Experimental study on overall stability behavior of welded I-section steel beams with longitudinally profiled flanges

被引：0

作者：

Liu X. ^{[1
]}

Wang Y. ^{[1
]}

Xu D. ^{[1
]}

Ban H. ^{[1
]}

Liu M. ^{[2
]}

机构：

[1] Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Tsinghua University, Beijing

[2] Product Development Department, Anshan Iron & Steel, Anshan

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2022年 / 43卷 / 05期

关键词：

Elastic critical moment; I-section steel beam; Lateral-torsional buckling; Longitudinally profiled steel plate; Stability reduction factor; Thickness changing rate;

D O I：

10.14006/j.jzjgxb.2021.0448

中图分类号：

学科分类号：

摘要：

To investigate the overall stability behavior of welded I-section steel beams with longitudinally profiled (LP) flanges, eleven LP beams and two counterparts with constant thickness were designed and tested on a setup with no lateral restraint, including three-point and four-point loading, as well as five kinds of thickness changing rate (0, 2, 4, 6, 8 mm/m). The results show that all specimens fail with elasto-plastic lateral-torsional buckling and have significant residual deformation after unloading. The influence of varied thickness on bearing capacity is much more obvious for LP beams under three-point loading than that for beams under four-point loading. The design methods and buckling curves for beams with uniform thickness were summarized. Referring to the finite element numerical analysis, the elastic critical moment of LP beams decreases with the increase of flange thickness change rate. When the stability curves in uniform thickness beam design standard is prepared be applied for LP beams, the FE analysis or approximate calculation with average section dimension is recommended to get the elastic critical moment of LP beams. Compared with design based on the critical mid-span section, a relatively conservative moment is obtained. Finally, the test results were compared with the design values, the results show that BS EN 1993-1-1 is the safest, followed by GB 50017-2017, and ANSI/AISC 360-16 is the least safe. The overall stability design method of LP beams needs further study. © 2022, Editorial Office of Journal of Building Structures. All right reserved.

引用

页码：1 / 12

页数：11

共 22 条

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