ANÁLISE DE CUSTO-BENEFÍCIO DA UTILIZAÇÃO DE PILARES MISTOS CIRCULARES PREENCHIDOS DE CONCRETO E AÇO

Abstract

The use of mixed steel-concrete structures can provide many structural and economic advantages for a work. Among these, the use of the mixed filled pillar stands out, which is a very viable alternative in large works due to the confinement of the concrete inside the metallic structure (which serves as a formwork) to generate an increase of resistance in these pillars. In order to implement this constructive model, it is necessary to carry out a feasibility study, that is, to seek the best relationship between the mechanical strength of the column and its cost. In this way, this work deals with the cost-benefit analysis of the use of mixed circular pillars filled with concrete and steel. For the structural analysis, the finite element method was used using the educational software Ansys. A relation between the cost of the column and its final load is obtained, varying three parameters: thickness of the metallic tubular profile, resistance to the compression of the concrete and the yield stress of the steel. Among the columns analyzed, the one with the best cost-benefit ratio was the C58-A343-T2.65, that is, a column with 58.68 MPa of compressive strength, 342.95 MPa of yield strength and metal pipe thickness. 2.65 mm, with a value of R $ 0.135 / kN. The economic analysis indicated a higher cost-benefit ratio when using concrete with greater strength and occupying the largest possible area of ​​the cross section in relation to steel.