Lateral instability of elliptical hollow section beams
Lateral instability of elliptical hollow section beams
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DOI：
10.1016/j.engstruct.2011.12.008
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发表时间：
2012-04
影响因子：
5.5
通讯作者：
K. Law;L. Gardner
中科院分区：
文献类型：
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作者：
K. Law;L. Gardner
研究了椭圆形空心截面构件在受弯时的侧向失稳问题。八个横向不受约束的EHS梁，具有恒定的横截面纵横比为2，进行了三点弯曲试验。本文报告了试验装置、材料性能、截面几何形状、残余应力测量和试验样本的全载荷-变形响应。为了补充实验数据，还开发了数值模型，并根据试验结果进行了验证。然后进行参数研究，以评估横截面的长宽比和构件细长度对横向稳定性的影响。基于装配式结构性能数据，建立了椭圆形空心截面梁的侧扭屈曲曲线，并进行了统计验证。也有人提出了一个极限长度，在此长度之下不需要考虑侧向扭转屈曲（LTB）。
Lateral instability of elliptical hollow section (EHS) members in bending is studied in this paper. Eight laterally unrestrained EHS beams, with a constant cross-sectional aspect ratio of two, were tested in three-point bending. The test set-up, material properties, section geometry, residual stress measurements and full load-deformation responses of the test specimens are reported herein. To supplement the experimental data, numerical models were also developed and validated against the test results. Parametric studies were then performed, to assess the influence of cross-sectional aspect ratio and member slenderness on lateral stability. Based on the assembled structural performance data, lateral torsional buckling curves for elliptical hollow section beams have been developed and statistically verified. Limiting lengths below which lateral torsional buckling (LTB) need not be considered have also been proposed.