Computational study of concrete-filled steel tube columns produced with aggregates from construction and demolition waste

Abstract

The use of concrete-filled steel tube columns – CFSTC had begun about 70 years ago and, until today, these elements have been widely used worldwide. The behavior of the steel-concrete system can be seen as an advantage, since it opens space for the possibility of using alternative materials in the manufacture of concrete for composite columns, once the stress triaxial state minimizes the strength reductions that can occur with the use of such alternative materials. For this reason, this work aimed to computationally analyze the behavior of composite columns of circular section filled with concrete (manufactured with aggregates of the type CDW – Construction and Demolition Waste) and subjected to centered compression. In this study, the influence of the use of CDW in short CFSTC subjected to axial compression was analyzed. In the present study, a computational model of short CFSTC was constructed. Two groups of models were analyzed. Considering the results, it was possible to affirm that the increase of strength and ductility verified in the CFSTC are very important characteristics to make possible, from the structural point of view, the use of CDW, in the production of the concretes used in concrete-filled steel tube short columns.