International Journal of Steel Structures ( IF 1.1 ) Pub Date : 2021-07-30 , DOI: 10.1007/s13296-021-00522-w Chengzhong Gui 1 , Junqing Lei 2 , Chaoyi Xia 2 , Weiwei Lin 3 , Zhi Duan 4
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Abstract
The present work investigates the static performance and stability of the thin-walled plates with flat stiffeners under uniform compression. An experiment was first performed to investigate the effects of the steel thin-walled box beam-column with intermediate flat stiffeners on the static performance and stability. The test proved that the external flange could enhance the static load-carrying capacity, but the external flange's local buckling predominantly affects the members' buckling performance. The theoretical solution of the stiffened plates can be focused on improving the buckling performance. The ideal formula for calculating the stiffened flange's elastic buckling coefficient with three simply-supported edges and one stiffened edge is derived based on the potential energy method. The elastic constraint coefficients between the stiffener and the stiffened plate are also introduced and fitted by regression with the 95% confidence interval's verification to consider the effects of the boundary condition and double-sided arrangement of the stiffeners. The effects of the stiffness ratio between the stiffeners and the stiffened plates and the geometry parameters of the stiffened plates and the stiffeners on the buckling coefficients have been analyzed. Based on the results, the simplified equations suitable for determining the buckling coefficients for the plates with the four simply-supported edges, and the three simply-supported edges, and one free/elastic stiffened edge, are also suggested. Research shows that the calculating results of the modified equations are in good agreement with that of the finite element method, which is also applicable to the stiffened flange without stiffeners.
Graphic Abstract
中文翻译：
平面法兰加筋板的静力性能及弹性屈曲分析
摘要
目前的工作研究了在均匀压缩下具有扁平加强筋的薄壁板的静态性能和稳定性。首先进行了试验，研究了带中间平加劲肋的钢薄壁箱形梁柱对静力性能和稳定性的影响。试验证明，外法兰可以提高静承载能力，但外法兰的局部屈曲主要影响构件的屈曲性能。加筋板的理论解决方案可以集中在提高屈曲性能上。基于势能法推导出了三简支边一加筋边加筋翼缘弹性屈曲系数的理想计算公式。还引入了加劲肋与加筋板之间的弹性约束系数，并通过回归拟合与95%置信区间的验证，以考虑加劲肋的边界条件和双面布置的影响。分析了加筋板与加筋板的刚度比、加筋板与加筋板的几何参数对屈曲系数的影响。在此基础上，还提出了适用于确定具有四个简支边、三个简支边和一个自由/弹性加劲边的板的屈曲系数的简化方程。研究表明，修正方程的计算结果与有限元方法的计算结果吻合较好，
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