Hybrid-mixed stress formulation using continuum damage models

摘要

This paper reports on the non-linear static analysis of 2D concrete structures using an hybrid-mixed stress formulation and continuum damage mechanics. The finite element model adopted is based on the direct and independent approximation of three fields: the effective stress and displacement fields in the domain of each element and the displacement field on the static boundary. The non-linear behaviour of the material is modelled with a non-local isotropic damage model. A set of numerical examples are presented to illustrate and validate the use of such numerical technique. The performance of the model is assessed by comparison with results obtained using other numerical schemes presented in the literature and also with experimental results.