Estudo comparativo de respostas estruturais antes da cura do concreto de formas metálicas incorporadas às lajes

Abstract

Composite slabs are those in which cold formed steel sheets, fitted in each other at the edges, are used as shuttering, capable of supporting the wet concrete and construction loads, and as a positive reinforcement for the slab after concrete has hardened. There are some means of providing interlocking between the profiled steel sheet and the concretethat result in a composite behavior of the slab as a single structural element. One of the connection means of providing interlocking is the mechanichal interlock provided by local defôrmations in the steel profile called embossements. Concerning the construction market, there is a great difference between the national market, were only a few types of profiled steel sheets for use in composite slabs are available, and theinternational market, where many kinds of profiled steel sheets and manufactures are available. The use of composite slabs together with composite beams is considered as the most economical and efficient floor system in multistorey steel buildings in USA, Europe, Japan and Australia, where its use has been growing steadly over more than thepast twenty years. Knowing the factors and how they affect the behavior of composite slabs, together with a comparative study of some models, may help in developing new kinds of profiled steel sheets to be manufactured in Brazil. The aims of this dissertation are a theoretical study of the factors that affect the structural behavior of profiled steelsheets while acting as a form for the wet concrete during construction and a comparative study of three models subjected to same load conditions and safety coefficients.