| 跨中作用下铝合金卷边工字形截面受弯构件稳定性能研究 |
| 投稿时间：2021-08-30 修订日期：2021-09-28 点此下载全文 |
| 引用本文：姜超,林冰.跨中作用下铝合金卷边工字形截面受弯构件稳定性能研究[J].计算机辅助工程,2021,30(4):. |
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| 中文摘要:为研究跨中作用下铝合金卷边工字形截面受弯构件的弹塑性稳定性能，采用有限元方法，分析腹板高厚比、翼缘宽厚比、卷边宽厚比、荷载作用点位置等参数对构件稳定性的影响。研究发现，构件屈曲模式与构件长度有关；腹板高厚比越大，稳定系数曲线越低，增大腹板高度有效提高承载力但相对承载能力下降；翼缘宽厚比越小，稳定性能越好；增加卷边宽度可提高卷边自身的抗弯刚度，对翼缘的约束作用进一步增强，从而提高稳定性；降低横向荷载作用点位置有利于构件保持稳定和提高承载力。根据有限元分析结果，验证了规范公式对此类截面受弯构件的适用性。 |
| 中文关键词:铝合金 受弯构件 弯扭失稳 稳定系数 有限元 |
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| Study on stability of aluminum alloy rolled edge I-section flexural member under mid-span action |
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| Abstract:In order to study the elastoplastic stability of aluminum alloy rolled I-section flexural member under mid-span action, the effects of web width-thickness ratio, flange width-thickness ratio, rolled edge width-thickness ratio and load position on the stability of the member were analyzed by using the finite element method. It is found that the buckling mode is related to the length of the member. The larger the ratio of height to thickness of web is, the lower the stability coefficient curve is. The smaller the flange width-thickness ratio is, the better the stability is. Increasing the width of the flanges can improve the bending stiffness of the flanges, and further enhance the constraint effect on the flanges, thus improving the stability. Reducing the position of lateral load is beneficial to maintaining stability and improving bearing capacity. According to the results of finite element analysis, the applicability of the code formula to the flexural members with this section is verified. |
| keywords:Aluminum alloy Flexural member Bending torsional buckling stability coefficient The finite element |
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