Shear strength of concrete block beams: Assessment of international codes and influence of shear span and longitudinal reinforcement

Pasquantonio, Rafael Dantas; Parsekian, Guilherme Aris; Soudais, P. R. N.; Camacho, Jefferson Sidney

doi:10.1201/b21889-222

Brick and Block Masonry 2016

DOI: 10.1201/b21889-222

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Shear strength of concrete block beams: Assessment of international codes and influence of shear span and longitudinal reinforcement

Rafael Dantas Pasquantonio¹,

Guilherme Aris Parsekian²,

P. R. N. Soudais³

et al.

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“…From the results, it is debatable and probably unnecessary to consider the tension in the steel reduced by 50%. These observations are also present inPasquantonio et al (2016) where results from more than a hundred tests are evaluated. If the concrete standard NBR 6118 is applied directly, two cases are accurate and the other conservatives.…”

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Concrete block structural masonry beam shear design: theoretical and experimental analysis and recommendations to the brazilian standards

Pasquantonio

Parsekian

Camacho

2019

Rev. IBRACON Estrut. Mater.

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Beams are subject a flexure and shear, with the last as the theme of this research. The purpose of this paper is to analyze specifications for the shear design of concrete block structural masonry beams, based on an extensive literature review and experimental tests here reported. From this scope, specifications for revision of Brazilian standardization are suggested. In the theoretical part, literature review from both national and international researchers were considered and the specifications of Brazilian standards, in addition to North American, Australian, Canadian and European, ABNT NBR 15961-1/2011, ABNT NBR 6118/2014TMS 402/2016, AS3700/2001, CSA S304/2014 and EuroCode6.1/2001, respectively. To analyze and validate the specifications of the literature, an experimental program was carried out assessing ten concrete block masonry beams results tested mainly to shear loads. Two-course high beams with three vertical load positions (position a/d) and two transverse reinforcement rates were tested. The specifications from the Brazilian and European standards led to considerably higher results than the experimental results, while those presented in the standards TMS 402/2016, AS3700/2001, CSA S304/2014 and NBR6118/2014 lead to results close to those obtained experimentally. As a conclusion, it can be noted that the rupture pattern is similar to that expected for reinforced concrete beams, the cracks were conditioned by the position of the loading point and by the mortar joints positions, the increase in the transverse reinforcement ratio led to an increase in the shear force. Results indicate that the consideration of apparent increase in shear strength by the ratio M ⁄ (V∙d) is not consistent. Eliminating this recommendation, considering the masonry shear strength equal to 0.35 MPa, limiting the stirrups tension to 0.90 of fyk and considering the contribution of the longitudinal reinforcement, it was possible to estimate the shear value at the rupture of each beam between 73% to 106% of the values verified in the tests.

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mentioning

confidence: 75%

Concrete block structural masonry beam shear design: theoretical and experimental analysis and recommendations to the brazilian standards

Pasquantonio

Parsekian

Camacho

2019

Rev. IBRACON Estrut. Mater.

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Shear strength of concrete block beams: Assessment of international codes and influence of shear span and longitudinal reinforcement

Cited by 1 publication

References 0 publications

Concrete block structural masonry beam shear design: theoretical and experimental analysis and recommendations to the brazilian standards

Concrete block structural masonry beam shear design: theoretical and experimental analysis and recommendations to the brazilian standards

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