圆钢管增强高强混凝土柱正截面承载力计算

Calculation of flexural strength for high-strength concrete columns reinforced with circular steel tubes

根据塑性理论下限定理，针对工程中常用的对称配筋形式，推导出圆钢管增强的钢筋高强混凝土柱正截面承载力解析解。在大量计算分析的基础上，提出了当钢管直径与柱截面长边尺寸之比为1／4—2／3、钢筋为HRB335级、全截面纵筋配筋率在1％-3％之间时圆钢管增强钢筋高强混凝土柱正截面承载力的简化计算方法。试验验证和算例计算结果表明，采用该简化方法的计算结果与试验值接近，偏安全，计算过程更加简捷和实用。

Based on the lower limit principle of plastic theory, formulas are derived for calculating the flexural strength of highstrength concrete columns reinforced with steel tubes in the form of symmetrical reinforcement which is commonly used in engineering. Through a great deal of calculation and analysis, a simplified method for calculating the flexural strength of highstrength concrete columns is proposed under the condition that the ratio of tube diameter to the size of long side of column section is in the range of 1/4 - 2/3, the grade of steel is HRB335, and the axial reinforcement ratio is in the range of 1% - 3 %. A case study shows that the calculated result of the simplified method is close to the experimental data, and that the method is simple in calculation and practical in engineering.