Abstract

This work shows the analysis of the adherence of a fiber embedded in the matrix by the Stiffness-Force method (SFM) in Finite Elements. The formulation of the SFM method takes into account not only the equilibrium equations but also the compatibility conditions, obtained from the principles of the virtual work and complementary virtual work. For the finite element analysis using the SFM method a user subroutine (UEL) of a four node axisymmetric quadrilateral element has been formulated, and has been implemented in the commercial code Abaqus. In a first step the specimen has been analyzed by Abaqus, which uses the stiffness method in its formulation. Then the same model has been analized by the user subroutine which uses the SFM method. Finally, the results obtained by both analysis have been compared with varying degrees of discretization.

Abstract

Corrosion of the steel bars is the first cause of degradation of the reinforced concrete structures. This is the reason why in recent years non-corrosive materials are using to increase the useful life of these structures. Glass fiber reinforced polymer (GFRP) bars are an alternative to traditional steel bars. These bars are manufactured from continuous glass fiber embedded in a polymeric resin by the pultrusión process. Due to the great variability in the mechanical properties provided by manufacturers, it may be useful to define a test procedure to characterize the material in a simple manner. This work shows a procedure to determine the compression, tensile and flexural moduli of a GFRP bar by means of bending tests.