Strength evaluation of concrete corbels cast in a different stage from the column

Abstract

The design of a precast structural system requires joints between the structural elements, and concrete corbels are commonly used in the connection between beams and columns. Concrete corbels create an obstacle in the optimization of precast production, mainly of columns that have two or more concrete corbels in different faces. In these cases, the concrete corbels need to be manufactures in a different stage from the column, which requires attention to the interface between column and corbel, and some solution to ensure the continuity of the main tie reinforcement. For this paper, tests were conducted along with analytical and computational modeling of five concrete corbels models: one monolithic model and four where the corbels are manufactured in a different stage from the column. Results show the failure mode, the interface gap opening and the accuracy of the analytical and computational predictions. It was observed that the concrete corbels with bent main tie reinforcement displayed the largest gap-opening at the interface and that the computational modeling represented the strength of the monolithic concrete corbel better than the design code models.

Behaviour of reinforced concrete corbels strengthened by FRP composites and steel bars: a critical review

“…Typically, there are six basic ways that the structural failure of corbels is related, as shown in figure 2. These are: concrete crushed on the strut, bending, shearing at the point where the corbel meets the column, loss of the main tie reinforcement's anchorage, crushing of concrete under the bearing plate, and the horizontal load [2]. Many research studies have highlighted the behaviour and reaction of reinforced concrete corbels.…”

Effects of Fiber Type and Shape on the Shear Behavior of Reinforced Concrete Corbels without Hoop Re-bars

“…Several research studies have consisted of attempts to determine the influencing factors on the structural response of reinforced concrete corbels. An experimental and analytical program was used to determine the strength of such members under transfer and vertical forces and to explain the effects of variables on the response of concrete brackets; these variables included the shape and dimensions of the concrete brackets, the shape and proportions of the corbels, the amounts of main and shear reinforcement, and the concrete strength [3,4].…”