空间效应影响下KX型圆钢管相贯节点极限承载力研究  

Research on ultimate bearing capacity of circular steel tubular KX-joints under space effect

作　　者：王秀丽[1] 郗文科[1] 杨文伟[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《空间结构》2011年第4期33-38,共6页Spatial Structures

基　　金：国家自然科学基金资助项目(50968014)

摘　　要：应用双重非线性有限元对空间效应影响下的KX型圆钢管相贯节点进行了广泛的数值分析,分别获得了几何效应和荷载效应影响下节点的破坏模式与极限承载力.不同支腹杆轴力比下引起空间KX节点发生弦杆管壁局部屈曲破坏模式的原因主要有三种,即轴力比较小为负、较大为负和轴力比为正时.根据不同几何参数下节点极限承载力的变化规律,对于几何尺寸相同的弦杆与腹杆,支杆截面越大,对节点域刚度的贡献作用就越大,节点极限承载力的提高幅度也越大;支腹杆轴力比一定时,支杆的管径越小,对节点的极限承载力越不利.工程设计中空间KX型节点的支腹杆截面尺寸不应相差过大.With the method of double nonlinear finite element, the circular steel tubular KX-joints was widely investigated numerically under space effect. The failure modes and ultimate capacity of KX-joints were obtained respectively by geometric effect and load effect. There are three reasons for the failure modes of KX-joints under the different axial force ratio of the X branch to K branch, which are the axial force ratio lesser for negative, larger for negative, and for positive. According to the change rule of the ultimate strength through different geometric parameters analysis, under the same size of chord and K- branch, the section area of X-branch is the larger, the stiffness of KX-joints is the greater and the bearing capacity is the higher. The diameter of X branch is the smaller, the ultimate capacity of KX-joints is the worse when the axial force ratio of the branch is certain. In actual construction design, the section size of X branch and K branch of multi-planar KX-joints should not vary too much.

关 键 词：空间KX型圆钢管相贯节点 空间效应 破坏模式 极限承载力 

分 类 号：TU392.3[建筑科学—结构工程]