Estudo sobre a variação da seção transversal dos pilares no dimensionamento estrutural de edifícios altos utilizando concreto de alta resistência

Abstract

The introduction of high strength concrete has been intensifying in the construction of tall buildings due to the possibility of reducing the cross sections of the pillars and consequently of the materials and labor involved in its construction. As a result, this research starts from the hypothesis that with the increase in the compressive strength of the concrete it is possible to reduce the transversal sections of the pillars besides the cost of implanting the superstructure of the building under analysis. In this way, the structural design of a 16-storey building located in the municipality of Bento Gonçalves / RS was carried out using Altober's Eberick software, varying the characteristic resistance to concrete compression, then the analysis and comparison of the data obtained through of Eberick and finally it was possible to elaborate a preliminary budget considering only costs of materials involved in the superstructure of the building, that is, concrete, steel and forms. Class C30, C60 and C90 concretes were considered. The results indicated that the cross section of the pillars reduces with the introduction of high strength concrete, in addition to reducing the quantity of materials, however, the same did not occur with the cost of materials of the superstructure, since there was an increase in the budget due to of the unit price of high strength concrete. Nevertheless, it is generally concluded that class C60 presents more satisfactory results in relation to the reduction of materials than class C90 (sic).