INELASTIC-LARGE DISPLACEMENT ANALYSIS OF STRUCTURES WITH CONTACT CONSTRAINTS

Resumo

This work presents a numerical methodology based on inelastic-large displacement approach to simulate
the 2D nonlinear behavior of structures under contact constraints imposed by the soil/rock. Non-linearities sources
are addressed, such as: second-order effects, plasticity and contact. It is worth mentioning the adoption of a
nonlinear finite element formulation based on the explicit separation between rigid body movements and those
that cause strain (co-rotational approach). The finite element formulation also considers the nodal concentrated
plasticity in which the material nonlinear behavior is represented by an explicit constitutive relationship by using
the Strain Compatibility Method (SCM). The SCM is also applied here to define any cross-sections typology

strength under axial force and bending moment. Thus, this numerical formulation can be used to obtain the non-
linear response of problems involving structure-support interaction. The contact constraints imposed by the

soil/rock can be considered as bilateral and unilateral. In case of unilateral constraints, a penalty method is applied
in each load increment and during the iterative process. Numerical modeling of a structural circular ring under
contact constraints are presented.