Effect of polypropylene and steel fibers on web-shear resistance of deep concrete hollow-core slabs

Twelve shear tests were conducted on fiber-reinforced precast/prestressed concrete hollow-core (PCHC) slabs to quantify the effectiveness of polypropylene (pp) and steel fibers (hooked and high-strength/straight types) on shear resistance. Different volume fractions of pp fibers (0.11 and 0.22%) and...

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Main Authors: Nguyen, Hang T. N., Tan, Kang Hai, Kanda, Tetsushi
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/154625
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1546252022-07-01T06:41:19Z Effect of polypropylene and steel fibers on web-shear resistance of deep concrete hollow-core slabs Nguyen, Hang T. N. Tan, Kang Hai Kanda, Tetsushi School of Civil and Environmental Engineering Engineering::Civil engineering Hollow-Core Slabs Steel Fibers Twelve shear tests were conducted on fiber-reinforced precast/prestressed concrete hollow-core (PCHC) slabs to quantify the effectiveness of polypropylene (pp) and steel fibers (hooked and high-strength/straight types) on shear resistance. Different volume fractions of pp fibers (0.11 and 0.22%) and steel fibers (0.51 and 0.89%) were investigated. The experimental results showed that there were moderate increases in shear strength with the use of pp fibers while substantial increases in shear resistance were observed with the use of steel fibers. In addition, shear strength increased with steel-fiber content. Moreover, with the same steel fiber content of 0.89%, specimens with high-strength/straight fibers exhibited superior performance in shear resistance compared to specimens using hooked steel fibers. In addition, web-shear failure occurred in the majority of specimens. However, as steel fiber content was increased up to 0.89%, in some instances, failure mode shifted from web-shear to flexural-shear failure. In addition, the 2010 fib model code formula for shear strength of steel-fiber-reinforced-concrete (SFRC) members was used to estimate shear capacity of the tested slabs using steel fibers. The calculations showed that the fib model code was overly conservative for shear-strength predictions of SFRC hollow-core slabs reported in this investigation. A semi-empirical formula to calculate shear strength of hollow-core slabs with steel fibers was proposed. It was verified using a database including the 6 shear-test results from this study and another 39 shear-tests on SFRC hollow-core slabs compiled from literature. The formula had a mean value of 1.12 for the ratio of experimental shear strength to calculated shear strength with a coefficient of variation of 0.21. Ministry of National Development (MND) National Research Foundation (NRF) The support of the National University of Civil Engineering (NUCE), Vietnam for granting the first author a sabbatical leave to carry out this research at the Nanyang Technological University, Singapore is highly appreciated. The authors also wish to acknowledge the first author’s scholarship and the funding for testing from the Singapore Ministry of National Development and National Research Foundation under L2 NIC Award No. L2NICCFP1-2013-4. 2021-12-29T08:00:40Z 2021-12-29T08:00:40Z 2020 Journal Article Nguyen, H. T. N., Tan, K. H. & Kanda, T. (2020). Effect of polypropylene and steel fibers on web-shear resistance of deep concrete hollow-core slabs. Engineering Structures, 210, 110273-. https://dx.doi.org/10.1016/j.engstruct.2020.110273 0141-0296 https://hdl.handle.net/10356/154625 10.1016/j.engstruct.2020.110273 2-s2.0-85079850405 210 110273 en L2NICCFP1-2013-4 Engineering Structures © 2020 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Hollow-Core Slabs
Steel Fibers
spellingShingle Engineering::Civil engineering
Hollow-Core Slabs
Steel Fibers
Nguyen, Hang T. N.
Tan, Kang Hai
Kanda, Tetsushi
Effect of polypropylene and steel fibers on web-shear resistance of deep concrete hollow-core slabs
description Twelve shear tests were conducted on fiber-reinforced precast/prestressed concrete hollow-core (PCHC) slabs to quantify the effectiveness of polypropylene (pp) and steel fibers (hooked and high-strength/straight types) on shear resistance. Different volume fractions of pp fibers (0.11 and 0.22%) and steel fibers (0.51 and 0.89%) were investigated. The experimental results showed that there were moderate increases in shear strength with the use of pp fibers while substantial increases in shear resistance were observed with the use of steel fibers. In addition, shear strength increased with steel-fiber content. Moreover, with the same steel fiber content of 0.89%, specimens with high-strength/straight fibers exhibited superior performance in shear resistance compared to specimens using hooked steel fibers. In addition, web-shear failure occurred in the majority of specimens. However, as steel fiber content was increased up to 0.89%, in some instances, failure mode shifted from web-shear to flexural-shear failure. In addition, the 2010 fib model code formula for shear strength of steel-fiber-reinforced-concrete (SFRC) members was used to estimate shear capacity of the tested slabs using steel fibers. The calculations showed that the fib model code was overly conservative for shear-strength predictions of SFRC hollow-core slabs reported in this investigation. A semi-empirical formula to calculate shear strength of hollow-core slabs with steel fibers was proposed. It was verified using a database including the 6 shear-test results from this study and another 39 shear-tests on SFRC hollow-core slabs compiled from literature. The formula had a mean value of 1.12 for the ratio of experimental shear strength to calculated shear strength with a coefficient of variation of 0.21.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Nguyen, Hang T. N.
Tan, Kang Hai
Kanda, Tetsushi
format Article
author Nguyen, Hang T. N.
Tan, Kang Hai
Kanda, Tetsushi
author_sort Nguyen, Hang T. N.
title Effect of polypropylene and steel fibers on web-shear resistance of deep concrete hollow-core slabs
title_short Effect of polypropylene and steel fibers on web-shear resistance of deep concrete hollow-core slabs
title_full Effect of polypropylene and steel fibers on web-shear resistance of deep concrete hollow-core slabs
title_fullStr Effect of polypropylene and steel fibers on web-shear resistance of deep concrete hollow-core slabs
title_full_unstemmed Effect of polypropylene and steel fibers on web-shear resistance of deep concrete hollow-core slabs
title_sort effect of polypropylene and steel fibers on web-shear resistance of deep concrete hollow-core slabs
publishDate 2021
url https://hdl.handle.net/10356/154625
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