Influence of concrete strength in the minimum shear reinforcement ratio of beams

Authors

  • Sergio González García Universidade Estadual do Norte Fluminense (Brasil)
  • Ibrahim Abd El Malik Shehata Universidade Federal do Rio de Janeiro (Brasil)
  • Lidia Domimgues Shehata Universidade Federal Fluminense (Brasil)

Keywords:

Beam ductility, high strength concrete, minimum shear steel ratio

Abstract

Lightly reinforced concrete beams fail in a brittle manner, due to steel fracture soon after cracking of concrete. In order to avoid such a brittle failure and provide certain ductility at failure, codes of practice give formulae for minimum longitudinal and transverse reinforcement. This reinforcement is meant to resist loads beyond the first crack load and ensure that failure occur after the formation of several small cracks, improving the ductility of the beams. These design criteria are based mainly on empirical studies, and different code formulae lead to quite different amounts of minimum reinforcement, particularly for high strength concrete beams. In this work a theoretical and experimental investigation for the determination of the minimum shear steel ratio of concrete beams with different strength, having compared the formulae of different authors and code design is presented. The experimental program included tests on fourteen beams: seven of those were made of high strength concrete while the others seven had normal strength. Most of these beams had shear reinforcement in the wide range of variation of the minimum reinforcement proposed in the literature. It is also discussed which procedure would be the more appropriate for the determination of minimum shear steel ratio.

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Author Biographies

Sergio González García, Universidade Estadual do Norte Fluminense (Brasil)

Docente Universidade Estadual do Norte Fluminense, LECIV, BRASIL

Departamento Concreto Armado y Pro-tendido y  Dimensionamiento de estructuras

Ibrahim Abd El Malik Shehata, Universidade Federal do Rio de Janeiro (Brasil)

 Universidade Federal do Rio de Janeiro, COPPE, Programa de Engenharia Civil, Cidade Universitária, BRASIL

Lidia Domimgues Shehata, Universidade Federal Fluminense (Brasil)

Universidade Federal Fluminense, Centro Tecnológico, Escola de Engenharia, Sao Domingos, BRASIL

Published

2005-08-30

How to Cite

González García, S., Abd El Malik Shehata, I., & Domimgues Shehata, L. (2005). Influence of concrete strength in the minimum shear reinforcement ratio of beams. Revista Ingeniería De Construcción, 20(2), 103–114. Retrieved from https://revistahistoria.uc.cl/index.php/ric/article/view/17021

Issue

Section

Original Research