X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 of CHS X-joints

作　　者：赵必大 林时康 陈界佑 吴双双[1] 李福龙 陈镒 ZHAO Bida;LIN Shikang;CHEN Jieyou;WU Shuangshuang;LI Fulong;CHEN Yi(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：《西安建筑科技大学学报（自然科学版）》2022年第4期517-523,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：浙江省自然科学基金项目(LY20E080020)。

摘　　要：为了研究X形圆钢管节点平面内受弯滞回性能,进行了两个节点在往复平面内弯矩作用下的试验研究.结果表明:两个节点的破坏模式均为相贯线附近焊缝热影响区的主管管壁开裂,开裂前主管管壁经历显著的塑性发展;节点表现出良好的滞回性能;主管管壁塑性变形和开裂后的裂纹扩散成为节点的主要耗能模式,尽管支管根部的塑性变形对耗能也有贡献.对比支主管正交节点(支主管夹角90°),支主管斜交节点(支主管夹角非90°)具有更高的抗弯承载力,并且具有更好的延性和耗能能力.当支主管斜交且夹角较大(大于70°)时,夹角正弦的倒数能较好地反映了支主管斜交对节点承载力的有利影响.To study the in-plane flexural hysteretic behavior of unstiffened circular hollow section(CHS)X-joints,an experimental test on two CHS X-joints with different brace-to-chord angle(BCA)under cyclic in-plane moment(IPM)were performed.The results show that the failure modes of both joints are cracking of the chord wall in the heat affected zone of the weld near the intersecting line,and the chord wall undergoes significant plastic deformation before cracking.Two X-joints behave excellently in hysteretic behavior.The plastic deformation of the chord wall and the crack propagation after cracking become the main energy consumption modes of the joint,although the plastic deformation of the branch pipe root also contributes to the energy consumption.In contrast,the X-joints with brace-to-chord skew(i.e.,BCA is not 90°)have better ductility and higher flexural capacity and energy consumption capacity than the X-joints with brace-to-chord orthogonal(i.e.,BCA is 90°).For the X-joints with brace-to-chord skew but larger BCA(larger than 70°),the reciprocal of the sine of BCA can reflects the beneficial influence of brace-to-chord skew on the in-plane flexural capacity.

关 键 词：X形圆钢管相贯节点 平面内受弯滞回性能 平面内抗弯承载力 延性 耗能 

分 类 号：TU391[建筑科学—结构工程]