CFRP-钢复合约束海洋混凝土柱轴压性能试验研究及承载力计算  

Experimental study on axial compression performance and bearing capacity calculation of CFRP-steel confined ocean concrete columns

作　　者：陈宗平[1,2,3] 庞云升 许瑞天 周济 CHEN Zongping;PANG Yunsheng;XU Ruitian;ZHOU Ji(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;College of Architecture and Civil Engineering,Nanning University,Nanning 530200,China;Key Laboratory of Disaster Prevention and Structural Safety of the Ministry of Education,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]南宁学院土木建筑工程学院,广西南宁530200 [3]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《建筑结构学报》2023年第7期116-128,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(51578163);中央引导地方科技发展资金项目(桂科ZY21195010);广西八桂学者专项研究项目([2019]79号);广西科技基地与人才专项(桂科AD21075031)。

摘　　要：为研究CFRP-钢复合约束海洋混凝土柱轴压性能,以CFRP的粘贴位置与粘贴层数为变化参数,设计了18根柱进行轴心受压试验。观察了轴压柱的受力破坏过程及形态,获取了荷载-位移全过程曲线,通过受力全过程的破坏形态、荷载-变形曲线、刚度退化、延性等对CFRP-钢复合约束海洋混凝土柱轴压性能进行分析。基于双剪统一的厚壁圆筒理论提出了该类CFRP-钢复合约束海洋混凝土柱的轴压承载力理论计算式。结果表明:CFRP-钢复合约束海洋混凝土柱的最终破坏形态与CFRP粘贴的位置明显相关,未粘贴内壁CFRP布的轴压柱最终呈腰鼓向剪切破坏过渡状态,而粘贴有内壁CFRP布的轴压柱则呈剪切破坏;轴压柱的承载力与CFRP层数呈正相关,随CFRP层数的增加,轴压柱的承载力平均提高率分别为7.3%、20.7%、33.4%,相同层数下,内壁粘贴CFRP的轴压柱承载力更高;轴压柱初始弹性刚度与CFRP粘贴的层数及位置关联较小,而当不考虑轴压柱腐蚀问题时,在减缓轴压柱刚度退化速率的效果上,内壁粘贴CFRP布的作用优于外壁粘贴CFRP;轴压柱延性随CFRP层数的增加总体呈明显下降趋势,与CFRP粘贴的位置关联较小;所提出轴压承载力计算式的计算结果与试验结果吻合较好,验证了其准确性。In order to study the mechanical properties of ocean concrete columns confined with CFRP and steel under axial compression,18 specimens were designed to carry out axial compression tests with CFRP adhesion position and number of layers as variable parameters.The mechanical failure process and morphology of the axially compressed columns were observed,the load-displacement curve was obtained,and mechanical properties of ocean concrete columns confined with CFRP and steel under axial compression were analyzed by the failure modes,load-deformation curves,stiffness degradation,and ductility.Based on the unified thick-walled cylinder theory of double-shear,the theoretical calculation formula for the axial compression capacity of the CFRP-steel confined ocean concrete columns was proposed.The results show that the final failure mode of CFRP-steel confined ocean concrete column is significantly related to the position of CFRP adhesion.The axial compression columns without CFRP on the inner wall show transition state from waist drum to shear failure,while the axial compression columns with CFRP on the inner wall show shear failure.The axial compression capacity of columns is positively related with the number of CFRP layers.With the increase of CFRP layers,the average increase rates of the axial compression capacity are 7.3%,20.7%,and 33.4%,respectively.Under the same number of layers,the axial compression capacity of the columns with CFRP adhered to the inner wall is higher.The initial elastic stiffness of the axial compression columns is less associated with the number and position of CFRP adhesion.When the corrosion problem is not considered,the effect of inner CFRP is better than outer CFRP in slowing down the stiffness degradation rate of the axial compression columns.The ductility based on energy dissipation shows an overall decreasing trend with the increase of the number of CFRP layers,and is less associated with the position of CFRP adhesion.The calculation results of the proposed formula are in good agreement w

关 键 词：海洋混凝土柱 内外壁CFRP 复合约束 静力试验 轴压性能 承载力计算 

分 类 号：TU398.9[建筑科学—结构工程] TU312.1TU317.1