Behaviour of unbonded reinforcement bar anchored in grouted spiral under increasing flexural bending

This project report presents a research on the behaviour of beam with unbonded reinforcement bars being anchored into grouted spiral reinforcement at both ends and subjected to flexural loading. The use of spiral reinforcement is rather a new concept used in construction industry and still being stu...

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Main Author:	Yap, Sie Horng
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/33090/1/YapSieHorngMFKA2013.pdf
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id	my-utm-ep.33090
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spelling	my-utm-ep.330902017-09-18T07:31:43Z Behaviour of unbonded reinforcement bar anchored in grouted spiral under increasing flexural bending 2013-01 Yap, Sie Horng TA Engineering (General). Civil engineering (General) This project report presents a research on the behaviour of beam with unbonded reinforcement bars being anchored into grouted spiral reinforcement at both ends and subjected to flexural loading. The use of spiral reinforcement is rather a new concept used in construction industry and still being studied on its application. Spiral reinforcement is believed to improve the bonding between concrete and steel, and currently being used in precast concrete connection. A series of laboratory testing was carried out to obtain required values which demonstrate the behaviour of beam anchored with spiral reinforcement. Total of six concrete beam specimens containing grouted spiral reinforcement were constructed and tested for flexural capacity, deflection and bond-slip of reinforcement. The parameters included in study were different inner diameter (33mm and 58mm) and pitch distance (15mm and 30mm) of spiral reinforcement. By using simple statistically and graphical method, analysis was carried out to determine the effectiveness of end anchorage in providing full flexural resistance to the concrete beam. The results were analysed for bond stress around the reinforcement bar under the effect of spiral confinement. Comparisons of results are carried to determine the influence of inner diameter and pitch distance of spiral reinforcement to the flexural capacity of concrete beam. From the test and analysis, it is found that even with unbonded reinforcement, the grouted spiral reinforcement at beam ends were able to provide full tension support to concrete beam in resisting flexural loading. Despite the unbonded section of reinforcement, the concrete beam able to sustain higher flexural load, estimate 23% more than typical concrete beam. The test also showed that increment in inner diameter or pitch distance of spiral reinforcement will reduce the bond strength between grout and reinforcement bar and subsequently reduced the flexural capacity of the concrete beam. 2013-01 Thesis http://eprints.utm.my/id/eprint/33090/ http://eprints.utm.my/id/eprint/33090/1/YapSieHorngMFKA2013.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	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Yap, Sie Horng Behaviour of unbonded reinforcement bar anchored in grouted spiral under increasing flexural bending
description	This project report presents a research on the behaviour of beam with unbonded reinforcement bars being anchored into grouted spiral reinforcement at both ends and subjected to flexural loading. The use of spiral reinforcement is rather a new concept used in construction industry and still being studied on its application. Spiral reinforcement is believed to improve the bonding between concrete and steel, and currently being used in precast concrete connection. A series of laboratory testing was carried out to obtain required values which demonstrate the behaviour of beam anchored with spiral reinforcement. Total of six concrete beam specimens containing grouted spiral reinforcement were constructed and tested for flexural capacity, deflection and bond-slip of reinforcement. The parameters included in study were different inner diameter (33mm and 58mm) and pitch distance (15mm and 30mm) of spiral reinforcement. By using simple statistically and graphical method, analysis was carried out to determine the effectiveness of end anchorage in providing full flexural resistance to the concrete beam. The results were analysed for bond stress around the reinforcement bar under the effect of spiral confinement. Comparisons of results are carried to determine the influence of inner diameter and pitch distance of spiral reinforcement to the flexural capacity of concrete beam. From the test and analysis, it is found that even with unbonded reinforcement, the grouted spiral reinforcement at beam ends were able to provide full tension support to concrete beam in resisting flexural loading. Despite the unbonded section of reinforcement, the concrete beam able to sustain higher flexural load, estimate 23% more than typical concrete beam. The test also showed that increment in inner diameter or pitch distance of spiral reinforcement will reduce the bond strength between grout and reinforcement bar and subsequently reduced the flexural capacity of the concrete beam.
format	Thesis
qualification_level	Master's degree
author	Yap, Sie Horng
author_facet	Yap, Sie Horng
author_sort	Yap, Sie Horng
title	Behaviour of unbonded reinforcement bar anchored in grouted spiral under increasing flexural bending
title_short	Behaviour of unbonded reinforcement bar anchored in grouted spiral under increasing flexural bending
title_full	Behaviour of unbonded reinforcement bar anchored in grouted spiral under increasing flexural bending
title_fullStr	Behaviour of unbonded reinforcement bar anchored in grouted spiral under increasing flexural bending
title_full_unstemmed	Behaviour of unbonded reinforcement bar anchored in grouted spiral under increasing flexural bending
title_sort	behaviour of unbonded reinforcement bar anchored in grouted spiral under increasing flexural bending
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2013
url	http://eprints.utm.my/id/eprint/33090/1/YapSieHorngMFKA2013.pdf
_version_	1747816077180534784

Behaviour of unbonded reinforcement bar anchored in grouted spiral under increasing flexural bending

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