 ZHOU Chenfa;HUANG Peiwen;WU Xingxiu(Guangzhou City Construction&Development Design Institute Co.,Ltd,Guangzhou 510620,China)

机构地区：[1]广州城建开发设计院有限公司,广州510620

出　　处：《建筑结构》2024年第16期39-45,99,共8页Building Structure

摘　　要：传统的钢-混凝土混合结构的圆钢管混凝土柱-混凝土梁连接节点存在钢筋交错、纵横向需与钢构件避让或开孔等情况,节点构造复杂,施工难度较大,连接节点成为钢-混凝土混合结构的设计及施工难点。对此提出了新型开洞圆钢管混凝土柱-混凝土梁连接节点,并结合近年来采用钢-混凝土混合结构的项目经验,对该类节点进行有限元分析,研究了柱顶轴压力和柱端水平力对节点各部分构件受力性能的影响,结果表明,柱顶轴压力的变化显著影响了圆钢管混凝土柱钢管开洞位置各构件的应力,且偏心力对圆钢管混凝土柱承载力有一定的折减。最后考虑到钢管壁开洞对圆钢管混凝土柱存在一定程度的削弱,采用了四种加强措施,分析了四种加强措施下钢管荷载-应力曲线,结果表明,开洞位置钢管壁加厚效果最为显著,设置内环板对缓解应力集中效应也有一定的效果,设置竖向断开加劲肋与设置竖向连续加劲肋荷载-应力曲线基本一致,考虑到设置竖向断开加劲肋所需钢材更少,认为设置竖向断开加劲肋具有较为显著的优越性。The circular concrete⁃filled steel tube column⁃concrete beam connection joint of traditional steel⁃concrete hybrid structure has the situation that the steel bar crisscrossed needs to avoid or open the hole with the steel member,the joint structure is complex,the construction is difficult,and this joint becomes the design and construction difficulty of steel⁃concrete hybrid structure.So,the new circular concrete⁃filled steel tube column⁃concrete beam connection joint was proposed,and combining with the project experience of adopting steel⁃concrete hybrid structure in recent years,the finite element analysis of this kind of joint was carried out.The influence of axial pressure at the top of the column and horizontal force at the end of the column on the mechanical properties of each part of the joint was studied.The results show that the change of axial pressure at the top of the circular concrete⁃filled steel tube column significantly affects the stress of each member at the steel pipe openings,and the off⁃center force reduce the bearing capacity of the circular concrete⁃filled steel tube column.At last,considering a certain degree of weakening of circular concrete⁃filled steel tube columns by steel tube wall openings,four types of strengthening measures were adopted,and the load⁃stress curves of steel tubes under those measures were analyzed.The result show that thickening the wall of steel tube at the location of the openings is the most effective way.Setting up the inner ring plate is also effective in reducing the stress concentration effect.The load⁃stress curves of the circular concrete⁃filled steel tube column with vertical disconnected stiffeners are basically the same as those with vertical continuous stiffeners,the installation of vertical disconnected stiffeners have more significant advantages because of the less steel requirement.

关 键 词：钢管混凝土柱 柱-梁连接节点 开洞圆钢管 加强措施 

分 类 号：TU398.9[建筑科学—结构工程]