Locating the site of diagonal tension crack initiation and path in reinforced concrete beams

Abstract

The most favorable site of diagonal tension crack initiation has been attempted to be located. Due to the numerous interacted parameters affecting both site and angle of diagonal tension crack initiation, twelve possible sites were investigated, at midheight of the shear span and at the bottom surface near the support of the beam with vertical and diagonal orientations. The first diagonal tension crack initiated from the bottom tip of the diagonal pre-crack at midheight of the beam as a result of constraint release. To verify the previous finding, a single diagonal pre-crack has been created at midheight of only one side of the shear spans in both normal and fiber reinforced concrete (FRC) beams. FRC beam showed different behavior, where couple of diagonal tension cracks initiated at both sides from the tip of flexural cracks regardless of the existence of pre-crack at one side of the beam. Ó 2014 Faculty of Engineering, Ain Shams University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).

Reinforced concrete beams with openings in fire

“…Studies show alternatives to optimize the steel consumption of reinforcement in the opening region, mitigate the concrete stresses and cracks and propose more current calculation techniques than those already established by Leonhardt and Monning (1978) [2] and Sussekind (1984) [3]. Research has been carried out, for example, by Shoeib and Sedawy (2017) [4], to understand the magnitude of mechanical damage in these beams; by El-Mar, Sherbini and Sallam (2015) [5], to analyze the region where concrete cracks begin; by Chapter 73 Sayed (2019) [6], to investigate the shear stresses along the beam; by Mansour (2021) [7], to understand the use of steel fibers in crack mitigation and stress dissipation, among others. Herrera et al (2017) [8] and Elsanadedy (2019) [9] showed that failure of RC beams with openings under normal temperature conditions predominantly occurs under excessive shear stresses.…”

Experimental evaluation of the effort of dune sand replacement levels on flexural behaviour of reinforced beam

“…So far, numerous studies have been done on ordinary concrete and its components (Sallam 2010;Sallam et al 2010;Abou El-Mal, Sherbini, and Sallam 2015;Hawileh et al 2015;Abdalla et al 2016;Abou El-Mal, Sherbini, and Sallam 2018). However, the utilization of DS in concrete would improve the mechanical properties of concrete (Zhang et al 2006).…”

“…Beam is one of the important components of the structure, so numerous studies have been carried out in previously literatures (Sallam 2010;Sallam et al 2010;Meraj, Pandey, and Rao 2014;Abou El-Mal, Sherbini, and Sallam 2015;Bhashya et al 2015;Gopinath, Murthy, and Iyer 2015;Hawileh et al 2015;Abdalla et al 2016; Evangelista and de Brito 2017; Abou El-Mal, Sherbini, and Sallam 2018; Balaji and Thirugnanam 2018; Prusty, Patro, and Mohanty 2018; Sunayana and Barai 2018). However, comparably rare research on the flexural behaviour DSC beams has been carried out.…”

Energy Equivalence Approach for Analysis of Reinforced Concrete Beams under Mixed Mode Loading

“…The shear behaviour of concrete beams depends on the development of two shear load transfer mechanisms namely, arch action and beam action. The extent of arch and beam action depends highly on the shear span to depth ratio of the beam [2]. Further studies are required to investigate the shear failure behaviour of concrete beams for various positions of loads that trigger shear cracks.…”