FRP圆管增强不锈钢海水海砂混凝土方柱轴压性能试验研究及承载力计算  

Axial compression performance test and bearing capacity calculation of FRP circular tube reinforced stainless steel seawater and sea concrete square column

作　　者：陈宗平[1,2,3] 赵杨杰 周济 梁延 梁莹 CHEN Zongping;ZHAO Yangjie;ZHOU Ji;LIANG Yan;LIANG Ying(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;School of Architecture and Civil Engineering,Nanning University,Nanning 530200,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China;College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]南宁学院土木与建筑工程学院,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 [4]南京林业大学土木工程学院,江苏南京210037

出　　处：《建筑结构学报》2025年第1期160-172,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);八桂学者专项研究经费项目([2019]79号);广西科技基地和人才专项(AD210750031)。

摘　　要：为研究内圆FRP外方不锈钢双管复合约束海水海砂混凝土柱轴压受力性能,以FRP类型(CFRP、GFRP、BFRP、AFRP)和FRP管厚度为变化参数,完成15个内圆FRP管外方不锈钢双管海水海砂混凝土柱和2个普通方不锈钢管海水海砂混凝土柱的轴心受压试验,观察其受力破坏全过程及破坏形态,获取荷载-位移曲线和应力-应变数据,并对其破坏形态、轴压承载力、能量耗散、延性、损伤演化等受力性能进行分析。研究结果表明:柱破坏模式大多数呈现鼓曲褶皱破坏,内置FRP管有效改善了方不锈钢管对混凝土约束不均匀的缺点;内圆FRP管与外方不锈钢管之间有良好的协同工作能力;内圆FRP外方不锈钢双管复合柱比普通方不锈钢管柱具有更好的轴压承载能力和变形能力,其中内置CFRP管的提高效果最优,其次是AFRP管,二者轴压承载力较普通方不锈钢管柱分别提高24.2%、15.5%;同时,随着FRP管厚度的增加,柱表现出更优良的轴压性能。基于“复合约束叠加法”推导的内圆FRP外方不锈钢双管海水海砂混凝土柱轴压承载力计算与试验值吻合较好,相对误差在10%以内。To investigate the axial compressive behavior of sea sand and seawater concrete columns with inner circular FRP and outer square stainless steel double-tube composite confinement,variations in FRP types(CFRP,GFRP,BFRP,AFRP)and FRP tube thickness were considered as parameters.Fifteen specimens of inner circular FRP and outer square stainless steel double-tube sea sand and seawater concrete columns,as well as two specimens of ordinary square stainless steel tube sea sand and seawater concrete columns,were tested for axial compressive strength.The tests observed the force-deformation process and failure modes,collected load-displacement curves and strain distribution data,and conducted a comprehensive analysis of failure modes,ultimate bearing capacity,energy dissipation,stiffness degradation,and ductility.The results indicate that the majority of specimens exhibit buckling failure model,and the embedded FRP tube effectively improves the uneven constraint characteristics of square stainless steel tubes on concrete.There is good synergy between the inner circular FRP tube and the outer square stainless steel tube.The composite column with inner circular FRP and outer square stainless steel tube has better axial compressive bering capacity and deformability compared to the ordinary square stainless steel tube column.The enhancement is most pronounced with the incorporation of CFRP tube,followed by AFRP tube.Compared with ordinary square stainless steel tube column,the axial compressive bearing capacity of the two is increased by 24.2%and 15.5%,respectively.Additionally,as the thickness of the FRP tube increases,it demonstrates even better axial compressive performance.The calculation formula for the axial compressive bearing capacity of sea sand and seawater concrete columns with embedded FRP circular tube and stainless steel tube,derived based on the“composite confinement superposition method”,exhibits good accuracy and aligns well with experimental values,the error is within 10%.

关 键 词：不锈钢方钢管 海水海砂混凝土 FRP圆管 静力试验 轴压性能 承载力计算 

分 类 号：TU398[建筑科学—结构工程] TU317.1