采用环口板加强的K形圆钢管节点轴向承载力试验研究  

EXPERIMENTAL RESEARCH ON AXIAL BEARING CAPACITY OF CIRCULAR HOLLOW SECTION STEEL K-JOINTS REINFORCED WITH COLLAR PLATES

作　　者：李培阳 祝磊 LI Peiyang;ZHU Lei(Beijing Advanced Innovation Center for Future Urban Design,School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Higher Institution Engineering Research Center of Structural Engineering and New Materials,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京未来城市设计高精尖创新中心,北京建筑大学土木与交通工程学院,北京100044 [2]北京建筑大学,工程结构与新材料北京市高等学校工程研究中心,北京100044 [3]北京建筑大学,北京市建筑结构与环境修复功能材料重点实验室,北京100044

出　　处：《工业建筑》2020年第6期144-149,共6页Industrial Construction

基　　金：国家自然科学基金项目(51778035);北京未来城市设计高精尖创新中心资助项目(UDC2016030200)。

摘　　要：为探究采用环口板加强的K形圆钢管节点轴心承载性能,通过两组共4个K形圆钢管节点试件的轴向承载力试验,研究此类节点的变形和破坏情况;并对支管与弦管外径比β、环口板加强方式等因素对极限承载力的影响以及荷载-位移曲线进行分析。研究表明:节点变形和破坏表现为支管塑性变形、弦管局部凹陷、支管断裂和焊缝开裂;在加载初期,荷载值快速提高,随着作动器位移增大,荷载增长速度变缓,并出现峰值,随后荷载值开始下降;β和环口板加强对节点的极限承载力提高显著,极限承载力分别至少提高了35%和27%。To exploring axial bearing capacity of circular hollow section steel K-joints strengthened by collar plates,the axial loading tests of two groups,totally four circular hollow section steel K-joints were conducted,the deformation and failure modes of the joints were studied.The effects of the brace to the chord diameter ratioβand collar plate reinforcement methods on the ultimate strength and load-displacement curves were analyzed.The research showed that the deformation and failure modes of the joints were characterized by plastic deformation of braces,local dents of chords,and brace fractures and weld cracking.The load increased rapidly at the initial stage of loading.As the actuator displacement increased,the load growth rate became slower and then the peak appeared,after that the load began to decrease.The increase of theβand the collar plate reinforcement had an obvious improvement on the ultimate strength of the K-joint,and the ultimate bearing capacity were respectively increased by at least 35%and 27%.

关 键 词：K形圆钢管节点 环口板 轴向承载力 

分 类 号：TU392.3[建筑科学—结构工程]