Estudo comparativo entre edificações de pequeno porte estruturadas com perfis formados a frio e perfis laminados

Abstract

The main objective of the following work is to compare structures composed by rolled profiles and by cold formed steel profiles for the same building, emphasizing the lightness of structures composed of cold formed steel profiles and demonstrating the relief of loads transmitted to the foundations in small buildings (residential and / or commercial buildings with up to five pavements) structured with cold formed steel profiles through the structural analysis and the resizing with the use of cold formed steel profiles according to the requirements of NBR 14762 of a building previously dimensioned with the use of rolled steel profiles according to the requirements of NBR 8800. The objective of this work is also to verify the efficiency of suggestions given by pre-sizing criteria and the advantages of the revision project of NBR 6120: 1980 on the edition still in use. For the accomplishment of the work a building presented in the book Buildings of small size structured in steel, published by the Brazilian Steel Institute / Brazilian Center of Steel Construction (CBCA) was used as object of study. The sizing was made with the help of the CYPECAD software and the permanent and variable actions in the structure were estimated according to the revision project of NBR 6120. With the development of the work it was concluded that the replacement of rolled steel profiles by cold formed steel profiles leads to a reduction in the weight of the structure (quantified in this work with the value of 25.85%), causing a reduction of 42.34% in the concrete volume and 19.03% in the steel quantity used in the foundations.