干湿交替条件下FRP布加固混凝土粘结性能  

Bond tests of concrete strengthened with FRP sheet under dry-wet cycle condition

作　　者：张延年[1] 常萍[1] 顾亚洁 郑怡 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]南宁学院土木与建筑工程学院,广西南宁530200

出　　处：《辽宁工程技术大学学报（自然科学版）》2015年第7期842-846,共5页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金项目(51078065);质检公益性行业科研专项项目(201210040)

摘　　要：为揭示FRP布在干湿循环条件下加固混凝土的粘结性能,采用理论分析和实验的方法,推导了FRP布在干湿循环条件下加固混凝土的粘结性能的衰减函数,揭示出其粘结性能的衰减特征;分析其外观、极限承载力及粘结强度等指标,研究FRP布在干湿循环条件下加固混凝土的粘结性能衰减过程.研究结果表明:混凝土试件从混凝土浅层的拉断破坏或者从纤维布处破坏,混凝土等级高的试块是混凝土被拉断.相同混凝土等级情况下,干湿交替早期对粘结强度的影响较大,后期影响不明显,干湿交替对较低等级混凝土影响较大,对较高等级混凝土影响较低;CFRP的正拉粘结强度大于GFRP的粘结强度.In order to reveal bond tests of concrete strengthened with FRP sheet under dry-wet cycle condition, this paper utilized the method of theory analysis and experiment, and deduced the die-away curve under dry-wet cycle condition with FRP. The dimensions, ultimate tensile strength and adhesive strength are analyzed comparatively. The experimental results show that the longer day the specimen are dealt in dry-wet cycle condition, the more tensile failure of concrete from superficial or Fiber Reinforce Plastic. It is not easy to be pulled if the level of concrete is higher. The bond strength has a great influence under dry-wet when start in the same concrete grades and different duration, but it is not obvious to change later. Dry-wet cycle has a significant impact on adhesive property of low strength concrete and FRP. The adhesive property of CFRP is higher than that of GFRP.

关 键 词：混凝土 耐久性 干湿交替 粘结性能 极限承载力 衰减曲线 

分 类 号：TU375[建筑科学—结构工程]