Lessons learnt from blind competition of shear behavior of fiber‐reinforced concrete T‐beam
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Published:2023-02-09
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Volume:
Page:
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ISSN:1464-4177
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Container-title:Structural Concrete
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language:en
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Short-container-title:Structural Concrete
Author:
Skadins Ulvis1,
Cervenka Jan2
Affiliation:
1. Department of Structural Engineering Latvia University of Life Sciences and Technologies Jelgava Latvia
2. Org Division, Cervenka Consulting s.r.o. Prague Czech Republic
Abstract
AbstractThe positive effect of fiber‐reinforced concrete (FRC) on shear capacity of reinforced concrete beams is well presented in many experimental studies since 1970s. However, as the main effect of fibers is in the cracking stage, it increases the complexity to analyze such structures numerically. With the increased availability of nonlinear finite element analysis software, structural designers are encouraged to use them to solve complex structural problems. In such cases, understanding and correct definition of material laws in cracked stage of FRC structures are crucial. A blind competition was organized by fib WG 2.4.2 to address this issue. It revealed that the numerical predictions of almost all of the participants overestimated the shear capacity of a T‐beam subjected to bending. The aim of the current study is to demonstrate critical aspects in the definition of input parameters of FRC analysis. A comprehensive parametric analysis is performed considering tensile softening law, shear stiffness, and shear strength definition in cracked stage as well as shrinkage effects. The results suggest that most important aspect is the correct definition of tensile softening law, which should correspond to the lower bound of residual strength obtained by standard notched prisms tests according to EN 14651 or even smaller.
Funder
European Regional Development Fund
Subject
Mechanics of Materials,General Materials Science,Building and Construction,Civil and Structural Engineering
Reference45 articles.
1. EN 14651:2005.2007.Test method for metallic fibre concrete–measuring the flexural tensile strength (limit of proportionality (LOP) residual). European Standard: EN 14651:2005+A1:2007: E.CEN.
2. Steel fibers as shear reinforcement in beams;Batson G;ACI J Proc,1972
3. The effectiveness of steel fibers as shear reinforcement;Swamy RN;Concr Int,1985