钢筋高强混凝土框架柱轴压比限值的确定方法

Determination of limit value of axial compression ratio of reinforced high-strength concrete columns

为保证钢筋高强混凝土框架柱满足延性需求,采用偏心受压构件界限破坏理论,根据截面力的平衡和变形协调关系,推导出普通配筋截面柱的轴压比限值计算公式。在此基础上,分析混凝土强度、钢筋强度、配箍率、配筋率、密集纵筋芯柱等因素对轴压比限值的影响,提出能反映上述变化参数作用时的钢筋高强混凝土柱轴压比限值计算方法。研究成果为钢筋高强混凝土柱设计提供了理论依据。

To ensure that reinforced high-strength concrete frame columns meet ductility requirement,a system study is necessary to be carried out on the limit value of axial compression ratio of reinforced high-strength concrete frame columns. Based on the limit failure theory for eccentric compression,calculation formula for the limit value of axial compression ratio was derived by using force equilibrium and deformation coordination. On this basis,the influence of concrete strength,reinforcement strength,stirrup ratio,reinforcement ratio and core column with dense longitudinal reinforcement on the limit value of axial compression ratio was analyzed,and the calculation methods for the limit value of axial compression ratio of reinforced high-strength concrete columns were proposed. Research results can provide a theoretical basis for the design of reinforced high-strength concrete columns.