钢筋混凝土偏心受压构件二阶效应计算对比分析

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发布时间：2021-12-06

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根据钢筋混凝土偏心受压构件的受力状态，推导出了构件截面受压承载力计算时相关参数的
计算公式，由此得出了不同配筋率与不同钢筋和混凝土强度比时中国规范 GB 50010--2002、美国
规范 ACI 318一O8和欧洲规范 EN 1992—1—1：2004的构件截面弯矩一轴力曲线；在此基础上，根据中国
混凝土规范中的偏心距增大系数法、美国混凝土规范的弯矩增大系数法和欧洲混凝土规范的基于
名义刚度及名义曲率的方法分析考虑二阶效应的承载力，给出了不同长细比时偏心受压构件的弯
矩一轴力曲线。分析结果表明：对于混凝土偏心受压构件的二阶效应，中国混凝土规范主要考虑了
构件长细比的影响，美国规范考虑了构件端部弯矩、刚度和长细比的影响，欧洲规范考虑了构件长
细比、曲率和端部弯矩的影响；对于构件两端偏心距相同的情况，按中国、美国和欧洲混凝土规范计
算的承载力均随长细比的增大而降低，美国规范下降最快，欧洲规范次之，中国规范下降最慢。
关键词：结构工程；钢筋混凝土构件；二阶效应；弯矩；轴力；承载力
中图分类号：TU375．1 文献标志码：A
Com parative Analysis of Second—order Effect on Eccentrically
Com pressed Reinforced Concrete M em ber
XU Jing。GoNG Jin—xin
(Faculty of Infrastructure Engineering，Dalian University of Technology，Dalian 116024，Liaoning，China)
Abstract：The calculation form ulas used for ultim ate force state design of eccentrically compressed
reinforced concrete members were derived．The sectionalinteractive relations of moment and axial
force of m em bers with different reinforcement ratios of steel bars and strength ratios of steel to
concrete were calculated according tO Chinese Code GB 50010-- 2002，American Code ACI 318—08
and European Code EN 1 992—1—1：2004． Based on it，the corresponding interaction diagrams of
m oment and axial force of members with different slenderness ratios were obtained， taking
second—order effects into account in different methods in the three codes， i． e．， increased
eccentricity m ethod in Chinese Code，m oment m agnifier coefficient method in American Code，as
well as methods based on nomina1 stiffness and nominal curvature in European Code． Analysis
results show that different aspects are considered to analyze the second—order effects of
eccentrically compressed reinforced concrete members in the three codes． End m oments，stiffness
and slenderness ratios of m em ber are considered in Am erican Code， and slenderness ratios．
curvature，as well as end mom ents are considered in European Code． The bearing capacities of