邓露, 钟玉婷, 杨远亮, 刘艳芝. 冷弯薄壁型钢受弯构件承载力与延性优化研究[J]. 工程力学, 2021, 38(4): 93-101. DOI: 10.6052/j.issn.1000-4750.2020.05.0327
引用本文: 邓露, 钟玉婷, 杨远亮, 刘艳芝. 冷弯薄壁型钢受弯构件承载力与延性优化研究[J]. 工程力学, 2021, 38(4): 93-101. DOI: 10.6052/j.issn.1000-4750.2020.05.0327
DENG Lu, ZHONG Yu-ting, YANG Yuan-liang, LIU Yan-zhi. OPTIMIZATION ON BEARING CAPACITY AND DUCTILITY OF COLD-FORMED THIN-WALLED STEEL FLEXURAL MEMBER[J]. Engineering Mechanics, 2021, 38(4): 93-101. DOI: 10.6052/j.issn.1000-4750.2020.05.0327
Citation: DENG Lu, ZHONG Yu-ting, YANG Yuan-liang, LIU Yan-zhi. OPTIMIZATION ON BEARING CAPACITY AND DUCTILITY OF COLD-FORMED THIN-WALLED STEEL FLEXURAL MEMBER[J]. Engineering Mechanics, 2021, 38(4): 93-101. DOI: 10.6052/j.issn.1000-4750.2020.05.0327

冷弯薄壁型钢受弯构件承载力与延性优化研究

OPTIMIZATION ON BEARING CAPACITY AND DUCTILITY OF COLD-FORMED THIN-WALLED STEEL FLEXURAL MEMBER

  • 摘要: 该文旨在通过改变冷弯型钢的截面尺寸来提高其承载力和延性。基于ABAQUS有限元软件建立已有试验模型,计算了不同尺寸下的腹板翼缘加劲截面和腹板加劲的折叠翼缘截面的抗弯承载力及延性,分析了上述2种截面的几何尺寸与抗弯承载力及延性的关系,并采用人工神经网络(ANNs)和遗传算法(GA)对截面尺寸进行优化;采用逼近理想解排序法(TOPSIS)分别确定了2种截面的最佳截面尺寸并提出截面尺寸的优化设计公式。结果表明:对壁厚为1.5 mm的冷弯薄壁型钢构件,在一定范围内增加截面腹板高度可以提高其抗弯承载力,采用较小的平翼缘宽度可以提高其延性,设置加劲肋的措施可以略微增加结构抗弯承载力但显著提高结构延性;在所研究的截面中,腹板加劲的折叠翼缘截面具有更好的力学性能。

     

    Abstract: It aims to improve the bearing capacity and ductility of CFS members by changing the cross-sectional dimensions. An experimentally validated model generated in finite element code ABAQUS is utilized to study the flexural capacity and ductility of channel with web and flange stiffeners and configuration with web stiffener and folded flanges in different section dimensions. Then, the relationships between the section dimensions and optimization criterions (flexural capacity and ductility) are analyzed respectively, and geometrical dimensions of these sections are optimized using ANNs (artificial neural networks) and GA (genetic algorithm). The optimal section dimensions are obtained by TOPSIS (technique for ordering preferences by similarity to ideal solution) and the formulas for designing optimally section dimensions are presented. For the cold-formed thin-walled steel member with the thickness of 1.5 mm, it is demonstrated that: bearing capacity can be improved by increasing the web height in a certain range, and ductility can be improved by using smaller flat flange width, the measure of adding stiffeners can slightly increase the flexural capacity and significantly increase the ductility. Configuration with web stiffener and folded flanges has better mechanical properties among the studied cross sections.

     

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