Performance of recycled aggregate concrete-filled steel tubular columns under combined compression and shear load
Performance of recycled aggregate concrete-filled steel tubular columns under combined compression and shear load
复制标题
DOI：
10.1016/j.engstruct.2021.113771
复制
发表时间：
2022-02
影响因子：
5.5
通讯作者：
Zhi Yang;Lin-Hai Han;C. Hou
中科院分区：
文献类型：
--
作者：
Zhi Yang;Lin-Hai Han;C. Hou
本文研究了钢管再生混凝土柱在压剪联合作用下的受力性能。对30个钢管再生骨料混凝土试件进行了试验，研究了试件的破坏形态和受剪承载力。考虑的主要参数包括截面类型，轴压比，剪跨比，含钢率和再生粗骨料的替代率。建立了有限元分析模型，对模型进行了验证，并从破坏形态、荷载-挠度全过程关系、应力分布和荷载传递机理等方面对模型的抗剪性能进行了分析。结果表明，轴压比和剪跨比对破坏形态均有影响。提出了一个拉压杆机构模型来揭示这些影响。四种破坏模式被确定，而再生骨料钢管混凝土柱往往失败的剪切方式与较小的剪跨比，高的轴向荷载水平。最后，对现有的简化模型进行了评估，以预测钢管再生骨料混凝土柱在压剪荷载联合作用下的抗剪承载力。
This paper presents the behavior of recycled aggregate concrete-filled steel tubular columns under combined compression and shear load. A total of 30 recycled aggregate concrete-filled steel tubular specimens were tested, with their failure modes and shear capacities investigated. The main parameters considered include the cross-section type, the axial load ratio, the shear span-to-depth ratio, the steel ratio and the replacement rate of recycled coarse aggregates. A finite element analysis model is established, which is verified and then used to conduct analysis on the shear performance in terms of the failure modes, the full-range load-deflection relations, the stress distributions and the load transfer mechanism. The results show that both the axial load ratio and the shear span-to-depth ratio have influence on the failure modes. A strut-tie mechanism model is proposed to reveal these influences. Four failure modes are identified, while recycled aggregate concrete-filled steel tubular columns tend to fail in a shear manner with a smaller shear span-to-depth ratio and a higher axial load level. Finally, an existing simplified model is assessed to predict the shear capacity of recycled aggregate concrete-filled steel tubular columns under combined compression and shear load.