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Permanent link (DOI): https://doi.org/10.7939/R3792W

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Shear in Steel Fiber Reinforced Concrete Members without Stirrups Open Access

Descriptions

Other title
Subject/Keyword
Analytical Shear Modeling
Toughness factor
Mechanical Properties
Members without Stirrups
Normal Strength
Direct Shear Test
Large-scale
Beams without Web Reinforcement
High Strength
Shear
Beams without Stirrups
Steel Fiber Reinforced Concrete
Lightweight
Shear Modeling
Size Effect
SFRC
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Shoaib, Abdoladel
Supervisor and department
Bindiganavile, Vivek (Civil and Environmental Engineering)
Lubell, Adam (Civil and Environmental Engineering)
Examining committee member and department
Lubell, Adam (Civil and Environmental Engineering)
Apel, Derek (Civil and Environmental Engineering)
Bindiganavile, Vivek (Civil and Environmental Engineering)
Grondin, Gilbert (Civil and Environmental Engineering)
Mertiny, Pierre (Mechanical Engineering)
Sheikh, Shamim (Civil Engineering, University of Toronto)
Department
Department of Civil and Environmental Engineering
Specialization
Structural Engineering
Date accepted
2012-06-11T09:06:45Z
Graduation date
2012-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Hooked end steel fibers were included between 0~1% by volume to provide enhanced shear resistance to three different types of steel fiber reinforced concrete (SFRC) namely, a regular concrete mix, a lightweight aggregate mix and a high strength mix. The test results at the material scale showed a substantial increase in the shear strength of regular and high strength concrete, but only limited enhancement in the case of the lightweight aggregate concrete. The steel fibers were most efficient in enhancing the post-peak shear performance in the regular concrete, where the cracks progressed around the coarse aggregate. The fractured surface of the specimens revealed that in the lightweight and high strength mixes, cleavage was through the aggregates. A total of 18 structural SFRC specimens were designed and constructed to capture the behavior of shear-critical SFRC members. The specimens contained longitudinal reinforcement but no stirrups, and utilized different mixes with 1% fiber content selected from the material scale testing phase. The specimens varied in overall height from 308 to 1000 mm with constant shear span to effective depth ratio of 3. The normalized shear stress at failure decreased with an increase in the specimen total depth, indicating that a size effect exists for SFRC specimens without stirrups. However, adding steel fibers into the concrete matrix considerably enhanced the shear capacity compared to the ACI 318-08 and CSA A23.3-04 predictions for RC members without steel fibers. An analytical shear capacity model was developed based on mechanical principles and empirical measurements of crack geometry observed in the current study for both normal weight and lightweight SFRC members without stirrups. The analytical model was then further simplified to be suitable for use in design. For validation, shear capacity predictions were examined for a large database and gave reliable and accurate predictions. The prediction quality of the proposed design model was also compared against published SFRC shear models from other researchers. Among the SFRC shear models studied, the proposed design model was the most accurate model in prediction quality and relatively the least sensitive model to different common design variables.
Language
English
DOI
doi:10.7939/R3792W
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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