A theoretical model for the analysis of reinforced concrete sections subjected to combined axial, flexure, shear and torsion loading

摘要

A new three-dimensional theoretical model for the analysis of reinforced concrete sections under combined loads is presented. Axial (N), biaxial bending (M_x, M_y), biaxial shear (V_x, V_y) and torsion (T) loads are considered in the section analysis. The main objective of this paper is to make a proposal of a completely general 3D model capable of analysing any reinforced concrete cross-section shape subjected to any possible load combination. The 3D-Model is built as the union of two complementary sub-models: a Frame Model (1D-Model) in charge of supporting longitudinal stresses (σ) and a Panel Model (2D-Model) which considers all the shear stresses (τ) developed and the rest of the longitudinal stresses. It is also included a numerical implementation of the model based on the Finite Element Method. The main significance of this analysis is the global numerical treatment in both sub-models simplifying the interaction process.