腹板开孔复杂卷边槽钢轴压构件稳定性能研究

发布时间：2018-06-16 07:22

  本文选题：腹板开孔 + 复杂卷边槽钢　； 参考：《沈阳建筑大学》2014年硕士论文

【摘要】：随着新型截面形式的出现以及超薄、高强钢材的应用,带来了许多新的稳定问题,如不同截面形式受压构件的局部、畸变和整体相关屈曲下的极限承载力问题,以及相应屈曲模式对构件变形性能的影响问题等。同时,随着构件截面形式的复杂化,畸变屈曲将对构件的极限承载力起到控制作用。目前,国内外对不开孔冷弯薄壁型钢轴压构件的研究已较为成熟,而对开孔轴压构件还有待深入研究。且开孔构件的研究多集中在普通卷边槽钢截面上,对复杂卷边开孔轴压构件的研究较为少见。针对目前的研究现状,本文以不同截面形式的腹板开孔薄壁钢轴压构件为研究对象,分别对复杂卷边槽钢、∑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。研究了此类复杂截面轴心受压构件的极限承载力、失稳模式及变形等特性。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∑形复杂卷边槽钢轴压构件的承载效率可提高30%～50%左右。与相同条件下的不开孔轴压构件变形相比,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ANSYS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∑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。此外,改变翼缘宽度、板材厚度、构件长度等参数,对共36根变参数开孔构件进行模拟分析研究。研究结果表明,翼缘宽度的增大会加大应力云图中翼缘的较大应力范围。板材厚度的增加会加大开孔构件孔洞处的变形幅度。构件长度的改变会影响构件的屈曲半波长度,进而改变构件的失稳模式。同时,研究了国外计算特定截面形式开孔构件极限承载力的DSM法,并采用此计算方法计算了18个腹板开孔复杂卷边槽钢截面构件的极限承载力,发现计算结果与模拟结果较为接近。拓展了DSM计算方法的适用范围。
[Abstract]:With the emergence of new cross-section and the application of ultra-thin and high-strength steel, many new stability problems have been brought about, such as the local, distortion and ultimate bearing capacity of different cross-section compression members under the whole dependent buckling. And the influence of the corresponding buckling mode on the deformation performance of the member, and so on. At the same time, with the complication of section form, distortion buckling will control the ultimate bearing capacity of members. At present, the research of cold-formed thin-walled steel axial compression members without opening holes has been more mature, but the axial compression members of open-hole axial compression members need to be further studied. The research of perforated components is mostly focused on the section of common crimped channel steel, and the research on complicated crimping perforated axial compression members is rare. In view of the present research situation, this paper takes the thin-walled steel axial compression members with different cross-section forms as the research object, respectively for the complicated crimped channel steel and 鈭，

本文编号：2025876