负载下外包钢筋混凝土加固轴心受压钢柱受力性能研究

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。

RESEARCH ON MECHANICAL PROPERTIES OF AXIALLY LOADED STEEL COLUMNS REINFORCED BY OUTSOURCING REINFORCED CONCRETE WHILE UNDER LOAD

The mechanical properties and methods for calculating the bearing capacity of axially loaded steel columns reinforced by encasing them in reinforced concrete while already under load were researched through the integration of an experimental study, finite element simulation, and theoretical analysis in this paper. Through experimental study and finite element simulation analysis, the mechanical performance of axially loaded steel structure members reinforced by encasing in reinforced concrete while under load was studied. The influence of the initial loads, concrete strength, and steel strength on the ultimate bearing capacity of reinforced members was researched. The results showed that the bearing capacity and the rigidity of the steel members could be significantly improved using this method of reinforcement. The ultimate bearing capacity of reinforced members decreased with the increase of the initial loads, and increased with the increase of the steel strength. The concrete strength was the most important factor that affected the ultimate bearing capacity of reinforced members. The ultimate bearing capacity of reinforced members increased significantly with the increase of the concrete strength. From analysis of the experimental data and the finite element analysis results, the quantitative results of the influences of concrete strength on the ultimate bearing capacity of reinforced members were obtained. Meanwhile, based on the analysis of the stress and strain state of the various parts of the reinforced members at the time of reinforcement and the time of failure, the bearing capacity calculation formulas were derived for axially loaded steel columns reinforced by outsourcing reinforced concrete while under load, and the results thereof are in good agreement with the test results.