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Numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth

The interface between old and new concrete in structural extension and repair is crucial for maintaining structural integrity and load-bearing capacity. Previous studies have focused on the impact of surface roughness texture on the behaviour of the concrete-to-concrete interface, but there is lim...

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Main Author:	Tey, Yee Chean
Format:	Final Year Project / Dissertation / Thesis
Published:	2024
Subjects:	T Technology (General) TA Engineering (General). Civil engineering (General)
Online Access:	http://eprints.utar.edu.my/6419/1/1901950_FYP_Report_%2D_YEE_CHEAN_TEY.pdf http://eprints.utar.edu.my/6419/
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id	my-utar-eprints.6419
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spelling	my-utar-eprints.64192024-06-19T02:07:15Z Numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth Tey, Yee Chean T Technology (General) TA Engineering (General). Civil engineering (General) The interface between old and new concrete in structural extension and repair is crucial for maintaining structural integrity and load-bearing capacity. Previous studies have focused on the impact of surface roughness texture on the behaviour of the concrete-to-concrete interface, but there is limited research on the effect of manipulating the roughness tooth parameter on the shear behaviour. To address this research gap, this study conducts a numerical investigation to examine the effectiveness of rectangular roughness tooth on the shear behaviour of the old-to-new concrete interface. This study used a double shear test setup and the finite element method to conduct a parametric study, exploring the relationship between tooth thickness and shear capacity, as well as the effect of confining pressure on the effectiveness of the rectangular tooth. The concrete interface parameter is calibrated using two reference specimens, followed by 18 test specimens with varying roughness tooth thickness (ranging from 30 mm to 70 mm) to conduct the parametric study. The findings indicate that increasing the tooth thickness positively impacts the ultimate shear capacity of the concrete interface. Specifically, there is a significant increase of 15.81% for the specimen batch without confining pressure and 14.87% for the specimen batch with confining pressure as tooth thickness increased from 30 mm to 70 mm. These results are supported by high coefficients of determination (R2) of 0.9206 and 0.9976, respectively. Additionally, the presence of confining pressure leads to an average increase of 19% in shear capacity. Interestingly, the results demonstrate that the existence of confining pressure does not affect the degree of influence of tooth thickness on shear strength, as the increase in ultimate shear capacity in both batches is not significantly different. Hence, it underscores the importance of considering the tooth thickness, when designing the surface roughness texture of concrete in structural extension and repair projects to achieve optimal structural performance. 2024 Final Year Project / Dissertation / Thesis NonPeerReviewed application/pdf http://eprints.utar.edu.my/6419/1/1901950_FYP_Report_%2D_YEE_CHEAN_TEY.pdf Tey, Yee Chean (2024) Numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth. Final Year Project, UTAR. http://eprints.utar.edu.my/6419/
institution	Universiti Tunku Abdul Rahman
building	UTAR Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Tunku Abdul Rahman
content_source	UTAR Institutional Repository
url_provider	http://eprints.utar.edu.my
topic	T Technology (General) TA Engineering (General). Civil engineering (General)
spellingShingle	T Technology (General) TA Engineering (General). Civil engineering (General) Tey, Yee Chean Numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth
description	The interface between old and new concrete in structural extension and repair is crucial for maintaining structural integrity and load-bearing capacity. Previous studies have focused on the impact of surface roughness texture on the behaviour of the concrete-to-concrete interface, but there is limited research on the effect of manipulating the roughness tooth parameter on the shear behaviour. To address this research gap, this study conducts a numerical investigation to examine the effectiveness of rectangular roughness tooth on the shear behaviour of the old-to-new concrete interface. This study used a double shear test setup and the finite element method to conduct a parametric study, exploring the relationship between tooth thickness and shear capacity, as well as the effect of confining pressure on the effectiveness of the rectangular tooth. The concrete interface parameter is calibrated using two reference specimens, followed by 18 test specimens with varying roughness tooth thickness (ranging from 30 mm to 70 mm) to conduct the parametric study. The findings indicate that increasing the tooth thickness positively impacts the ultimate shear capacity of the concrete interface. Specifically, there is a significant increase of 15.81% for the specimen batch without confining pressure and 14.87% for the specimen batch with confining pressure as tooth thickness increased from 30 mm to 70 mm. These results are supported by high coefficients of determination (R2) of 0.9206 and 0.9976, respectively. Additionally, the presence of confining pressure leads to an average increase of 19% in shear capacity. Interestingly, the results demonstrate that the existence of confining pressure does not affect the degree of influence of tooth thickness on shear strength, as the increase in ultimate shear capacity in both batches is not significantly different. Hence, it underscores the importance of considering the tooth thickness, when designing the surface roughness texture of concrete in structural extension and repair projects to achieve optimal structural performance.
format	Final Year Project / Dissertation / Thesis
author	Tey, Yee Chean
author_facet	Tey, Yee Chean
author_sort	Tey, Yee Chean
title	Numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth
title_short	Numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth
title_full	Numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth
title_fullStr	Numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth
title_full_unstemmed	Numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth
title_sort	numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth
publishDate	2024
url	http://eprints.utar.edu.my/6419/1/1901950_FYP_Report_%2D_YEE_CHEAN_TEY.pdf http://eprints.utar.edu.my/6419/
_version_	1802982276811718656
score	13.211869

Numerical investigation on shear behaviour of old-to-new concrete interface with rectangular roughness tooth

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