高强方钢管轻骨料混凝土搭接K型节点试验  

Tests on lapped K-joints of lightweight aggregate concrete-filled high strength square steel tube truss

作　　者：赵东平 张洁洋 王万祯[1] 吴晓聪 ZHAO Dong-ping;ZHANG Jie-yang;WANG Wan-zhen;WU Xiao-cong(School of Civil and Environmental Engineering,Ningbo University,Ningbo 315211,China;Zhejiang Branch,China Aerospace Academy of Architectural Design&Research Co.,Ltd.,Hangzhou 310004,China)

机构地区：[1]宁波大学土木与环境工程学院,浙江宁波315211 [2]航天建筑设计研究院有限公司浙江分公司,浙江杭州310004

出　　处：《空间结构》2022年第4期81-86,共6页Spatial Structures

基　　金：浙江省公益技术研究计划(LGF18E08007);宁波市领军和拔尖人才工程项目

摘　　要：为考察支主管内浇灌轻骨料混凝土和支管搭接率(支管偏心率)对高强方钢管搭接K型节点受力性能的影响,对灌浆节点和空心节点进行了主管轴压静力加载试验,获得了搭接K型节点的破坏模式、承载力、节点区应变分布及演化.试验结果表明:支管搭接焊缝开裂是灌浆节点的典型破坏模式,空心节点的破坏模式为主管壁受压屈曲和支管搭接焊缝开裂;在支主管内浇灌轻骨料混凝土显著提高了搭接K型节点的承载力,灌浆节点的承载力较空心节点提高55.5%~80.5%;支管搭接率过大或过小均会降低搭接K型节点承载力.To study the effect of pouring lightweight aggregate(LWC)concrete into braces and chord and lap ratio of braces(eccentricity of braces)on the performance of lapped K-joints of high strength square steel tube truss,static loading tests under axial compression on chord were performed on lapped K-joints of LWC concrete-filled square steel tubes and lapped K-joints of hollow square steel tubes.The failure modes,bearing capacity,distribution and evolution of strain in connection zone of the tested K-joints were obtained.Test results show that the crack of lapped weld between braces is typical failure mode of the lapped K-joints of LWC concrete-filled square steel tubes,and buckling of chord walls in compression and the crack of lapped weld between braces are typical failure modes of the lapped K-joint of hollow square steel tubes.The bearing capacity of lapped K-joints is significantly improved due to pouring LWC concrete into braces and chord.The bearing capacity of lapped K-joints of LWC concrete-filled square steel tubes is 55.5%~80.5%higher than that of lapped K-joints of hollow square steel tubes.When the overlap ratio of brace is too large or too small,the bearing capacity of the lapped K-joints is reduced.

关 键 词：搭接K型节点 方钢管 轻骨料混凝土 试验 破坏模式 承载力 

分 类 号：TU392.3[建筑科学—结构工程]