梯形钢屋架不同计算模型屈曲分析的探讨  

DISCUSSION ON BUCKLING ANALYSIS OF TRAPEZOIDAL STEEL ROOF TRUSS BY DIFFERENT COMPUTING MODELS

作　　者：王昌胜 索小永 李胜英 WANG Chang-sheng;SUO Xiao-yong;LI Sheng-ying(School of Civil Engineering and Architecture,Anhui Polytechnic University,Wuhu 241000,China)

机构地区：[1]安徽工程大学建筑工程学院,安徽芜湖241000

出　　处：《南阳理工学院学报》2020年第2期71-74,102,共5页Journal of Nanyang Institute of Technology

基　　金：安徽省优秀青年访学项目(gxfx2017041);安徽省高等教育提升计划自然科学研究项目(TSKJ2016B26);安徽工程大学校青年基金项目(2015YQ09)。

摘　　要：传统梯形钢屋架在工程分析中按铰接来计算,实际节点多为刚接,对计算结果有一定影响。本文分别建立了刚接梯形屋架和铰接梯形屋架,通过改变截面大小实现杆件长细比的变化,进行了大量屈曲承载力计算,对计算结果进行分析,发现长细比大时二者承载力基本相同,随着长细比减小刚接梯形屋架屈曲承载力明显高于铰接梯形屋架;而且随长细比变小,二者结构自重占结构总承载力比例逐渐减小。所以,从提高结构效率的角度出发,结构设计时应有意识地控制杆件长细比,不宜过大。The traditional trapezoidal steel roof truss is calculated by articulation in engineering analysis. The actual joints are mostly rigid joints, which has a certain influence on the calculation results. In this paper, rigid trapezoidal roof truss and articulated trapezoidal roof truss are established respectively. By changing the section size, the slenderness ratio of members is changed. A large number of buckling bearing capacity calculations are carried out. The results of calculation are analyzed. It is found that the bearing capacity of the two roofs is basically the same when the slenderness ratio is large. With the decrease of slenderness ratio, the buckling bearing capacity of rigid-jointed trapezoidal roof truss is obviously higher than that of articulated trapezoidal roof truss. In addition, with the decrease of slenderness ratio, the proportion of self-weight to total bearing capacity of structure decreases gradually. From the point of view of improving structural efficiency, the slenderness ratio of rigid-jointed trapezoidal roof truss should be consciously controlled design so as not to be too in structural.

关 键 词：刚接 铰接 计算模型 屈曲承载力 

分 类 号：TU3[建筑科学—结构工程]