Abstract
This paper presents the results of an experimental research designed to investigate the dynamic mechanical properties and constitutive model of fiber reinforced concrete (FRC), including steel fiber reinforced concrete (SFRC) and polypropylene fiber reinforced concrete (PFRC) under fast loading. Experimental results are achieved by using the electrohydraulic servo loading test method, implying that the dynamic mechanical properties of PFRC and SFRC, such as peak stress, peak strain, and toughness, are positively affected by strain rate. The experimental elastic modulus test results of FRC with different fiber contents indicate that the elastic modulus is positively affected by polypropylene or steel fibers and increases with the increment of fiber content. Finally, the experimental stress-strain curves obtained in the MTS electrohydraulic servo system test are fitted by a damage dynamic constitutive model of FRC. The good fitting with experimental results proves that the model could be appropriate to describe the dynamic mechanical properties of FRC.
Highlights
With the development of modern building structures, the defects of ordinary concrete, such as high self-weight, poor toughness, and low tensile strength can be seen as limits to its application and development in structure [1, 2]
Cao and Liu [12] investigated that the impact resistance of polypropylene fiber reinforced concrete (PFRC) with 0.1%∼0.2% volume fraction could be increased by 4∼6 times. en, the author investigated the performance of multidimensional fiber reinforced concrete (FRC) that mixed short steel fibers with long fibers to prepare graded fibers for experimental research
It is evident that FRC is a strain rate sensitive material, but few people considered the effect of strain rate on the dynamic constitutive model. erefore, this paper aims at providing further research on the dynamic mechanical properties of FRC subjected to compressive impact loading
Summary
With the development of modern building structures, the defects of ordinary concrete, such as high self-weight, poor toughness, and low tensile strength can be seen as limits to its application and development in structure [1, 2]. Erefore, further studies of the dynamic behavior of FRC subjected to impact loading are necessary for its design and application It has been proved by experimental results that the dynamic compressive strength and toughness of concrete matrix are remarkably enhanced by adding polypropylene fibers [10, 11]. Erefore, this paper aims at providing further research on the dynamic mechanical properties (i.e., peak strain, peak stress, and toughness) of FRC subjected to compressive impact loading. On the basis of experimental results, the dynamic constitutive relationships of SFRC and PFRC are established correctly by analyzing the influence of fiber content and strain rate on the mechanical properties of concrete. On the basis of experimental results, the dynamic constitutive relationships of SFRC and PFRC are established correctly by analyzing the influence of fiber content and strain rate on the mechanical properties of concrete. is paper could be helpful to understand the dynamic mechanical properties and constitutive relationship of FRC more deeply, which could promote the wider application of FRC in engineering
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