CFRP筋-珊瑚混凝土柱偏压力学性能数值分析  

Numerical analysis on mechanical properties of eccentrically loaded coral concrete columns reinforced with CFRP bars

作　　者：陈爽 关纪文[2,3] 梁淑嘉 陈红梅 CHEN Shuang;GUAN Jiwen;LIANG Shujia;CHEN Hongmei(College of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,Guangxi,China;College of Civil Engineering and Architecture,Nanning University,Nanning 530200,Guangxi,China;College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,Guangxi,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]南宁学院土木与建筑工程学院,广西南宁530200 [3]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《河南理工大学学报（自然科学版）》2023年第1期175-184,共10页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51568013);广西建筑新能源与节能重点实验室开放基金资助项目(桂科能19-J-21-3);广西高等学校高水平创新团队及卓越学者计划项目(2017);广西高校中青年教师科研基础能力提升项目(2021KY0338)。

摘　　要：为研究CFRP筋增强珊瑚混凝土柱偏心受压力学性能,通过ANSYS软件对30根试验柱进行数值分析,讨论不同偏心距、长高比、纵筋率对试件极限承载力、受压侧混凝土应力、柱中挠度和位移的影响。结果表明:偏心距、长高比的增大使试件的极限承载力减小,柱中挠度增大,其中,试件PY-60受压侧混凝土极限应力仅为23 MPa,约为轴压柱PY-0受压混凝土极限应力的1/2;纵筋率的增大一定程度上可提高试件的承载能力。进行二阶挠曲效应参数分析,提出CFRP筋-珊瑚混凝土偏心受压柱的弯矩放大系数ηns计算方法,并结合现行规范进行适应性修正,其理论计算值与现有研究的试验结果吻合良好,具有一定的参考价值。To study the mechanical properties of eccentric compression coral concrete column with CFRP bars reinforced,the numerical analysis of 30 test columns were carried out by ANSYS. The effects of eccentricity,length to height ratio and longitudinal reinforcement ratio on the ultimate bearing capacity,the stress of concrete on compression side,the mid-span deflection and displacement of specimens were measured and analyzed. The results indicated that the increase of eccentricity and length to height ratio not only decreased the ultimate bearing capacity,but also resulted in critical mid-span deflection. The ultimate stress of concrete on compression side in specimen PY-60 was only 23 MPa,about 1/2 of the ultimate stress of concrete of axial specimen PY-0. Meanwhile,the ultimate bearing capacity was improved by increasing the longitudinal reinforcement ratio of specimens. Subsequently,the second-order flexural effect was analyzed,based on the current code,the calculation method of moment magnification factor ηns on CFRP reinforced coral concrete eccentric compression column was put forward and corrected adaptively in the paper. The theoretical calculation results agreed well with the experimental results of existing studies,which had guiding values to a certain extent.

关 键 词：CFRP筋 珊瑚混凝土柱 偏心受压 弯矩放大系数 

分 类 号：TU377.9[建筑科学—结构工程]