Size Effect of Synthetic Fibre Reinforced Concrete – Investigation using a Semi-Discrete Analytical Beam Model

IF 0.5 Q4 ENGINEERING, CIVIL
Mária Erdélyiné Tóth, Anikó Pluzsik
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Abstract

Abstract The size effect is a well-known characteristic of concrete structures. However, in the case of fibre-reinforced concrete (FRC), this issue is not thoroughly explored. Most design recommendations of FRC neglect the size effect or handle the behaviour of FRC structures in case of different structural sizes similar to plain concrete structures (assuming FRC is a homogeneous material). The aim of this paper is to show that the size effect of FRC can be divided, the share of the concrete matrix and the fibres in the size-dependent properties is separable. For the size effect research fifteen synthetic macro fibre reinforced concrete and six plain concrete beam specimens were prepared and tested in three different sizes and then evaluated with the semi-discrete analytical (SDA) model. The analysis of the experimental specimens has shown that the size effect significantly influences the concrete material in the case of FRC with softening material behaviour, but the residual loadbearing capacity which mainly arise from the local bridging effect of fibres is essentially independent of the structural size. It is also shown in this paper that the two defining parameters of the SDA model is independent of the structural size, so the model provides an excellent tool in case of the design of real-sized FRC structures.
合成纤维增强混凝土的尺寸效应——用半离散解析梁模型进行研究
摘要尺寸效应是混凝土结构的一个众所周知的特性。然而,在纤维增强混凝土(FRC)的情况下,这个问题没有深入探讨。大多数关于FRC的设计建议忽略了尺寸效应或处理了FRC结构在类似素混凝土结构的不同结构尺寸情况下的行为(假设FRC是一种均质材料)。本文的目的是表明FRC的尺寸效应是可以分割的,混凝土基体和纤维在尺寸依赖性能中的份额是可分离的。在尺寸效应研究中,制备了15个合成宏观纤维混凝土梁试件和6个素混凝土梁试件,分别进行了3种不同尺寸的试验,并用半离散分析(SDA)模型进行了评价。对试验试件的分析表明,在FRC具有软化材料特性的情况下,尺寸效应对混凝土材料有显著影响,但主要由纤维局部桥接效应产生的剩余承载能力基本上与结构尺寸无关。本文还表明,SDA模型的两个定义参数与结构尺寸无关,因此该模型为实际尺寸FRC结构的设计提供了很好的工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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