平面KK型矩形钢管节点静力试验研究  

Study on static test of planar KK⁃type rectangular hollow section steel joints

作　　者：陈元坤[1,2] 李宏胜 何波[3] 陈晓强 张满辉[4] 朱爱珠 CHEN Yuankun;LI Hongsheng;HE Bo;CHEN Xiaoqiang;ZHANG Manhui;ZHU Aizhu(Central-South Architectural Design Institute Co.,Ltd,Wuhan 430071,China;School of Civil and Architectural Engineering,Wuhan University,Wuhan 430072,China;Wuhan Urban Railway Construction Investment&Development Co.,Ltd.,Wuhan 430071,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]中南建筑设计院股份有限公司,武汉430071 [2]武汉大学土木建筑工程学院,武汉430072 [3]武汉城市铁路建设投资开发有限责任公司,武汉430071 [4]华中科技大学土木与水利工程学院,武汉430074

出　　处：《建筑结构》2024年第12期35-42,109,共9页Building Structure

基　　金：国家自然科学基金(52078230);湖北省博士后创新实践岗位(第一批)。

摘　　要：依托某主题广场月牙形艺廊单层网壳钢屋架结构,选取其最不利受力节点,设计了中心插板节点和毂节点两种KK型矩形钢管节点,分别对其足尺模型进行静载试验,测试分析模型节点区域的应变及应力分布规律,对比分析支管端部的位移变化。结果表明:1)设计荷载水平下,两个节点均满足受力要求;毂节点和中心插板节点的最大试验荷载约为等效设计荷载的2.85倍和3.25倍,节点安全储备较高;2)在最大试验荷载作用下,两个节点支管根部与中心构件相贯焊缝附近部分均不同程度地屈服,毂节点圆筒内加劲肋焊缝局部出现开裂;3)相同荷载作用下,中心插板节点相应位置应力应变水平相对较低,故中心插板节点的承载强度较高;4)由试验荷载-位移曲线分析得出毂节点的各肢平均位移比中心插板节点约大13.3%,表明中心插板节点弹性刚度较大。Based on the single-layer reticulated shell steel roof of a theme square crescent gallery,a typical joint with the most unfavorable stress were selected,and two KK-type RHS(rectangular hollow section)steel joints,i.e.,the center plate joint and the hub joint were designed.The two full-scale models were conducted static load and tested.The strain and stress distribution law in the joints area of the models were measured and analyzed,and the deformations at the end of the branch tubes were also measured and comparatively analyzed.The results show that:1)Under the design load level,both joints meet the strength deign requirement;and the maximum test loads of the hub joint and the center plate joint are respectively about 285 and 325 times of the equivalent design load.The two joints have high safety redundancy.2)Under the action of the maximum test load,the root of both nodal branches exhibited varying degrees of yielding in the vicinity of the coherent weld with the center member.The weld of one stiffener in the cylinder of the hub joint is partially cracked.3)Under the action of the same load,the measured stresses and strains of the center plate joint is relatively lower than those of the hub joint,so the bearing strength of the center plate joint is relatively higher.4)According to the measured load-deformation curve,the average displacement of each tube of the hub joint is about 133%larger than that of the central plate joint,which indicates that the central plate joint has higher elastic stiffness.

关 键 词：KK型矩形钢管节点 中心插板节点 毂节点 足尺模型试验 承载力 

分 类 号：TU392.3[建筑科学—结构工程]