波纹腹板H形钢梁受压翼缘宽厚比限值研究  

Research on allowable width-to-thickness ratio of compression flanges in H-shaped members with corrugated web

作　　者：李国强[1] 朱奇[2] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]同济大学土木工程学院,上海200092

出　　处：《建筑结构学报》2015年第7期91-98,共8页Journal of Building Structures

基　　金：国家"十二五"科技支撑计划项目(2012BAJ13B02)

摘　　要：考虑初始缺陷对翼缘弹塑性屈曲荷载的影响,设计了3组翼缘宽厚比不同的试件,对其进行承载力试验。结果表明:翼缘的初始缺陷显著降低了波纹腹板梁翼缘的弹塑性屈曲荷载。将3组试件极限荷载的有限元分析结果与试验结果进行对比。有限元分析结果表明,满足弹性设计公式的试件分别考虑翼缘初始几何缺陷、残余应力将降低弹塑性屈曲应力,降幅约28%、14%。综合试验及有限元分析结果,考虑初始几何缺陷、残余应力对翼缘弹塑性屈曲应力的影响,对弹性设计公式中的弹性模量取折减系数0.62,得到可供工程设计参考的翼缘宽厚比限值计算式,并给出了该计算式的适用范围,认为波纹腹板梁翼缘钢板的局部平面度偏差限值可放宽至2 mm。Three groups of specimens with different width-to-thickness ratio of flange were designed to consider the impact that the initial defect had on the elasto-plastic buckling stress of flange. Bearing capacity test of specimens was conducted. The results of the tests indicate that the initial defect causes a considerable reduction in the elasto-plastic buckling stress of flange in H-shaped members with corrugated web. The bearing capacity results of the FEA were compared with the results of three groups of specimens. The elasto-plastic buckling stress was reduced about 28% and 14% by the influence of the initial geometric imperfections and the residual stress in the flange of specimens that meet requirements of the elastic design formula. By reducing the modulus of elasticity about 0.62 for the influence of the initial geometric imperfections and the residual stress, rational limit value of width-to-thickness ratio is suggested for design based on the results of FEA and test results. Available range of the formula is also proposed. Requirements of local flatness error of the H-shaped members with corrugated web can be increased to 2 mm.

关 键 词：波纹腹板H形钢梁 局部屈曲 弹塑性屈曲应力 初始几何缺陷 残余应力 静力试验 受压翼缘宽厚比限值 

分 类 号：TU392.1[建筑科学—结构工程] TU311.41