钢筋与结构型合成纤维对混凝土抗冲击性能混杂效应的分析

摘要

In order to investigate the hybrid effect of steel rebar and macro polypropylene fiber on the impact resistance of concrete,a series of drop-weight tests were carried out on different kinds of reinforced concrete specimens. The effects of steel rebar and macro polypropylene fiber on the concrete impact performance was analyzed,and the theory of Weibull distribution was adopted to analyse the number of blows till the first visible crack as well as till the failure of the specimen.The results indicate that macro polypropylene fiber can improve the impact resistance capacity and the combination of steel rebar and macro polypropylene fiber has a positive hybrid effect on impact behaviors.The goodness-of-fit tests indicate that the theory of Weibull distribution has a good fitness to describe the impact resistance of concrete.%为了研究钢筋与结构型合成纤维混杂后对混凝土抗冲击性能的影响，采用改进的自由落球冲击试验装置，对素混凝土、钢筋混凝土、结构型合成纤维增强混凝土以及钢筋－结构型合成纤维混杂增强的混凝土试件的抗冲击性能进行了试验研究，分析了钢筋、结构型合成纤维以及钢筋与结构型合成纤维混杂后对混凝土抗冲击性能的影响及其增强机理。同时，利用 Weibull 分布理论分析了试件初裂冲击次数和破坏冲击次数的分布规律。研究表明：结构型合成纤维可以提高混凝土抗冲击性能；对于提高混凝土的抗冲击性能，钢筋与结构型合成纤维表现出显著的正混杂效应；两参数Weibull 分布能较好的描述钢筋－结构型合成纤维混凝土抗冲击次数的分布特征。