VANTAGENS COMPUTACIONAIS DA UTILIZAÇÃO DA MATRIZ DE RIGIDEZ DE ̃ELEMENTOS SEGMENTADOS NA ANÁLISE NÃO LINEAR DE ELEMENTOS DE CONCRETO ARMADO TIPO PÓRTICO

Resumo

A segmented element can be defined as a structural member that is composed of segments
whose properties cannot be expressed as a continuous function and vary randomly throughout the element
(e.g. modulus of elasticity, cross section, length). The present work aimed to develop the stiffness matrix
of a segmented element to compare the computational performance of this in relation to the conventional
stiffness matrix. A simply supported reinforced concrete beam was analyzed linearly and not linearly.
The non-linear analysis with stiffness degradation was based on the moment-curvature relationship of
the cross section of the beam, where the stiffness of a segment depends on the bending moment acting at
the midpoint of it. The results confirmed that it is possible to significantly reduce the time of analysis of
a reinforced concrete structure using the stiffness matrix of a segmented element. The numerical models
were able to represent the behavior of the tested beam to values above 95% of the ultimate load