对称配筋偏心受压钢筋混凝土柱N_(u)-M_(u)曲线特性及数值分析  

The characteristics of N_(u)-M_(u)curve and numerical analysis of eccentrically loaded RC columns with symmetric reinforcement

作　　者：周清 国伟 齐麟[2] ZHOU Qing;GUO Wei;QI Lin(Binzhou Planning&Design Research Institute Co.,Ltd.,Binzhou 256600,China;College of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]滨州市规划设计研究院有限公司,山东滨州256600 [2]中国民航大学交通科学与工程学院,天津300300

出　　处：《山东交通学院学报》2024年第3期91-98,103,共9页Journal of Shandong Jiaotong University

基　　金：国家重点研发计划项目(2021YFB2600504);山东省住房城乡建设科技计划项目(2021-R3-010,2021-K5-028)。

摘　　要：为分析截面面积、配筋率、钢筋强度、混凝土强度等参数对对称配筋偏心受压钢筋混凝土(reinforced concrete, RC)柱的极限弯矩Mu与极限轴力Nu(N_(u)-M_(u))曲线的影响,推导对称配筋偏心受压RC柱的Mu与Nu的函数关系式并绘制N_(u)-M_(u)曲线。采用软件ANSYS对RC柱进行数值分析,分析柱底截面的最大极限弯矩与最大极限轴力数值分析结果与理论计算结果的相对差。研究表明:极限轴力随截面面积、配筋率、钢筋强度、混凝土强度的增大而增大,截面面积对其影响最大,混凝土强度、配筋率对其影响较小,钢筋强度对其影响最小;最大极限轴力、最大极限弯矩的理论计算结果均大于数值分析结果;最大极限弯矩的理论计算结果与数值分析结果的相对差大于最大极限轴力,前者约为10%,后者约为5%。To analyze the influence of parameters such as cross-sectional area,reinforcement ratio,steel bar strength,and concrete strength etc.,the relationship between the ultimate bending moment M u and the ultimate axial force N u(N_(u)-M_(u))curve of eccentrically loaded reinforced concrete(RC)columns with symmetrical reinforcement,the functional relationship between M u and N u for symmetrically reinforced eccentrically loaded RC columns is derived and the N_(u)-M_(u)curve is plotted.Software ANSYS for numerical analysis of RC columns is used to analyze the errors between the numerical analysis results of the maximum ultimate bending moment and the maximum ultimate axial force of the column base section and the theoretical calculation results.The study finds that the ultimate axial force increases with the increase of cross-sectional area,reinforcement ratio,rebar strength,and concrete strength,with the cross-sectional area having the greatest influence,concrete strength and reinforcement ratio having a smaller influence,and steel bar strength having the smallest influence;the theoretical calculation results of the maximum ultimate axial force and maximum ultimate bending moment are both greater than the numerical analysis results;the error between the theoretical calculation results and the numerical analysis results of the maximum ultimate bending moment is bigger than that of maximum axial force,the former is approximately 10%,while the latter is approximately 5%.

关 键 词：偏心受压RC柱 对称配筋 N_(u)-M_(u)曲线 参数分析 数值分析 

分 类 号：U448.35[建筑科学—桥梁与隧道工程] U663.93[交通运输工程—道路与铁道工程] TU312