Teses #critical temperature
Hellen Reis Mourão. Sobre o comportamento das vigas de aço, com flambagem impedida, em situação de incêndio. 2004. 0 f. Dissertação (Mestrado em Engenharia Civil) - Universidade de São Paulo, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior. Orientador: Valdir Pignatta e Silva.
Steel structures strength is reduced at high temperatures. The aim of this work is to analyze the behavior of supported and fully fixed end beams at high temperature, considering: several load levels, uniform temperature on the beam and thermal gradient through the cross section. The displacements, loads and reaction efforts in accordance to the temperature variations will be presented, taking into account the resistance decrease and the strain amplification at elevated temperatures. The analysis has been carried out by means the computer program ANSYS® v. 6, using the “beam-24” fine element. It was considered the non-linear effects of the geometry and the material of the structure, besides the stress-strain diagram in high temperature to many thermal levels. The thermal properties of the steel adopted in the structural modeling of the steel beams are given in the Brazilian Standard NBR 14323 (1999) – “Dimensionamento de estrutura de aço de edifícios em situação de incêndio” (“Steel structures design of buildings in fire conditions”).
