对称配筋钢筋混凝土小偏心受压柱正截面承载力分析

Analysis of Normal Section Strength for Symmetrically Reinforced Concrete Rectangular Column with Small Eccentricity

基于平截面假定推导了钢筋混凝土小偏心受压柱离轴力远侧纵向钢筋应力的计算公式,建立对称配筋钢筋混凝土小偏心受压矩形截面柱的正截面承载力计算表达式。采用所建立的表达式与《混凝土结构设计规范》中的计算公式分别分析了矩形截面小偏心受压柱截面配筋和正截面承载力。结果表明,采用《混凝土结构设计规范》中的公式计算得到的纵向钢筋截面面积小于基于平截面假定建立的正截面承载力计算表达式算出的纵向钢筋截面面积,其最大误差可达11.1%;而受压承载力的计算值相近。

Based on the hypothesis that the cross-sectional strains remained plane,a formula for stress of steel bars far from the axial force was presented,and the equations for symmetrically reinforced concrete rectangular with small eccentricity were founded to calculate flexural and axial capacity.Using the equations and the formula presented by the code,the areas of longitudinal reinforcements and the flexural and axial capacities were analyzed.The results demonstrated that the areas of longitudinal reinforcements calculated by the formula given by the Code were less than the areas calculated by the equation based on the plane cross-section hypothesis.The maximum error could reach to 11.1%,while the flexural and axial capacities were close.