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Behaviour of Reinforced Concrete Deep Beams with Openings in the Shear Zone

Reinforced concrete (RC) deep beams are useful in high rise building to support high loading in a structure. In RC deep beam construction, openings are usually provided in beam for accessibility purpose and to accommodate essential services such as power supply, ventilation system and network system...

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Main Authors: Chin, Siew Choo, Doh, Shu Ing
Format: Book Section
Language:English
Published: Universiti Teknikal Malaysia Melaka (UTeM) 2015
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://umpir.ump.edu.my/id/eprint/7600/1/Behaviour_of_Reinforced_Concrete_Deep_Beams_with_Openings_in_the_Shear_Zone.pdf
http://umpir.ump.edu.my/id/eprint/7600/
http://ocs.utem.edu.my/index.php/mucet2014/MUCET2014/paper/viewFile/43/57
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spelling my.ump.umpir.76002018-02-21T06:24:05Z http://umpir.ump.edu.my/id/eprint/7600/ Behaviour of Reinforced Concrete Deep Beams with Openings in the Shear Zone Chin, Siew Choo Doh, Shu Ing TA Engineering (General). Civil engineering (General) Reinforced concrete (RC) deep beams are useful in high rise building to support high loading in a structure. In RC deep beam construction, openings are usually provided in beam for accessibility purpose and to accommodate essential services such as power supply, ventilation system and network system access. However, the presence of openings in deep beams may lead to many problems in the beam behaviour such as reduction in the beam capacity, cause excessive cracking and deflection. Hence, this study was conducted in order to study the behaviour of RC deep beams openings. Two openings, one in each shear span, were placed symmetrically at the top of shear span near support about the mid-point of the beam. Test parameters included the opening size and shape. The openings were circular and square in shape. The sizes of the openings considered in this study include 150 mm, 200 mm and 250 mm for circular whereas the size of square shape includes 150x150 mm, 200x200 mm and 250x250 mm. All the beam specimens had a cross-section of 100 mm x 500 mm and a total length of 1200 mm. The beams were tested under four-point bending until failure. The results in terms of load deflection behaviour and crack patterns were discussed. From the results obtained, the provision of circular opening with the diameter considered could reduce the beam capacity to a range of 30 – 35% of the original beam capacity. Meanwhile, the inclusion of square openings with openings of the considered dimension causes a significant loss of beam strength, about 40 – 80% as compared to the beam capacity of the solid beam. This shows that the greater the opening size, the more significant is the reduction of beam capacity with more severe and excessive diagonal shear cracks. Comparing in terms of shape, circular opening is the most suitable option to be provided in RC beams as square openings consists of sharp corners which is subjected to high stress concentration that leads to initial cracking in beam. Universiti Teknikal Malaysia Melaka (UTeM) 2015 Book Section NonPeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/7600/1/Behaviour_of_Reinforced_Concrete_Deep_Beams_with_Openings_in_the_Shear_Zone.pdf Chin, Siew Choo and Doh, Shu Ing (2015) Behaviour of Reinforced Concrete Deep Beams with Openings in the Shear Zone. In: Proceeding Book Mucet 2014 : Engineering & Technology. Universiti Teknikal Malaysia Melaka (UTeM), Melaka, pp. 107-112. ISBN 978-967-0257-53-2 http://ocs.utem.edu.my/index.php/mucet2014/MUCET2014/paper/viewFile/43/57
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Chin, Siew Choo
Doh, Shu Ing
Behaviour of Reinforced Concrete Deep Beams with Openings in the Shear Zone
description Reinforced concrete (RC) deep beams are useful in high rise building to support high loading in a structure. In RC deep beam construction, openings are usually provided in beam for accessibility purpose and to accommodate essential services such as power supply, ventilation system and network system access. However, the presence of openings in deep beams may lead to many problems in the beam behaviour such as reduction in the beam capacity, cause excessive cracking and deflection. Hence, this study was conducted in order to study the behaviour of RC deep beams openings. Two openings, one in each shear span, were placed symmetrically at the top of shear span near support about the mid-point of the beam. Test parameters included the opening size and shape. The openings were circular and square in shape. The sizes of the openings considered in this study include 150 mm, 200 mm and 250 mm for circular whereas the size of square shape includes 150x150 mm, 200x200 mm and 250x250 mm. All the beam specimens had a cross-section of 100 mm x 500 mm and a total length of 1200 mm. The beams were tested under four-point bending until failure. The results in terms of load deflection behaviour and crack patterns were discussed. From the results obtained, the provision of circular opening with the diameter considered could reduce the beam capacity to a range of 30 – 35% of the original beam capacity. Meanwhile, the inclusion of square openings with openings of the considered dimension causes a significant loss of beam strength, about 40 – 80% as compared to the beam capacity of the solid beam. This shows that the greater the opening size, the more significant is the reduction of beam capacity with more severe and excessive diagonal shear cracks. Comparing in terms of shape, circular opening is the most suitable option to be provided in RC beams as square openings consists of sharp corners which is subjected to high stress concentration that leads to initial cracking in beam.
format Book Section
author Chin, Siew Choo
Doh, Shu Ing
author_facet Chin, Siew Choo
Doh, Shu Ing
author_sort Chin, Siew Choo
title Behaviour of Reinforced Concrete Deep Beams with Openings in the Shear Zone
title_short Behaviour of Reinforced Concrete Deep Beams with Openings in the Shear Zone
title_full Behaviour of Reinforced Concrete Deep Beams with Openings in the Shear Zone
title_fullStr Behaviour of Reinforced Concrete Deep Beams with Openings in the Shear Zone
title_full_unstemmed Behaviour of Reinforced Concrete Deep Beams with Openings in the Shear Zone
title_sort behaviour of reinforced concrete deep beams with openings in the shear zone
publisher Universiti Teknikal Malaysia Melaka (UTeM)
publishDate 2015
url http://umpir.ump.edu.my/id/eprint/7600/1/Behaviour_of_Reinforced_Concrete_Deep_Beams_with_Openings_in_the_Shear_Zone.pdf
http://umpir.ump.edu.my/id/eprint/7600/
http://ocs.utem.edu.my/index.php/mucet2014/MUCET2014/paper/viewFile/43/57
_version_ 1643665657799114752
score 13.211869

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