Fracture mechanics analysis of prestressed concrete railway sleepers containing fibres / Afidah Abu Bakar.

The Malaysian rail industry has developed tremendously over the last decade in order to play a major role in providing better alternative for road users. Taking a cue to future developments, sleeper demand will also increase. However, these prestressed concrete sleepers are mostly prestressed concre...

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Main Author:	Abu Bakar, Afidah
Format:	Thesis
Language:	English
Published:	2010
Subjects:	Railroads Rapid transit systems
Online Access:	https://ir.uitm.edu.my/id/eprint/43721/1/43721.pdf
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id	my-uitm-ir.43721
record_format	uketd_dc
spelling	my-uitm-ir.437212021-08-31T16:14:27Z Fracture mechanics analysis of prestressed concrete railway sleepers containing fibres / Afidah Abu Bakar. 2010 Abu Bakar, Afidah Railroads. Rapid transit systems Transportation (General works). Communication and traffic The Malaysian rail industry has developed tremendously over the last decade in order to play a major role in providing better alternative for road users. Taking a cue to future developments, sleeper demand will also increase. However, these prestressed concrete sleepers are mostly prestressed concrete types designed with less emphasis on dynamic irregularities of the train or the rails that generate fatigue loads. Cracks could develop during a train passage which can be a threat to the overall stiffness properties as they can propagate further under repeated loads. By utilising fibres, namely polypropylene as crack arresters, the behaviour of the sleeper would definitely change. Thus the research work presented in this thesis is focused on the performance of fibred prestressed concrete sleeper (HSFRC) under static and fatigue loads. Preliminary material study was carried out to select a new mix design of high strength concrete containing fibres. A major part of the laboratory investigation covered on the preparation of the sleeper itself and compliance to design requirements. There were no formations of cracks or crack propagations in the sleepers under constant and variable amplitude loads, testifying that fibres were effective in crack resistance. The proposed fibred-sleeper was capable to resist 97% of the yield strength after the occurrence of first crack and has a maximum strength capacity of 36% higher than the non-fibred sleeper (HSC). The residual strengths at post-fatigue remained almost similar for both types of sleepers depending on the cyclic stress ratios, but failures of the non-fibred sleepers were severe. Analysis sought by Linear Elastic Fracture Mechanics (LEFM) was extended using static test results and found that equivalent fatigue characteristics and life of sleepers had all been improved significantly. These include fracture toughness properties, stress intensities and crack growth rate. The fibres were effective to control cracks and its life is predicted at 86% more than the non-fibred sleepers. 2010 Thesis https://ir.uitm.edu.my/id/eprint/43721/ https://ir.uitm.edu.my/id/eprint/43721/1/43721.pdf text en public phd doctoral Universiti Teknologi MARA Faculty of Civil Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Railroads Rapid transit systems Railroads Rapid transit systems
spellingShingle	Railroads Rapid transit systems Railroads Rapid transit systems Abu Bakar, Afidah Fracture mechanics analysis of prestressed concrete railway sleepers containing fibres / Afidah Abu Bakar.
description	The Malaysian rail industry has developed tremendously over the last decade in order to play a major role in providing better alternative for road users. Taking a cue to future developments, sleeper demand will also increase. However, these prestressed concrete sleepers are mostly prestressed concrete types designed with less emphasis on dynamic irregularities of the train or the rails that generate fatigue loads. Cracks could develop during a train passage which can be a threat to the overall stiffness properties as they can propagate further under repeated loads. By utilising fibres, namely polypropylene as crack arresters, the behaviour of the sleeper would definitely change. Thus the research work presented in this thesis is focused on the performance of fibred prestressed concrete sleeper (HSFRC) under static and fatigue loads. Preliminary material study was carried out to select a new mix design of high strength concrete containing fibres. A major part of the laboratory investigation covered on the preparation of the sleeper itself and compliance to design requirements. There were no formations of cracks or crack propagations in the sleepers under constant and variable amplitude loads, testifying that fibres were effective in crack resistance. The proposed fibred-sleeper was capable to resist 97% of the yield strength after the occurrence of first crack and has a maximum strength capacity of 36% higher than the non-fibred sleeper (HSC). The residual strengths at post-fatigue remained almost similar for both types of sleepers depending on the cyclic stress ratios, but failures of the non-fibred sleepers were severe. Analysis sought by Linear Elastic Fracture Mechanics (LEFM) was extended using static test results and found that equivalent fatigue characteristics and life of sleepers had all been improved significantly. These include fracture toughness properties, stress intensities and crack growth rate. The fibres were effective to control cracks and its life is predicted at 86% more than the non-fibred sleepers.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abu Bakar, Afidah
author_facet	Abu Bakar, Afidah
author_sort	Abu Bakar, Afidah
title	Fracture mechanics analysis of prestressed concrete railway sleepers containing fibres / Afidah Abu Bakar.
title_short	Fracture mechanics analysis of prestressed concrete railway sleepers containing fibres / Afidah Abu Bakar.
title_full	Fracture mechanics analysis of prestressed concrete railway sleepers containing fibres / Afidah Abu Bakar.
title_fullStr	Fracture mechanics analysis of prestressed concrete railway sleepers containing fibres / Afidah Abu Bakar.
title_full_unstemmed	Fracture mechanics analysis of prestressed concrete railway sleepers containing fibres / Afidah Abu Bakar.
title_sort	fracture mechanics analysis of prestressed concrete railway sleepers containing fibres / afidah abu bakar.
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Civil Engineering
publishDate	2010
url	https://ir.uitm.edu.my/id/eprint/43721/1/43721.pdf
_version_	1783734700084297728

Fracture mechanics analysis of prestressed concrete railway sleepers containing fibres / Afidah Abu Bakar.

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