GFRP-珊瑚礁混凝土柱偏心受压承载性能及弯曲延性分析  

Analysis on Bearing Capacity and Bending Ductility of GFRP-Coral Concrete Columns under Eccentric Compression

作　　者：关纪文 陈华 常萍[1] 梁庆文 但宇 杨汉宁 陈红梅 GUAN Jiwen;CHEN Hua;CHANG Ping;LIANG Qingwen;DAN Yu;YANG Hanning;CHEN Hongmei(College of Architecture and Civil Engineering,Nanning University,Nanning 530200,China;College of Civil and Surveying-Mapping Engineering,Guilin University of Technology at Nanning,Chongzuo 532100,China)

机构地区：[1]南宁学院土木与建筑工程学院,南宁530200 [2]桂林理工大学南宁分校土木与测绘工程系,崇左532100

出　　处：《硅酸盐通报》2023年第7期2409-2418,共10页Bulletin of the Chinese Ceramic Society

基　　金：广西高校中青年教师科研基础能力提升项目(2020KY64018,2023KY1857);南宁学院科研项目(2022XJ04,2022XJ05,2022XJ06)。

摘　　要：为研究偏心距、配箍率对玻璃纤维复合材料(GFRP)筋珊瑚礁混凝土柱偏心受压承载性能和弯曲延性的影响,对5根珊瑚礁混凝土柱进行偏心受压试验,研究偏心距对试件承载性能、GFRP纵筋应变、混凝土应变、竖向位移及柱中挠度的影响。基于上述5组偏心距,采用ANSYS软件建立15根珊瑚礁混凝土柱模型,即每组偏心距下分别设计0.375%(箍筋间距分别为100、75、50 mm,下同)、0.500%、0.750%三种配箍率构件。最后,提出构件弯曲延性、截面曲率的计算方法。结果表明:随着偏心距增加,构件的承载力减小,受压侧GFRP纵筋应变增长速度减小;配箍率的增加不仅提高了试件承载力,同时减小了柱中挠度。构件承载力及弯曲延性的理论计算值同ANSYS软件模拟结果吻合良好。To study the effects of eccentricity and stirrup ratios on bearing capacity and bending ductility of glass fiber composite(GFRP)bars-coral concrete columns under eccentric compression,an eccentric compression test was carried out on 5 coral concrete columns.The effect of eccentricity on bearing capacity,GFRP longitudinal bar strain,concrete strain,vertical displacement and mid-span deflection was investigated and analyzed.Based on the five eccentricities above,15 coral concrete columns were established and studied by ANSYS.Three stirrup ratios of 0.375%(stirrup spacing of 100,75 and 50 mm respectively,the same as below),0.500%and 0.750%were set in each group of eccentricity.Subsequently,the calculation methods of bending ductility and sectional curvature of these specimens were put forward in this paper.The results show that the increase of eccentricty not only decreases the bearing capacity,but reduces the increment speed of GFRP longitudinal bars strain on compression side.The increase of stirrup ratios not only improves the bearing capacity but also reduces the mid-span deflection of specimens.The theoretical calculated values of bearing capacity and bending ductility are in good agreement with the ANSYS simulated results.

关 键 词：GFRP筋 珊瑚礁混凝土 偏心受压 配箍率 承载性能 弯曲延性 截面曲率 

分 类 号：TU377.9[建筑科学—结构工程]