Material and geometric nonlinear analysis of reinforced concrete frames

Resumen

The analysis of reinforced concrete structures until failure requires the consideration of geometric and material nonlinearities. However, nonlinear analysis is much more complex and costly than linear analysis. In order to obtain a computationally efficient approach to nonlinear analysis of reinforced concrete structures, this work presents the formulation of a nonlinear plane frame element. Geometric nonlinearity is considered using the co-rotational approach and material nonlinearity is included using appropriate constitutive relations for concrete and steel. The computation of the stress resultants and the tangent constitutive matrix is carried out using the Fiber Method. The formulation and computational implementation are validated using experimental results available in the literature. Excellent results were obtained.