Projeto estrutural de um edíficio em estruturas de aço considerando as análises em teoria de 1ª e de 2ª ordem através do software Robot Structural Analysis

Abstract

Currently, Brazilian standards, ABNT NBR 8800 (2008), have recommended that structural analyzes should be carried out using elastic analysis in second-order theory or geometric nonlinear analysis, in which the balance of the structure analyzed in its displaced position. The objective of this work is to present the calculation and designing of a four-story residential building, structured in steel, with beams and columns in laminated profiles and the floors in composite slabs using steel deck, considering the analyzes in 1st order theory and 2nd order. To develop this work, the Robot Structural Analysis Professional software was used, which is an advanced structural analysis tool that allows linear and non-linear, geometric and material analyses, of structural models of buildings, bridges and various types of industrial structures. The structure was modeled three-dimensionally and, in the analysis, it was considered that the slab works as a rigid diaphragm in the horizontal plane. The work presented the complete designing of the columns and beams of the rigid frames, using the NBR 8800 equations. The verifications of the columns and diagonals of the lattice frames, as well as the typical secondary beam of the building, were presented using Excel spreadsheets developed throughout this work. In the end, it was observed that the maximum deflections occurring in the beams, as well as the lateral displacement of the building, remained within the normative criteria, indicating that the structural bracing system adopted, both in the transverse and longitudinal directions, was adequate and led to a safe design of the building.