圆钢管增强高强混凝土柱正截面承载力计算

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。

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

Based on the lower limit principle of plastic theory,formulas are derived for calculating the flexural strength of high-strength 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 high-strength 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.