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首页> 外文期刊>International journal of structural stability and dynamics >Elastic Critical Moment of Lateral-Distortional Buckling of Steel-Concrete Composite Beams under Uniform Hogging Moment
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Elastic Critical Moment of Lateral-Distortional Buckling of Steel-Concrete Composite Beams under Uniform Hogging Moment

机译：均匀悬挂时刻钢混凝土复合梁横向扭曲屈曲的弹性关键时刻

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摘要

Great attention has been given in the last few years to steel-concrete composite beams due to the gains in strength that can be obtained with the small cost of installing a shear connection between the steel profile and the concrete slab. In continuous and semicontinuous composite beams close to the internal supports, hogging bending moments are developed and the compressed bottom flange may buckle laterally in an unstable way known as the lateral-distortional buckling, characterized by a horizontal displacement and twist of the bottom flange with an out-of-plane distortion of the web. In the literature, several formulations were proposed to determine the critical moment for this type of buckling. Among them, some of the most relevant are presented by [K. Roik, G. Hanswille and J. Kina, Solution for the lateral torsional buckling problem of composite beams (in German), Stahlbau 59 (1990)] and [G. Hanswille, J. Lindner and D. Munich, Lateral torsional buckling of composite beams (in German), Stahlbau 67 (1998)]. In the present work, a new procedure is developed to determine the elastic critical moment of lateral-distortional buckling of composite beams under uniform hogging moment. To assess and calibrate this procedure, 7 772 numerical models were analyzed by the finite element code ANSYS and the results were compared with the ones obtained from the new proposed formulas. The procedure presented excellent agreement with the numerical results, with an average deviation of 2.33% from the computational simulations. The formulations of [K. Roik, G. Hanswille and J. Kina, Solution for the lateral torsional buckling problem of composite beams (in German), Stahlbau 59 (1990)] and [G. Hanswille, J. Lindner and D. Munich, Lateral torsional buckling of composite beams (in German), Stahlbau 67 (1998)] did not lead to such satisfactory results, presenting an average deviation of 12.41% and 16.51%, respectively.
机译：在过去的几年中，由于强度的增长，在最近几年内给出了极大的注意，这是通过在钢型材和混凝土板之间安装剪切连接的少量成本来获得的力量。在靠近内部支撑件的连续和半连续的复合梁中，开发出摇动弯矩，压缩的底部凸缘可以以不稳定的方式横向缠绕为横向扭曲屈曲，其特征在于水平位移和底部法兰的弯曲网上的外平面失真。在文献中，提出了几种配方来确定这种屈曲的关键时刻。其中，[K.]中，一些最相关的一些最相关的Roik，G. Hanswille和J. Kina，复合梁横向扭转问题的解决方案（以德语），Stahlbau 59（1990）]和[G. Hanswille，J. Lindner和D.慕尼黑，复合梁的横向扭转扣（德语），Stahlbau 67（1998）]。在本作工作中，开发了一种新的程序，以确定均匀的摇动力矩下复合梁的横向扭曲屈曲的弹性临界力矩。为了评估和校准该程序，通过有限元码ANSYS分析7 772个数值模型，并将结果与​​从新的所提出的公式中获得的结果进行比较。该程序与数值结果呈现出优秀的一致性，平均偏差为计算模拟2.33％。 [K. Roik，G. Hanswille和J. Kina，复合梁横向扭转问题的解决方案（以德语），Stahlbau 59（1990）]和[G. Hanswille，J. Lindner和D.慕尼黑，复合梁的横向扭转屈曲（德语），Stahlbau 67（1998）]没有导致这种令人满意的结果，分别呈现为12.41％和16.51％的平均偏差。

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