海洋环境GFRP筋海水海砂混凝土梁受力性能试验及承载力计算  

Test on Mechanical Properties and Bearing Capacity Calculation of GFRP Bars Reinforced Seawater Sea-sand Concrete Beams Exposed to Marine Environment

作　　者：陈宗平[1,2] 黎盛欣 周济 戴上秦 CHEN Zongping;LI Shengxin;ZHOU Ji;DAI Shangqin(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of 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,南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,南宁530004

出　　处：《材料导报》2023年第20期109-118,共10页Materials Reports

基　　金：国家自然科学基金(51578163);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);中央引导地方科技发展资金项目(桂科ZY21195010);广西重点研发计划项目(桂科AB21220012);广西研究生教育创新计划资助项目(YCBZ2021020)。

摘　　要：为研究海洋环境玻璃纤维增强聚合物筋(Glass fiber reinforced polymer bars,GFRP筋)海水海砂混凝土梁的受力性能,以暴露环境、暴露龄期和海砂取代率为变化参数,设计七个试件进行单调静力加载试验,观察了其受力破坏过程及形态,获取了试件的荷载-挠度曲线,分析了各变化参数对此类构件极限承载力、初始刚度和延性系数的影响规律。结果表明:与常规大气环境相比,经盐雾环境暴露后试件极限承载力增大了28.0%,而经潮汐环境暴露后极限承载力降低了13.0%;270 d龄期内,随着潮汐暴露龄期的延长,试件的极限承载力先增大后减小,而初始刚度和延性系数均呈减小趋势;海砂取代率的增大不利于试件的极限承载力和初始刚度。最后,探讨了海洋环境暴露后GFRP筋海水海砂混凝土梁受弯承载力的计算方法。To investigate the mechanical properties ofGlass Fiber Reinforced Polymer bars(GFRP bars)reinforced seawater sea-sand concrete beams exposed to marine environment,seven beams were designed for static loading tests using exposure environment,exposure duration,and sea-sand replacement ratio as various parameters.The failure process and failure mode of the specimens were observed,the load versus deflection curves were obtained.Then,the effects of various parameters on the ultimate bearing capacity,initial stiffness,and ductility coefficient of these beams were analyzed.The results show that,compared with the general atmospheric environment,the ultimate bearing capacity of specimen is improved by 28.0%after being exposed to salt-spray environment,while decreased by 13.0%after being exposed to tidal environment.During a 270 day exposure duration,with the increase of the exposure duration of tidal environment,the ultimate bearing capacity increases first and then decreases,while the initial stiffness and ductility coefficient of specimens both tend to decrease.The increase of sea sand replacement ratio is detrimental to specimens’ultimate bearing capacity and initial stiffness.Finally,the calculation method of the flexural capacity of GFRP bars reinforced seawater sea-sand concrete beams exposed to marine environment is discussed.

关 键 词：海洋环境 GFRP筋 海水海砂混凝土梁 受力性能 承载力计算 

分 类 号：TU528[建筑科学—建筑技术科学]