恶劣环境作用下FRP-混凝土界面断裂能的概率分布

摘要

The fracture energy of FRP-concrete interface under the environments of dry-wet cycling in high temperature,freeze-thaw cycling,seawater immersion,wet-thermal and hot water was calculated according to the corresponding experimental data. Then the probability distributions of the interfacial fracture energy in harsh environments were learned by S-W test,K-S test,C-M test, A-Dtest and χ2 test respectively. It is shown that the interfacial fracture energy in a certain harsh environment may subject to several probability distributions. The optimum distributions of the interfacial fracture energy under the environments of dry-wet cycling in high temperature,seawater immersion,wet-thermal and hot water are all对数正态distributions and that under the environment of freeze-thaw cycling is正态distribution,which can provide the foundation for the reliability analysis of the FRP-concrete interface. The proba-bility distributions of interfacial fracture energy in different harsh environments can′t be assumed with the same distribution in structuresˊdesign because they are much different. All the factors should be considered into selecting tests,or the judging results of probability dis-tribution of interfacial fracture energy may be influenced.%根据高温干湿循环、冻融循环、海水浸泡、湿热及热水5种环境作用下FRP-混凝土界面的试验数据，计算了相应的FRP-混凝土界面断裂能，并采用S-W检验、K-S检验、C-M检验、A-D检验及χ2检验分析了各恶劣环境作用下界面断裂能的概率分布。结果表明：同一种恶劣环境作用下的界面断裂能可能服从多种概率分布；高温干湿交替、海水浸泡、湿热环境及热水作用下FRP-混凝土界面断裂能的最优分布均为对数正态分布，冻融循环作用下FRP-混凝土界面断裂能的最优分布为正态分布，它们可作为FRP-混凝土界面耐久性的可靠性分析依据；结构设计时，不能将不同环境作用下界面断裂能的概率分布假设为同一种，因为它们具有较大的区别；选用检验方法时需要综合考虑各个因素，否则可能会影响概率分布的判别结果。