Effect of small transverse service holes on shear strength of reinforced concrete slender beams

Olanitori, Lekan Makanju; Tifase, T.O.

doi:10.4314/jasem.v23i3.25

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…British Standard Institution [4] defines a deep beam as a member whose span is less or equal to 3 times the overall section depth. Hence slender beam can be said to be beam whose span is greater than 3 times the overall section depth [5]. Research work into the behaviour of deep beams with ducts has been carried out extensively; however, research into the behaviour of slender beams with big service openings is rare and attracts little or no attention.…”

Section: Introductionmentioning

confidence: 99%

“…Olanitori and Tifase [9], noted that the decrease in the flexural strength of the beam with small opening at the centre was between 39.62% and 42.64%, while that of the beam with the small opening at supports is between 6.0% and 14.67%. Olanitori and Tifase [5], investigated the effect of small transverse openings on shear strength of reinforced concrete slender beams. The study shows that the ultimate load of beams with service holes depends on the size of holes, position of holes, and of type loading.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Large Openings on Bending Strength of Reinforced Concrete Beam

Olanitori

Otuaga²,

Oso³

2022

JERR

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At the design stage of beams, openings for service ducts are rarely taking into consideration. The introduction of openings for service ducts have negative effects on the strength characteristics of beams, hence the focus of this research is to investigate the effect of large service openings on the ultimate load of reinforced concrete beams produced from locally available materials. A total of ten beams were cast using 20.8 N/mm² concrete grade. The cross-sectional dimensions of the beams were 100mm x 150mm and 1000 mm length, with effective span of 750 mm. The tested beams consisted of two control beams. The experimental beams consisted of eight beams, four of the beams were with 40 mm service openings (with two beams having openings at the centre and two beams having openings at the supports) and the other four beams had 50 mm service holes (with two beams having openings at the centre and two beams having openings at the supports). The reinforced concrete beams were cured by covering it with wet cloths and tested at 28th day. The control beams and experimental beams were subjected to point loads at the beam centre to study the effect of the openings on the ultimate load. The average actual ultimate load for the experimental beams with 40 mm openings at the supports (TII) and centre were (TIII) were 49.48 kN and 63.28 kN respectively, representing 28% increase in the ultimate load when opening is moved from support to the centre of the beam. Also there is 45% increase in the average actual ultimate load for the experimental beams with 50 mm, when the opening is moved from supports (TIV) to the centre (TV). The average actual ultimate load for the control beams (TI) was 63.88 kN, while the estimated ultimate loads for control and the experimental beams was 70.13 kN, which shows that the estimated ultimate load is about 10% higher than the actual ultimate load. The openings placed at the supports of beams have more strength reducing effect on the ultimate load, when compared with the openings placed at the centre of the beams.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Large Openings on Bending Strength of Reinforced Concrete Beam

Olanitori

Otuaga²,

Oso³

2022

JERR

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Comparative Cost Analysis of Reinforced Concrete and Timber Floor System for Effective Low Housing Scheme

Oyedepo

Olanitori

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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In Nigeria, housing is grossly inadequate especially in urban area due to migration from rural area to urban area which results in poor environmental quality. In this paper, the cost analysis of 6 m x 6 m square suspended floor, constructed with reinforced concrete and wooden floor for housing units was carried out. The results show that wooden floor system is 21.6% cheaper than using reinforced concrete in construction. The use of timber in building construction should be encourage, as it will minimize the dead load and reduces the cost of building construction that will be sustainable and affordable for the low income earners.

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Strengthening Reinforced Concrete Beams with Vertical Perforations by using Steel-Plate Tubing

Shneet,

Izzet

2024

Eng. Technol. Appl. Sci. Res.

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This study aimed to experimentally compare the bending behavior of reinforced concrete beams in the midspan zone of the maximum bending region with and without vertically perforated openings. Five rectangular cross-section beams were produced for this purpose: one solid specimen, one with an opening without reinforcing steel, and the remaining three had openings reinforced with steel tubes of thickness 1, 1.5, and 2 mm. The square opening width was 40 mm. All specimens were tested under a symmetric four-point loading until failure. The test results showed that all specimens failed in bending. The presence of an opening negatively affects the ultimate load-bearing capacity and bending. However, the bending behavior of the reinforced concrete beams exhibited superior performance as the thickness of the steel tube increased. Additionally, the maximum load-bearing capacity increased with increasing tube thickness.

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Effect of small transverse service holes on shear strength of reinforced concrete slender beams

Cited by 3 publications

References 12 publications

Effect of Large Openings on Bending Strength of Reinforced Concrete Beam

Effect of Large Openings on Bending Strength of Reinforced Concrete Beam

Comparative Cost Analysis of Reinforced Concrete and Timber Floor System for Effective Low Housing Scheme

Strengthening Reinforced Concrete Beams with Vertical Perforations by using Steel-Plate Tubing

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