Calculation method of flexural-torsional buckling ultimate moment for simply supported steel beams based on stability factor of columns

被引：0

作者：

Liu Z. ^{[1
,2
]}

Song S. ^{[2
]}

Ma Z. ^{[3
]}

Zhou X. ^{[4
]}

机构：

[1] Key Laboratory of Mechanics on Disaster and Environment in Western China, the Ministry of Education of China, Lanzhou University, Lanzhou

[2] College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou

[3] Gansu Science and Technology Construction Group Co., Ltd, Lanzhou

[4] School of Civil Engineering, Chongqing University, Chongqing

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2024年 / 45卷 / 04期

关键词：

critical moment; flexural-torsional buckling; simply supported steel beam; stability factor of column; ultimate moment;

D O I：

10.14006/j.jzjgxb.2023.A005

中图分类号：

学科分类号：

摘要：

In order to deal with the existing problems for the application range and accuracy of the design approach for flexural-torsional buckling (FTB) ultimate moment in current design standard, formula of elastic critical moment for steel beams governed by FTB was proposed on the basis of elastic critical loads of columns subjected to global buckling. Furthermore, the calculated method for FTB ultimate moment was also proposed on the basis of stability factor of columns. The FTB experimental results of 124 rolled, 80 welded and two girder I-section beams (a total number of 206 specimens) were employed to evaluate the application range and accuracy of the proposed method. The results were compared with the design approach in GB 50017—2017 ‘Standard for design of steel structures’ . The results show that, for the considered 206 specimens, the proposed method is of wider application range than GB 50017—2017 and comparative accuracy compared with the results in the existing literature. For the seven singly symmetric I-sections specimens, the proposed method is accurate and slightly safe, but the design approach in GB 50017—2017 is unsafe. For the 44 singly I-section specimens under load cases which are not included in GB 50017—2017, the mean and standard deviation of ratio of the results determined by the proposed method to experimental results, are 0. 908 and 0. 125 respectively, indicating the proposed method is accurate and safe. © 2024 Science Press. All rights reserved.

引用

页码：166 / 176

页数：10

共 33 条

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