PERFORMANCE STUDY OF CONCRETE-FILLED STEEL TUBES

Concrete-filled steel tubes circular section columns are increasingly used in the design of modern multi-stories structures. Investigations developed in recent decades confirm their beneficial use. They are used as a structural component system, given their excellent energy absorption and dissipation, or as a rehabilitation tool for recovery of damaged components after a seismic event. They contribute through their performance to confer high strength to elements, as high ductility and high rigidity, with a remarkable optimization of the used materials. The main objective of this work is to review the principal models characterizing the behavior laws of concrete confined by steel jacket. An analysis based on Samantha model was conducted to highlight the parameters affecting the sectional behavior, and to evaluate the gains in strength and deformation. A section strength capacity investigation is presented. Results are compared with some codes recommendations. This type of structure can be used in Algeria for rehabilitating old buildings, or strengthening reinforced concrete columns to improve their structural performance. However, new regulatory measures should be considered in order to introduce this compound element in the construction.