十字形圆钢管节点平面内受弯滞回性能试验研究  

Experimental study on the in-plane flexural hysteretic behavior ofunstiffened circular hollow section cross-type joints

作　　者：赵必大 张睿泽 吴双双[1] 周航杰 黄禛哲 李福龙 ZHAO Bida;ZHANG Ruize;WU Shuangshuang;ZHOU Hangjie;HUANG Zhenzhe;LI Fulong(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学土木工程学院,浙江杭州310023

出　　处：《浙江工业大学学报》2023年第2期139-145,共7页Journal of Zhejiang University of Technology

基　　金：浙江省自然科学基金资助项目(LY20E080020)。

摘　　要：为研究十字形圆钢管节点的面内受弯滞回性能,进行了2个支主管直径比不同的节点在平面内往复弯矩作用下的试验研究。研究结果表明:节点以主管管壁的塑性变形和裂纹扩展为主要耗能方式,加载后期的支管根部塑性变形对耗能也有一定贡献;节点破坏模式为节点域主管管壁经历较大塑性发展后撕裂,节点的变形能力和延性较好;节点的荷载—位移滞回曲线饱满,表现出良好的滞回特性。试验所得节点的抗弯承载力比规范计算值提高了17%~23%,通过对比中等节点和较大节点的支主管直径比,发现较大节点的主管管壁塑性发展更为均匀,抗弯承载力更高,耗能更大,延性更好。In order to study the in-plane flexural hysteretic behavior of circular hollow section(CHS)cross-type joints,two joint specimens with different brace-to-chord diameter ratios are tested under a cyclic in-plane bending moment.The results show that the energy dissipation of joints mainly depends on the plastic deformation of the chord wall and the crack propagation after cracking and the plastic deformation of the root section of the braces also contributes to the energy consumption at the later stage of loading.The failure mode of both specimens are the tearing of the chord wall in the joint-zone after the chord wall undergoes a greater plastic deformation.The two specimens have good deformability and ductility.The results also show that the load-displacement hysteretic curve of the two specimens are full,showing good hysteretic characteristics.The flexural strength of the specimens are 17%to 23%higher than that predicted by the specification.Compared with those with medium brace-to-chord diameter ratios,joints with large ratios exhibit a more uniform plastic development in the joint-zone,a higher flexural strength,a better energy dissipation capacity and a better ductility ratio.

关 键 词：十字形圆钢管 节点 直径比 承载力 塑性应变 

分 类 号：TU317[建筑科学—结构工程]