Numerical analysis on static load capacity of prestressed concrete sleepers under hypothetical bearing pressure distribution

Prestressed concrete sleepers are currently designed based on permissible stresses concepts resulting from quasi-static wheel loads. It was designed to exceed the mean working load to avoid loss of bond in the prestressing due to cracking of the concrete sleepers. These loads allow for static respon...

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Main Author:	Wan Abdul Rashid, Wan Azlan
Format:	Thesis
Language:	English
Published:	2012
Subjects:	T Technology (General)
Online Access:	http://eprints.utm.my/id/eprint/10022/1/WanAzlanAbdulMFKA2012.pdf
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id	my-utm-ep.10022
record_format	uketd_dc
spelling	my-utm-ep.100222018-05-27T03:19:37Z Numerical analysis on static load capacity of prestressed concrete sleepers under hypothetical bearing pressure distribution 2012-01 Wan Abdul Rashid, Wan Azlan T Technology (General) TA Engineering (General). Civil engineering (General) Prestressed concrete sleepers are currently designed based on permissible stresses concepts resulting from quasi-static wheel loads. It was designed to exceed the mean working load to avoid loss of bond in the prestressing due to cracking of the concrete sleepers. These loads allow for static response of the sleeper due to the mechanism of vertical load transfer between the rail and sleeper as well as the sleeper and ballast interaction. In practice, the designer apply uniform pressure distribution beneath each rail seat which is dependent on the track gauge and sleeper length as stipulated in many design standards. Applying uniform pressure distribution beneath each rail seat may not be necessarily applicable to all in-situ sleepers as the contact pressure distribution between sleepers and ballast is mainly influenced by the cumulative effect of the traffic loading at various speeds over a period of time as well as the quality of ballast maintenance. A significant amount of research has been conducted by researchers worldwide over the century in postulating a set of hypothetical contact pressure distribution on the sleeper-ballast interaction. This leads to predicament as to whether the designed sleepers under the assumption of uniform contact pressure distribution had the adequate static load capacity to withstand the designed vertical loading but under different contact pressure distribution pattern. To solve this predicament, numerical analysis using commercially available finite element package, LUSAS, is carried out and comparison is made with the experimental test results in validating the finite element model. The numerical analysis will be useful in predicting the maximum vertical loading prior to the cracking of the sleeper under various hypothetical contact pressure distribution patterns. From numerical analysis, prestressed concrete sleeper that is placed on ballast has reserve strength in static load capacity with a factor between 2.2 and 2.4 of the positive rail seat test load at crack initiation. 2012-01 Thesis http://eprints.utm.my/id/eprint/10022/ http://eprints.utm.my/id/eprint/10022/1/WanAzlanAbdulMFKA2012.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	T Technology (General) T Technology (General)
spellingShingle	T Technology (General) T Technology (General) Wan Abdul Rashid, Wan Azlan Numerical analysis on static load capacity of prestressed concrete sleepers under hypothetical bearing pressure distribution
description	Prestressed concrete sleepers are currently designed based on permissible stresses concepts resulting from quasi-static wheel loads. It was designed to exceed the mean working load to avoid loss of bond in the prestressing due to cracking of the concrete sleepers. These loads allow for static response of the sleeper due to the mechanism of vertical load transfer between the rail and sleeper as well as the sleeper and ballast interaction. In practice, the designer apply uniform pressure distribution beneath each rail seat which is dependent on the track gauge and sleeper length as stipulated in many design standards. Applying uniform pressure distribution beneath each rail seat may not be necessarily applicable to all in-situ sleepers as the contact pressure distribution between sleepers and ballast is mainly influenced by the cumulative effect of the traffic loading at various speeds over a period of time as well as the quality of ballast maintenance. A significant amount of research has been conducted by researchers worldwide over the century in postulating a set of hypothetical contact pressure distribution on the sleeper-ballast interaction. This leads to predicament as to whether the designed sleepers under the assumption of uniform contact pressure distribution had the adequate static load capacity to withstand the designed vertical loading but under different contact pressure distribution pattern. To solve this predicament, numerical analysis using commercially available finite element package, LUSAS, is carried out and comparison is made with the experimental test results in validating the finite element model. The numerical analysis will be useful in predicting the maximum vertical loading prior to the cracking of the sleeper under various hypothetical contact pressure distribution patterns. From numerical analysis, prestressed concrete sleeper that is placed on ballast has reserve strength in static load capacity with a factor between 2.2 and 2.4 of the positive rail seat test load at crack initiation.
format	Thesis
qualification_level	Master's degree
author	Wan Abdul Rashid, Wan Azlan
author_facet	Wan Abdul Rashid, Wan Azlan
author_sort	Wan Abdul Rashid, Wan Azlan
title	Numerical analysis on static load capacity of prestressed concrete sleepers under hypothetical bearing pressure distribution
title_short	Numerical analysis on static load capacity of prestressed concrete sleepers under hypothetical bearing pressure distribution
title_full	Numerical analysis on static load capacity of prestressed concrete sleepers under hypothetical bearing pressure distribution
title_fullStr	Numerical analysis on static load capacity of prestressed concrete sleepers under hypothetical bearing pressure distribution
title_full_unstemmed	Numerical analysis on static load capacity of prestressed concrete sleepers under hypothetical bearing pressure distribution
title_sort	numerical analysis on static load capacity of prestressed concrete sleepers under hypothetical bearing pressure distribution
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2012
url	http://eprints.utm.my/id/eprint/10022/1/WanAzlanAbdulMFKA2012.pdf
_version_	1747814786937126912

Numerical analysis on static load capacity of prestressed concrete sleepers under hypothetical bearing pressure distribution

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