Yield line-based design of fibre reinforced concrete: assessment of suitability of material models

IF 1.8 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Ajeesh Koorikkattil, S. K. Nayar, Veena Venudharan
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Abstract

The present research is intended to address the adequacy of flexural toughness-based material models such as equivalent and residual flexural strength, and the deflection limits at which these parameters are estimated for design of fibre reinforced concrete (FRC), for various applications such as slabs-on-grade/pavements. The work is an experimental study using FRC concrete mixes with individual and hybrid combinations of hooked-end steel (SF) and macro polypropylene fibres (PF). The experimental investigation consisted of toughness testing unnotched and notched prisms and square slabs, prepared with a typical grade of concrete used for FRC pavement applications. To validate the material models, a comparison was made between the theoretical moment/load calculated based on material flexural toughness parameters and the actual moment obtained from slabs using actual yield line formed during testing. From the study it is observed that overall, both equivalent (from unnotched prism test) and residual (from notched prism test) flexural strength, are suitable for designing FRC slabs, however the equivalent strength parameter shows better correlation to the slab response. The results also indicate that the hybrid mixes of PF and SF, with a higher volume fraction of 0.6% Vf, shows a marginal increase in flexural performance, in comparison to the mixes with lower volume fraction but no or minimal synergy due to hybridisation.
基于屈服线的纤维增强混凝土设计:材料模型适用性评估
本研究旨在解决基于挠曲韧性的材料模型(如等效挠曲强度和残余挠曲强度)的适当性问题,以及这些参数在纤维增强混凝土(FRC)设计中的挠曲极限估算问题,适用于各种应用,如级配板/路面。这项工作是一项实验研究,使用的是含有单独和混合的钩端钢纤维(SF)和大聚丙烯纤维(PF)的 FRC 混凝土拌合物。实验研究包括无缺口和有缺口棱柱体和方形板的韧性测试,这些棱柱体和方形板是用 FRC 路面应用的典型等级混凝土制备的。为了验证材料模型,将根据材料弯曲韧性参数计算出的理论力矩/荷载与使用测试过程中形成的实际屈服线从板上获得的实际力矩进行了比较。研究结果表明,总体而言,等效(来自无缺口棱柱试验)和残余(来自缺口棱柱试验)抗弯强度都适用于设计 FRC 板,但等效强度参数与板响应的相关性更好。研究结果还表明,与体积分数较低但没有或仅有少量混合协同作用的混合材料相比,体积分数较高的 PF 和 SF 混合材料(体积分数为 0.6% Vf)的抗弯性能略有提高。
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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来源期刊
Magazine of Concrete Research
Magazine of Concrete Research 工程技术-材料科学:综合
CiteScore
4.60
自引率
11.10%
发文量
102
审稿时长
5 months
期刊介绍: For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.
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