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OLIVEIRA FILHO, J. (2005). Theoretical and experimental analysis of cyclic loads on stiffness of the reinforced concrete beams. Ph.D. Thesis – Engineering School at São Carlos, São Paulo University, São Carlos. The main purpose of this research is to analyze the experimental and theoretical behavior of reinforced concrete beams, in order to quantify the stiffness loss, by calculating successive deflections during the cyclic loads application, under service loads. The emphasis of this research is the numerical analysis. The modeling of steelconcrete interface is done taking into account the contact between the steel bars (with their ribs) and the concrete surrounding the bars. The numerical analysis was made by using the software ABAQUS, based on the finite element method. The concrete’s constitutive model is based on the continuous damage mechanics. The experimental tests were made with cylinder concrete specimens with an axial bar and rectangular and T cross section reinforced concrete beams, where some had only tension reinforcement and others had tension and compression reinforcement. Comparisons between experimental and numerical results are presented and discussed. At the end expressions to quantify the stiffness loss due to number of cycles are proposed.

Estudo teórico-experimental da influência das cargas cíclicas na rigidez de vigas de concreto armado