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该文以试验研究、有限元模拟以及理论分析相结合的方法研究了负载下外包钢筋混凝土加固轴心受压钢柱的受力性能以及承载力计算方法。通过试验与有限元模拟分析,研究了轴心受压钢结构构件负载下外包钢筋混凝土加固后的性能,以及初始负载大小、混凝土强度和型钢强度对加固试件极限承载力的影响。研究表明,外包钢筋混凝土可以显著提高原钢构件的承载能力和刚度;加固后试件的极限承载力随着初始负载的增大而降低;随着型钢强度的提高而增大;混凝土强度是影响加固后试件极限承载力的最主要因素,加固后试件的极限承载力随着混凝土强度的提高而明显增大。根据分析试验数据和有限元分析结果,得到了混凝土强度对加固后试件极限承载力影响的量化结果。同时,通过分析加固时和破坏时构件各部分的应力应变状态,推导出负载下外包钢筋混凝土加固轴心受压钢柱的承载力计算公式,其计算结果与试验结果吻合良好。
In this paper, by means of the combination of experimental research, finite element simulation and theoretical analysis, the mechanical behavior and the bearing capacity calculation method of axially loaded steel columns strengthened by externally loaded RC beams are studied. Through the experiment and the finite element simulation analysis, the performance of the reinforced concrete under axial load under the load of steel structure component and the influence of the initial load, the strength of concrete and the strength of the steel on the ultimate bearing capacity of the strengthened specimens were studied. The results show that the outsourcing of reinforced concrete can significantly improve the bearing capacity and stiffness of the original steel members; the ultimate bearing capacity of the strengthened specimens decreases with the increase of the initial load; the strength increases with the strength of the steel; the strength of the concrete is affected After the reinforcement of the ultimate bearing capacity of the most important factor, the ultimate bearing capacity of reinforced concrete specimens with the increase of strength and significantly increased. According to the analysis of experimental data and finite element analysis results, the quantitative results of the influence of concrete strength on the ultimate bearing capacity of the strengthened specimens are obtained. At the same time, by analyzing the stress and strain state of each component during reinforcement and failure, the formula for calculating the bearing capacity of axially compressed steel columns strengthened with steel-encased concrete under load is derived. The calculated results are in good agreement with the experimental results.