Experimental investigation on punching shear behavior of the embedded column base for CFSTs
Experimental investigation on punching shear behavior of the embedded column base for CFSTs
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DOI：
10.1016/j.engstruct.2022.114371
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发表时间：
2022-07
影响因子：
5.5
通讯作者：
S. Tan;Chen Jia;Lanhui Guo;Fusheng Ou;Yan Xu
中科院分区：
文献类型：
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作者：
S. Tan;Chen Jia;Lanhui Guo;Fusheng Ou;Yan Xu
本文对埋入式钢管混凝土柱脚的冲剪性能进行了试验研究。首先进行了钢管与基础混凝土的抗拔试验，得到了钢管与基础混凝土之间的粘结强度。然后对10个试件进行了冲切试验，以揭示埋设剪力钉的柱脚的工作机理。试验结果表明，剪力钉改变了荷载路径，增大了基础的冲切截面，提高了柱脚的冲切抗剪性能。研究还发现，剪力钉直径和间距对冲切抗剪性能有显著影响。最后，提出了一种确定埋入式钢管混凝土柱脚抗冲切能力的方法，将体系中不同构件的贡献相加，包括冲切截面以上栓钉的粘结力和抗剪能力，以及基础的抗力。预测结果与实验结果吻合较好，误差不大于110%±15%。
In this paper, the punching shear behavior of the embedded column base for the concrete-filled steel tube is experimentally studied. Push-out tests were firstly conducted to obtain the bond strength between the steel tube and the foundation concrete. Punching tests were then performed on ten specimens to reveal the working mechanism of the embedded column base with shear studs. The test results indicated that shear studs changed the load path, enlarging the punching section of the foundation and improving the punching shear resistance of the column base. It was also found that the diameter of the shear studs and the distance between the shear studs could affect the punching shear resistance significantly. Finally, a method was proposed to determine the punching shear resistance of the embedded column base for the concrete-filled steel tube, by adding up the contributions from the different components of the system, including the bond force and shear resistance of studs above the punching section, and the resistance of foundation. The predicted results showed good agreement with the experimental results, with errors not greater than ± 15%.