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Collapse resistance of steel beam-concrete slab composite substructures subjected to middle column loss

机译:中柱损失下钢梁混凝土平板组合结构的抗倒塌性能

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An energy-based method is proposed to determine the structural responses of composite beam-slab substructures under middle column removal scenarios. A tri-linear resistance-displacement curve is proposed. Three factors contributing to the internal energy dissipation are accounted for, including the extension of reinforcing bars and steel beams, the additional bending moment induced from membrane forces in the slab and tensile forces in beams, and sectional bending moment along yield lines of the slab. Parametric studies are conducted based on validated finite element models to investigate the effect of slab planar aspect ratio, slab thickness, slab reinforcement ratio and beam section height on the behavior of composite beam-slab substructures subjected to middle column loss. The numerical results show that these four parameters have limited effects on the yield displacement of the substructure. The accuracy and effectiveness of the proposed method are verified against numerical results with errors less than 15%. It is found that the first two factors considerably contributed to the collapse resistance of the substructures at large deflections, by accounting for more than 65% of the total energy dissipation capacity. At the collapse limit state, the contribution from the slab is mainly influenced by its reinforcement ratio. The beam height has little effect on the beam contribution to the collapse resistance of the substructure. (C) 2018 Elsevier Ltd. All rights reserved.
机译:提出了一种基于能量的方法来确定中柱拆除场景下组合梁板子结构的结构响应。提出了三线性电阻-位移曲线。解释了造成内部能量耗散的三个因素,包括钢筋和钢梁的延伸,板坯中的膜力和梁中的拉力引起的附加弯矩,以及沿板坯屈服线的截面弯矩。在已验证的有限元模型的基础上进行参数研究,以研究平板平面纵横比,平板厚度,平板增强比和梁截面高度对受中柱损失影响的复合梁平板子结构性能的影响。数值结果表明,这四个参数对子结构屈服位移的影响有限。通过数值结果验证了所提方法的准确性和有效性,误差小于15%。发现前两个因素通过占总能量消散能力的65%以上,极大地促进了子结构在大挠度下的抗倒塌能力。在塌陷极限状态下,板的贡献主要受其配筋率的影响。梁的高度对梁对子结构的抗塌陷性的影响很小。 (C)2018 Elsevier Ltd.保留所有权利。

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