GEOMETRICALLY NONLINEAR LIMIT POINT ANALYSIS OF CONCRETE STRUCTURES WITH DAMAGE AND TEMPERATURE EFFECTS
Palavras-chave:
Stability analysis, geometrical nonlinearities, damage, thermal effects, concrete structuresResumo
This work seeks to analyse a buckling and limit point problems of concrete structures based
on a geometrically nonlinear formulation with the consideration of thermal effects and material damage.
The thermal expansion effects due to heating processes in confined structures have an important role in
the stress-strain evolution. Damage is treated in a simple way through the Mazar’s continuum damage
model. The resulting equations are approached by means of a finite element discretization, the solution
of which is pursued through an incremental, iterative standard Newton-Raphson numerical scheme
implemented by the authors in an in-house nonlinear FEM code. We then present two examples of
numerical simulations to validate our formulation and illustrate its applicability to the nonlinear stability
analysis of slender concrete structures under thermal loads.
