Análise de um sistema de lajes mistas considerando a influência do atrito dos apoios e a avaliação do momento de inércia efetivo

AUTOR(ES)

Rodrigo Sernizon Costa

DATA DE PUBLICAÇÃO

2009

RESUMO

The aim of this work is to evaluate the behavior and strength of composite slabs considering a rigorous analysis for determination of composite slabs effective moment of inertia (Ilm) and the influence of the friction of the region of the supports. The results of a program of laboratory tests, carried through by RODRIGUES &LAVALL (2005), considering the Steel Deck-60, that consists of trapezoidal profile with embossments in ¡°V¡± shape, were used tests on a series of twelve composite slab models, simply supported, submitted to bending were carried out. Different thicknesses of the steel deck, heights of composite slabs and shear spans were employed in the manufacturing of the models, according to the EN 1994-1-1:2004. During the tests deflections, end slips and strains of the steel decks were measured, allowing the analysis of the behavior of the composite slab system and the determination of its failure mode. The experimental researches had shown that the effective moments of inertia recommended by the international design specifications does not represent adequately the behavior of the composite slabs, leading to unconservative estimates of the actual deflection, mainly when submitted to the ultimate loads. Thus, in this work, proposals for the determination of the composite slabs effective moment of inertia, that adequately represents the behavior during all loading stages, will be presented. The influence of the friction of the region of the supports in the longitudinal shear bond was evaluated through the partial shear connection method, using the friction coefficient recommended by EN 1994-1-1:2004. According several examples analyzed, it is possible to affirm that: the proposals presented for Ilm calculation give a better representation slabs rigidity; the friction.s influence of the friction in the longitudinal shear bond is significant, mainly, in composite slabs with small shear span length.

ASSUNTO(S)

engenharia de estruturas teses. momentos de inercia teses. lajes teses. lajes de concreto teses.

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