XK型相贯节点极限承载力研究及空间效应对极限承载力的影响  

Study on ultimate bearing capacity of XK-type intersecting joints and the influence of spatial effect on ultimate bearing capacity

作　　者：何响 阳勇 黄政华[1] HE Xiang;YANG Yong;HUANG Zhenghua(School of Civil Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550025

出　　处：《湖南文理学院学报（自然科学版）》2024年第2期78-88,共11页Journal of Hunan University of Arts and Science(Science and Technology)

基　　金：国家自然科学基金项目(51368009);贵州省科技计划项目(黔科合基础[2018]1036)。

摘　　要：为了研究XK型相贯节点极限承载力及空间效应对极限承载力的影响,运用嵌入SWDM模型的VUSDFLD子程序对7个XK型节点进行有限元分析,通过分析支杆轴力与腹杆轴力比n_(xk)对XK型节点极限承载力的影响和空间XK型节点与相同参数的平面K型节点相比极限荷载的变化情况来分析荷载效应和几何效应对于XK型相贯节点极限承载力的影响,并分析XK型节点支杆与弦杆外径之比β_(x)、弦杆管径与壁厚之比γ、腹杆间隙a对节点极限承载力的影响。结果表明:XK型节点的极限承载力随着β_(x)的增大而增大,随着γ的增大而减小,随着腹杆间隙a的增大而增大;随着n_(xk)的增加,XK型节点支杆无论承受的是压力还是拉力,节点的极限承载力均会减小;当XK型节点支杆管径和弦杆壁厚较大时,n_(xk)对节点极限承载力影响不大,空间XK型节点与相同参数的平面K型节点相比极限承载力会有所提高。To explore the ultimate bearing capacity of XK-type intersecting nodes and the effect of load effect on the ultimate bearing capacity,a finite element analysis is conducted on 7 XK-type nodes by VUSDFLD subroutine with embedded SWDM model.The influence of the ratio n_(xk)of strut axial force to web axial force on the ultimate bearing capacity of XK-type nodes,and the change of ultimate load carrying capacity of space XK-type nodes compared with that of plane K-type nodes with the same parameters are studied to analyze the influence of load effect and geometric effect on the ultimate bearing capacity of the XK-type node,and to analyze the effect of the ratio of the outer diameter of strut to that of chordβ_(x),the ratio of chord diameter to wall thicknessγ,and the web gap a on the ultimate bearing capacity of the nodes of XK-type nodes.The results show that:the ultimate bearing capacity of the XK-type node increases with the increase ofβ_(x),decreases with the increase ofγ,and increases with the increase of the web gap a.With the increase of n_(xk),the ultimate bearing capacity of the node decreases no matter the XK-type node stanchion is subjected to pressure or tension,and n_(xk)has little effect on the node's ultimate bearing capacity when the XK-type node stanchion diameter and chordal bar wall thickness are larger,and the ultimate load carrying capacity of space XK-type nodes increases compared with that of plane K-type nodes with the same parameters.

关 键 词：极限承载力 空间效应 相贯节点 子程序 

分 类 号：TU392.3[建筑科学—结构工程]