Experimental investigation on seismic performance of an enhanced embedded base for CFST columns
Experimental investigation on seismic performance of an enhanced embedded base for CFST columns
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DOI：
10.1016/j.engstruct.2023.117154
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发表时间：
2024-02
影响因子：
5.5
通讯作者：
Shasha Tan;Lanhui Guo;Chen Jia;Yan Xu
中科院分区：
文献类型：
--
作者：
Shasha Tan;Lanhui Guo;Chen Jia;Yan Xu
为了减小钢管混凝土柱脚的埋置深度，提高柱脚的抗震性能，提出了一种加强型埋置柱脚。柱脚采用一对加强钢梁和锚栓加固。对4个预埋式柱脚进行了轴压荷载和反复水平荷载作用下的试验，试验参数包括柱脚类型、加强梁高度和轴压比。根据试验结果分析了滞回曲线、骨架曲线、刚度退化、耗能能力和应变发展。试验结果表明，与传统的预埋式柱脚相比，增强型预埋式柱脚具有较高的强度和耗能能力。埋入深度比为0.7时，加强型埋入式柱脚可达到钢管混凝土柱的极限承载力。最后，提出了加强型埋入式柱脚的极限承载力计算方法。该方法考虑了钢管与混凝土的相互作用、加固钢梁与混凝土的相互作用以及锚栓的变形所产生的抗力。
To reduce the embedded depth and improve the seismic performance of the embedded column base for concrete-filled steel tubes, an enhanced embedded column base is proposed. The column base is strengthened by a pair of strengthening steel beams and anchor bolts. Four embedded column bases were tested under axial compression load and cyclic lateral load, and the test parameters included the type of column base, height of strengthening beam, and axial load ratio. The hysteresis curves, skeleton curves, stiffness degradations, energy dissipation capacities, and strain developments were analyzed based on the test results. The test results indicated that the enhanced embedded column base exhibited high strength and a high energy dissipation capacity compared with the traditional embedded column base. An embedded depth ratio of 0.7 enabled the enhanced embedded column base to achieve the ultimate strength of the CFST column. Finally, a calculation method for the ultimate strength of the enhanced embedded column base was proposed. This method considers the resistance resulting from the interaction between the steel tube and concrete, the interaction between the strengthening steel beam and concrete, and the deformation of anchor bolts.