análise de pavimentos de edifícios de concreto armado com a ...

This work deals with the natural evolution of the design model based
on linear elasticity, widely employed on reinforced concrete slabs designs, to
a improved design model.
The consideration of physical nonlinearity of the reinforced concrete is
introduced into a finite element computational system by nonlayered models
with generalization of the formulation to the bending moment field. The beam
element is treated in a uniaxial field, with bending moment yielding. In the
plate element it is established the Von Mises yield criterion with associative
laws particularized to the Plane Stress. These stresses are integrated along
the element depth, enabling to write the criterion with plate bending
moments. At last, the beam and the plate models are incorporated into a
computational system, resulting in a reinforced concrete slabs analysis
system. The characterization of the cross section physical behavior is made
by a trilinear bending moment-curvature diagram.
The application of the proposed model to isolated structural elements
and to a conventional slab confirms the improvement of the finite element
system and the required computational analysis times show the feasibility of
the nonlinear model application into usual reinforced concrete slab design.
Keywords: reinforced concrete, physical nonlinearity, plasticity, slab, finite
elements.
xiv