方钢管自密实混凝土加固钢筋混凝土方柱轴心受压承载力

Bearing Capacity of Square RC Columns Strengthened with Self-compacting Concrete Filled Square Steel Tubes Under Axial Load

采用统一强度理论,对方钢管自密实混凝土加固钢筋混凝土方柱的轴心受压机理和约束模型进行分析,考虑方钢管材料的特点及对混凝土的约束作用,提出了方钢管自密实混凝土加固钢筋混凝土方柱的轴心受压承载力计算公式,将计算公式与文献试验结果进行对比,验证了该理论公式的正确性,并得出统一强度理论参数b、钢管厚度t、参数k等因素对承载力的影响规律。该结果为此类方钢管自密实混凝土加固钢筋混凝土方柱轴心受压承载力的计算提供了一定的理论依据。

Using the unified strength theory, with material characteristic of square steel tube and their confinement to the concrete taken into consideration, the performing characteristics and confine- ment mechanism of the confined columns are studied. Based on the above analysis, the formulae for ulti- mate bearing capacity of square RC columns strengthened with self-compacting concrete filled square steel tubes under axial load are deduced. The comparisons between the calculation results and experiment results are carried out and the results show that the theory formulae are correct and viable. The effects of the parameters are considered in the theoretic analysis. The results offer the theoretical foundation for the research of the square RC columns strengthened with self-compacting concrete filled square steel tubes under axial load.