<b>Mechanical analysis of a shear-cracked RC beam

Abstract

Shear crack analysis is essential for engineers to estimate repair work in concrete structures. So far, conventional theoretical and numerical analyses in fracture mechanics have been applied to study concrete flexural beams, but there is still little knowledge regarding the shear capacity for beams with a diagonal initial notch. In this study, a theoretical analysis is presented to obtain fracture resistance in a fourpoint RC beam with two inclined initial notch on supports. Here, a fictitious crack approach is adopted for estimating the equivalent effect of the fracture process zone of concrete in shear-cracked. Based on equilibrium equation in the beam notch cross section, shear force was expressed in terms of fracture process zone length. Then, in a double notch four-point beam, Mode II of the stress intensity factor due to the external load is determined. Finally, this process presents the relationship between the shear capacity and the fracture process zone length and expresses the fracture resistance as a function of fracture process zone length.The predicted results of loading capacities are then shown.

Numerical simulation of shear-strengthening of reinforced concrete beams by CFRP under cyclic loading

“…This zone is known as the fracture process zone (FPZ). The FPZ is able to transfer normal and shear stress (Shahbazpanahi, 2017). One of the most conventional interface elements to simulate the FPZ is the discrete cohesive element (Xie & Biggers, 2006).…”

Fracture toughness of RC beams on the shear, strengthening by FRCM system

“…There are interest for using different polymer plates for shear strengthening of RC beams by many researchers [3,4]. There are some works with different computer modeling of shear crack [5].…”