支主管夹角对X形圆钢管节点平面外受弯性能影响  

EFFECT OF THE BRACE-TO-CHORD ANGLE ON THE OUT-OF-PLANE FLEXURAL BEHAVIOR OF UNSTIFFENED CHS X-JOINTS

作　　者：赵必大[1] 蔡扬政 王伟[2,3] ZHAO Bi-da;CAI Yang-zheng;WANG Wei(College of Civil Engineering and Architecture,Zhejiang University of Technology,Hangzhou,Zhejiang 310023,China;State key laboratory for Disaster Prevention in Civil Engineering,Shanghai 200092,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310023 [2]同济大学土木工程防灾国家重点实验室,上海200092 [3]同济大学土木工程学院建筑工程系,上海200092

出　　处：《工程力学》2019年第7期99-108,共10页Engineering Mechanics

基　　金：浙江省自然科学基金项目(LY16E080012)

摘　　要：应用于单层网壳结构的X形圆钢管相贯节点往往具有支主管平面内非正交、平面外夹角的几何特征。为了研究支主管平面内、平面外夹角对节点平面外受弯性能的影响,进行了支主管平面内夹角不同的两个X形节点试件的平面外受弯滞回性能试验、以及理论研究和有限元分析。研究结果表明:两个节点均表现出较好的抗震性能和变形能力,节点主要依赖主管管壁的塑性变形以及开裂后裂缝扩展来耗能;支主管平面内夹角较小时,节点域主管管壁的塑性发展更加缓慢、均匀,节点具有更高的承载力和抗震性能;支主管平面外夹角导致节点平面外抗弯弹性刚度和反向抗弯承载力降低、但增强了节点的正向抗弯承载力。Unstiffened circular hollow section(CHS)tubular X-joints,which are widely applied to single-layer reticulated shell structures,usually have the geometric characteristics of non-orthogonal in-plane angle(IPA)and non-zero out-of-plane angle(OPA)between brace and chord.To investigate the effect of the IPA and OPA on the out-of-plane flexural behavior of the X-joints,an experiment on two unstiffened CHS X-joints with different IPA under cyclic out-of-plane bending moment(OPBM)were performed,and theoretical analysis and finite element(FE)analysis were also conducted.It indicated that two joints behave excellently in deformability and seismic resistance,and the energy dissipated of the X-joints mainly rely on plastic deformation and crack propagation of the chord wall.The results also shown that the X-joints with smaller IPA have higher flexural capacity and better seismic behavior than X-joints with larger IPA,because more uniform plastic development and slower growth strain at the chord wall near to intersection for the former joints.OPA reduces the flexural elastic stiffness and the flexural capacity of the X-joints under reverse OPBM.However,OPA is conducive to strengthening the flexural capacity of the X-joints under positive OPBM.

关 键 词：X形圆钢管相贯节点 支主管平面内夹角 支主管平面外夹角 平面外抗弯性能 延性与耗能 

分 类 号：TU392.3[建筑科学—结构工程]