Abstract
This research is devoted to investigate the effect of Carbon Fibre Reinforced Polymer (CFRP) strips on the behavior and load carrying capacity of the strengthened concrete corbels. Numerical investigation was carried out. The experimental program variables include location, direction, amount of CFRP strips, effect of shear span to effective depth (a/d) ratio on the behavior of strengthened corbels. All corbels had the same dimensions and flexural reinforcement and they were without horizontal shear steel reinforcement. ANSYS V.11.0 software was utilized in this work. Solid65, Solid45, Link8 and shell41 elements were used to model concrete, steel bearing plates, steel flexural reinforcing bars, and CFRP strips respectively. Full bond was assumed between CFRP sheets and concrete interface. The full Newton-Raphson method is used as a nonlinear solution algorithm. The displacement criteria are used for convergence. The adopted finite element analysis showed good agreement with experimental results throughout the load-deflection history, the maximum difference in the ultimate load was less by10%. However, the finite element models show a slightly stiffer response.
Highlights
Corbels are short-haunched cantilevers that project from the inner face of columns or concrete walls to support heavy concentrated loads of precast beams, gantry girders, and other precast system loads
NUMERICAL RESULTS To illustrate the validity of the proposed numerical method for the analysis of reinforced concrete corbels strengthened with Carbon Fibre Reinforced Polymer (CFRP) strips, all tested corbels were analysed by using ANSYS computer program, as mentioned previously
Based on the overall results obtained from the finite element analysis for the externally strengthened reinforced concrete corbels by CFRP strips, the following conclusions can be drawn: 1. The three-dimensional nonlinear finite element model adopted in the present research work is suitable for predicting the behaviour of the strengthened reinforced concrete corbel with CFRP sheets
Summary
Corbels are short-haunched cantilevers that project from the inner face of columns or concrete walls to support heavy concentrated loads of precast beams, gantry girders, and other precast system loads. The nonlinear stress behaviour of the short member is affected by the shear deformation in the elastic range and the shear strength of the section becomes an important parameter for design consideration (Mattock et al, 1976). Design of corbels should have a special attention, since the strength of a precast concrete structure is mainly governed by the strength of the connections rather than the members. This paper deals with the finite element analysis of reinforced concrete corbels strengthened with CFRP strips and subjected vertical loads. This research includes the analysis of corbels by using a powerful nonlinear finite element method package The accuracy of the finite element models is determined by ensuring that the ultimate load is reasonably predicted in comparison with the experimental results (Mohamad Ali and Attiya, 2012), and the load-deflection curves are close to the experimental curves as well as the crack patterns are similar to that achieved from experimental test
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