腹板开孔Σ形复杂卷边槽钢轴压承载力试验

doi:10.13229/j.cnki.jdxbgxb201503016

摘要/Abstract

摘要： 以不同截面形式的腹板开孔薄壁钢构件轴压性能为研究对象,分别对复杂卷边槽钢、Σ形复杂卷边槽钢两种截面形式,共10根腹板开孔轴压简支柱进行了承载力试验。试验结果表明,与相同用钢量下的腹板开孔复杂卷边槽钢相比,腹板开孔Σ形复杂卷边槽钢轴压构件的承载效率可提高30%~50%。与相同条件下的不开孔构件轴压试验相比,开孔构件的破坏模式基本不变,但破坏位置多发生在孔洞附近。利用有限元软件对试验进行模拟分析,模拟结果与试验结果吻合良好。以此为基础,采用有限元模拟对比了相同截面形式下腹板开孔和不开孔轴压构件的承载效率和应力云图,结果表明,与同截面的不开孔构件相比,腹板开孔复杂卷边槽钢的承载效率平均下降6.15%,腹板开孔Σ形复杂卷边槽钢的承载效率平均下降25.57%。孔洞的存在改变了构件的应力分布情况,较大应力区域和最大应力点均出现在孔洞附近。

关键词: 土木建筑结构, 腹板开孔, Σ, 形复杂卷边槽钢, 轴心受压

Abstract: The axial bearing capacity of thin-walled steel members with web holes and different section shapes are investigated. Ten simply supported compression members with two types of complicated sections, including channels with complex edge stiffeners and web holes, channels with complex edge stiffeners and Σ type web stiffeners and web holes, were tested. Results show that the axial compression loading efficiency of the Σ-section specimens with web holes can increase about 30% to 50% compared with channels with complex edge stiffeners and web holes under the same conditions. Compared with the specimens without holes, there is no change in failure modes, but the failure positions are near to the holes. Finite Element Analysis (FEA) is carried out to simulate the compression tests. FEA results agree well with the experimental data. Based on this, the load carrying efficiency and Von Mises stress distribution of channel columns with web holes are compared with those without holes by FEA. It is shown that the carrying efficiency of Σ-section models with holes decreases by 25.7% compared with the same section models without holes, while the model of channel section with complex edge stiffeners and holes decreases by 6.15% in average. Because of the perforations on the web, the positions of the stress concentration and the maximum stress change from the webs near the mid-height of the models to the locations adjacent to the holes.

Key words: civil engineering structure, web holes, channels with complex edge stiffeners and Σ, type web stiffeners, axial compression

中图分类号:

TU392.1

王春刚, 张壮南, 赵大千, 曹宇飞. 腹板开孔Σ形复杂卷边槽钢轴压承载力试验[J]. 吉林大学学报(工学版), 2015, 45(3): 788-796.

WANG Chun-gang, ZHANG Zhuang-nan, ZHAO Da-qian, CAO Yu-fei. Experimental investigation of Σ-section channel steel with complex edge stiffeners and web holes under axial compression[J]. 吉林大学学报(工学版), 2015, 45(3): 788-796.

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