# GEOMETRICALLY NONLINEAR LIMIT POINT ANALYSIS OF CONCRETE STRUCTURES WITH DAMAGE AND TEMPERATURE EFFECTS

## Palavras-chave:

Stability analysis, geometrical nonlinearities, damage, thermal effects, concrete structures## Resumo

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.