The slim floor system has been used mainly due to the structural and constructive advantages of it, such as the capacity to overcome large spans with the low height of the composite floor system. There is a lack of finite element modelling researches of composite connections between the slim floor system and columns, especially with the concrete infilled steel tube columns. This paper presents the numerical approach based on the solid modelling, for the simulation of the nonlinear structural behavior of composite connection between partially encased composite beam and concrete infilled steel tube column; in this model, the composite beam represents the slim floor. The ABAQUS finite element code was used to investigate the behavior of composite connection that consists of a shear steel plate and negative reinforcement of the composite slab. In this paper, the authors discusses the procedures to the numerical model construction including finite elements and boundary conditions. Besides, the influence of stress-strain relationships for concrete and steel and the parameters that defines each model are presented and discussed, as well as the different steel to concrete interface conditions. Based on the results obtained, the effectiveness of the numerical model developed was verified against experimental results showing a good agreement response for the Moment vs. Rotation response, as well as the moment resistance of the composite connection.
A procura por sistemas construtivos mais eficientes vem crescendo gradualmente nos últimos anos no Brasil. Neste cenário está inserido o sistema misto de aço e concreto que apresenta grandes vantagens tanto estruturais como construtivas. O piso misto de pequena altura trata-se da associação entre viga mista e laje mista, cuja principal característica é o embutimento da viga na laje; tal embutimento proporciona redução da altura total do sistema laje-viga aumentando o pé-direito do pavimento. Por ser um sistema em que grande parte dos elementos é industrializado, o piso misto de pequena altura permite diversas combinações entre vigas e lajes, sempre mantendo sua principal característica que é o embutimento total ou parcial da laje na viga. Assim, tomando o piso misto de pequena altura como objeto de estudo, o presente artigo apresenta as principais características desse sistema, descreve os principais componentes, dando destaque aos componentes pré-fabricados, às técnicas inerentes ao processo construtivo, incluindo equipamentos necessários à execução e detalhes construtivos. Isto é feito para quatro configurações de piso misto de pequena altura: perfil Deltabeamâ e laje mista; perfil Deltabeamâ e laje pré-fabricada de concreto, perfil I assimétrico de aço associado a laje mista e perfil I assimétrico e laje pré-fabricada de concreto.
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