【摘要】 为验证采用FRP加固混凝土结构的耐久性能,采用快速冻融循环试验方法,首先研究了冻融循环对FRP力学性能、粘结剂剪切粘结性能、FRP与混凝土粘结强度的影响,并在此基础上进一步研究了冻融循环对FRP加固混凝土柱受力性能的影响.结果表明:冻融循环对CFRP的力学性能影响不大,对GFRP力学性能有较大影响;冻融循环对FRP与混凝土粘结性能影响较大,对FRP增强混凝土柱的影响不显著.更多还原

【Abstract】 External bonding fiber reinforced polymer(FRP) has been increasingly used to repair the concrete structures.Tests are necessary for verifying the durability of the strengthened structures due to the short time application in repairing concrete structures.So the fast freeze-thaw test is adopted,and mechanical behavior of FRP,adhesive behavior and bond behavior between FRP and concrete after the freeze-thaw cycle are analyzed.In addition,the effects of the freeze-thaw cycle on the concrete columns strengthened with FRP are studied.CFRP specimens subjected to freezethaw cycle show good durability with no significant degradation in tensile strength and modulus.However,GFRP specimens exhibit a little bit decrease in mechanical property after freeze-thaw cycle.The bond strength between FRP and concrete has obvious decrease after freeze-thaw cycle.更多还原