长期腐蚀环境影响下GFRP-钢混合配筋混凝土构件的抗弯性能研究  

Research on the flexural behavior of concrete composites with hybrid reinforcement of GFRP bars and steel bars under long term corrosion environment

作　　者：李星[1] 杨子江[1] 孙理想[1] 蔺鹏臻[1] LI Xing;YANG Zijiang;SUN Lixiang;LIN Pengzhen(College of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《铁道科学与工程学报》2017年第12期2605-2612,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51368031);中国铁路总公司科技研究开发计划资助项目(2017G010-C);甘肃省基础研究创新群体资助项目(1506RJIA029)

摘　　要：为了研究长期腐蚀环境影响下GFRP-钢混合配筋混凝土构件的抗弯性能,分别研究水分、温度以及酸碱环境等多种因素长期作用下,GFRP筋与钢筋抗拉强度、有效受拉面积以及同混凝土黏结性能方面的变化。基于构件腐蚀后老化GFRP筋、锈蚀钢筋同混凝土协同工作关系发生的变化,通过构造新的几何条件,推导腐蚀GFRP-钢混合配筋混凝土构件正截面抗弯承载力的计算公式,利用推导的公式分析不同GFRP筋老化率及钢筋锈蚀率对构件抗弯承载力的影响。研究结果表明:GFRP-钢混合配筋混凝土构件在腐蚀环境长期作用下,GFRP筋与钢筋在抗拉强度、有效受拉面积以及黏结性能方面都有不同程度的降低;随着GFRP筋材料老化率、钢筋锈蚀率的不断增加,构件抗弯承载力损失率也不断增加,当GFRP筋老化率达到27%时,钢筋锈蚀率达到35%,构件抗弯承载力也相应损失21.46%。In order to study the flexural behavior of concrete composites with hybrid reinforcement of GFRP bars and steel bars under long term corrosion environment,the effects of moisture,temperature and acid or alkali environment on the tensile strength,effective tensile area and bond strength of GFRP bar and steel bar were analyzed separately.Based on the change in working relationship between the aging GFRP bar and corroded steel bar with concrete,the calculation formula of flexural capacity of reinforced concrete members with corroded GFRP and steel bars is derived by constructing new geometrical condition.The derived formula was then used to analyse the effects of aging rate of GFRP bars and corrosion rate of steel bars on the bearing capacity of the component.The researches show that under the long-term effect of corrosion environment,GFRP bars and steel bars of GFRP-steel reinforced concrete components have different degrees of reduction in terms of tensile strength,effective tensile area and bond properties.With the increase of aging rate of GFRP bars and steel bars,the loss rate of flexural capacity of the component is also increase.When the aging rate of the GFRP bars is27%and corrosion rate of the steel bars is35%,the flexural capacity of the component is also lost21.46%.

关 键 词：GFRP筋 混合配筋 腐蚀环境 混凝土构件 抗弯承载力 

分 类 号：TU375.4[建筑科学—结构工程]