Effect of Construction Joints on Performance of Reinforced Concrete Beams

Construction joints are stopping places in the process of placing concrete, and they are required because in many structures it is impractical to place concrete in one continuous operation. The amount of concrete that can be placed at one time is governed by the batching and mixing capacity and by t...

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Autor principal:	Zena Waleed Abass
Formato:	article
Lenguaje:	EN
Publicado:	Al-Khwarizmi College of Engineering – University of Baghdad 2012
Materias:	Construction joint reinforced concrete beams cracks in concrete. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/f3e49a55fcba47ad98148d5f9a2b0b7a
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spelling	oai:doaj.org-article:f3e49a55fcba47ad98148d5f9a2b0b7a2021-12-02T07:37:30ZEffect of Construction Joints on Performance of Reinforced Concrete Beams 1818-1171https://doaj.org/article/f3e49a55fcba47ad98148d5f9a2b0b7a2012-01-01T00:00:00Zhttp://www.iasj.net/iasj?func=fulltext&aId=24809https://doaj.org/toc/1818-1171Construction joints are stopping places in the process of placing concrete, and they are required because in many structures it is impractical to place concrete in one continuous operation. The amount of concrete that can be placed at one time is governed by the batching and mixing capacity and by the strength of the formwork. A good construction joint should provide adequate flexural and shear continuity through the interface.In this study, the effect of location of construction joints on the performance of reinforced concrete structural elements is experimentally investigated. Nineteen beam specimens with dimensions of 200×200×950 mm were tested. The variables investigated are the location of the construction joints (at midspan or at third point of the specimens), type of construction joints (vertical, inclined, and key construction joints), and presence of stirrups at these joints. The specimens were tested using 1000 kN computer controlled versatile electronic testing machine. The specimens were positioned in the machine so that the deflection at center andor at the location of construction joint was measured at each load step.The results of the experimental program indicated that the best location of the construction joint is at the point of minimum shear. It was found that the use of vertical construction joint has little effect on the overall behavior of beam specimens (the percentage of reduction in ultimate load capacity is in the range of 0% - 5%). While inclined construction joints results in a noticeable reduction in strength of beams relative to the strength of beam without construction joint the percentage of reduction in ultimate load capacity is in range of 8% - 20%.The presence of stirrups at the construction joints is an important variable, which affect the type of failure and load carrying capacity. It is found that adding of stirrups across the joint results in an increase in capacity in the range of (7%- 15%) and a decrease in deflection in the range of (20%- 48%).Zena Waleed AbassAl-Khwarizmi College of Engineering – University of BaghdadarticleConstruction jointreinforced concretebeamscracks in concrete.Chemical engineeringTP155-156Engineering (General). Civil engineering (General)TA1-2040ENAl-Khawarizmi Engineering Journal, Vol 8, Iss 1, Pp 48-64 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Construction joint reinforced concrete beams cracks in concrete. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Construction joint reinforced concrete beams cracks in concrete. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040 Zena Waleed Abass Effect of Construction Joints on Performance of Reinforced Concrete Beams
description	Construction joints are stopping places in the process of placing concrete, and they are required because in many structures it is impractical to place concrete in one continuous operation. The amount of concrete that can be placed at one time is governed by the batching and mixing capacity and by the strength of the formwork. A good construction joint should provide adequate flexural and shear continuity through the interface.In this study, the effect of location of construction joints on the performance of reinforced concrete structural elements is experimentally investigated. Nineteen beam specimens with dimensions of 200×200×950 mm were tested. The variables investigated are the location of the construction joints (at midspan or at third point of the specimens), type of construction joints (vertical, inclined, and key construction joints), and presence of stirrups at these joints. The specimens were tested using 1000 kN computer controlled versatile electronic testing machine. The specimens were positioned in the machine so that the deflection at center andor at the location of construction joint was measured at each load step.The results of the experimental program indicated that the best location of the construction joint is at the point of minimum shear. It was found that the use of vertical construction joint has little effect on the overall behavior of beam specimens (the percentage of reduction in ultimate load capacity is in the range of 0% - 5%). While inclined construction joints results in a noticeable reduction in strength of beams relative to the strength of beam without construction joint the percentage of reduction in ultimate load capacity is in range of 8% - 20%.The presence of stirrups at the construction joints is an important variable, which affect the type of failure and load carrying capacity. It is found that adding of stirrups across the joint results in an increase in capacity in the range of (7%- 15%) and a decrease in deflection in the range of (20%- 48%).
format	article
author	Zena Waleed Abass
author_facet	Zena Waleed Abass
author_sort	Zena Waleed Abass
title	Effect of Construction Joints on Performance of Reinforced Concrete Beams
title_short	Effect of Construction Joints on Performance of Reinforced Concrete Beams
title_full	Effect of Construction Joints on Performance of Reinforced Concrete Beams
title_fullStr	Effect of Construction Joints on Performance of Reinforced Concrete Beams
title_full_unstemmed	Effect of Construction Joints on Performance of Reinforced Concrete Beams
title_sort	effect of construction joints on performance of reinforced concrete beams
publisher	Al-Khwarizmi College of Engineering – University of Baghdad
publishDate	2012
url	https://doaj.org/article/f3e49a55fcba47ad98148d5f9a2b0b7a
work_keys_str_mv	AT zenawaleedabass effectofconstructionjointsonperformanceofreinforcedconcretebeams
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Effect of Construction Joints on Performance of Reinforced Concrete Beams

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