Thin-Walled Structures ( IF 6.4 ) Pub Date : 2021-07-28 , DOI: 10.1016/j.tws.2021.108193 Alexandre Rossi 1 , Alex Sander Clemente de Souza 1 , Renato Silva Nicoletti 1 , Carlos Humberto Martins 2
The behavior of Steel–concrete Composite Beams (SCCB) under the action of hogging moment is not yet fully understood. In this condition, these structural elements may be subjected to local buckling or Lateral Distortional Buckling (LDB). LDB is a mode of stability in which the web must distort in order for the compression flange to displace and twist during buckling. The classic LDB standard procedures start from the determination of the elastic critical moment and subsequently use empirical curves to determine the LDB strength. However, investigations show that there is no consensus in determining the LDB elastic critical moment. In addition, studies indicate that the use of the same empirical curves obtained for the analysis of steel I-beams leads to the conservative results of the LDB strength in SCCB. In this context, this paper investigates the behavior of SCCB under the action of hogging moment through the development of buckling and post-buckling numerical analyses with the ABAQUS software. In the parametric study, the effects of the I-section, the unrestrained length, the reinforcing ratio, the concrete slab height and the slab topology were investigated. The investigations showed divergences between the elastic critical moment and ultimate moment when compared with classic procedures. In addition, the influence of the analyzed parameters is presented. These results can provide a reference for future research and specification reviews.
中文翻译:
受弯矩作用下钢-混凝土组合梁的稳定性行为
钢-混凝土组合梁(SCCB)在承载力矩作用下的行为尚不完全清楚。在这种情况下,这些结构元件可能会受到局部屈曲或横向扭曲屈曲 (LDB)。LDB 是一种稳定模式,其中腹板必须扭曲,以便压缩翼缘在屈曲过程中发生位移和扭曲。经典的 LDB 标准程序从确定弹性临界矩开始,随后使用经验曲线来确定 LDB 强度。然而,调查表明,在确定LDB弹性临界矩方面还没有达成共识。此外,研究表明,使用相同的经验曲线分析钢工字梁会导致 SCCB 中 LDB 强度的保守结果。在这种情况下,本文通过使用 ABAQUS 软件进行屈曲和屈曲后数值分析,研究了 SCCB 在过弯力矩作用下的行为。在参数化研究中,研究了 I 型截面、无约束长度、配筋率、混凝土板高度和板拓扑结构的影响。研究表明,与经典程序相比,弹性临界力矩和极限力矩之间存在差异。此外,还介绍了分析参数的影响。这些结果可以为未来的研究和规范审查提供参考。研究了无约束长度、配筋率、混凝土板高度和板拓扑结构。研究表明,与经典程序相比,弹性临界力矩和极限力矩之间存在差异。此外,还介绍了分析参数的影响。这些结果可以为未来的研究和规范审查提供参考。研究了无约束长度、配筋率、混凝土板高度和板拓扑结构。研究表明,与经典程序相比,弹性临界力矩和极限力矩之间存在差异。此外,还介绍了分析参数的影响。这些结果可以为未来的研究和规范审查提供参考。