Experimental study and design method of embedded concrete-filled rectangular steel tube column base under cyclic load
Experimental study and design method of embedded concrete-filled rectangular steel tube column base under cyclic load
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DOI：
10.1016/j.engstruct.2023.117384
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发表时间：
2024-03
影响因子：
5.5
通讯作者：
Yan Xu;Lanhui Guo;Shan Gao;Shasha Tan
中科院分区：
文献类型：
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作者：
Yan Xu;Lanhui Guo;Shan Gao;Shasha Tan
预埋式柱脚由于其刚度大、抗震性能好等优点，在钢管混凝土结构中得到了广泛的应用。本文通过对6根埋置矩形钢管混凝土柱脚的试验研究，分析了埋置深度对柱脚承载力的影响，改进措施和轴压比对柱脚抗震性能的影响。试验结果表明，设置加劲肋、增大柱脚埋深或轴压比可以提高柱脚的抗震性能。在本试验中，有加劲肋和无加劲肋柱的临界埋深分别为柱宽B的0.7倍和1.5倍。当埋深为0.7B时，锚栓对柱脚抗弯承载力的贡献最大可达14.2%。在分析埋入式碳纤维柱脚中柱与混凝土基础之间传力机理的基础上，提出了考虑各构件对碳纤维柱脚抗弯承载力贡献的设计方法。预测结果与测试结果和采集数据吻合良好，误差在± 15%以内。基于该设计方法的参数分析揭示了各参数对柱脚抗弯承载力的影响规律。
Embedded column base has been widely used in concrete-filled steel tube (CFST) structures due to its high rigidity and good seismic performance. However, the strength analysis of the embedded CFST column base was not yet clear since there was little experimental research on it. In this paper, the experimental investigations of six embedded concrete-filled rectangular steel tube (CFRST) column bases under constant axial load and cyclic load were carried out to study the effects of embedded depth, improvement measures and axial compression ratios on the seismic performance of the column bases. The experimental results indicated that setting stiffeners, increasing the embedded depth or axial compression ratios could improve the seismic performance of the column base. In this experiment, the critical embedded depths of the columns with or without stiffeners were 0.7 and 1.5 times the column widthBrespectively. When the embedded depth was 0.7B, the contribution of anchor bolts to the moment resistance capacity of the column bases could reach up to 14.2%. Based on the analysis of the force transmission mechanism between the column and the concrete foundation in the embedded CFRST column base, a design method considering the contribution of different components to the moment resistance capacity of the CFRST column bases is proposed. The prediction results are in good agreement with the tested results and collected data, within ± 15% error. The parameter analysis based on the design method has revealed the influence patterns of various parameters on the moment resistance capacity of the column bases.