Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Influence of the Location of Forces Application in the Nonlinear Analysis of I-Girders Submitted to Bending
Submission Author:
Caroline Martins Calisto , MG
Co-Authors:
Caroline Martins Calisto, Elvys Reis, Ana Lydia Castro e Silva, hermes carvalho
Presenter: Caroline Martins Calisto
doi://10.26678/ABCM.COBEM2019.COB2019-2298
Abstract
This paper discusses the behavior of supported steel beams with I cross-section, which are able to move laterally with free warping and restrained twist in the both ends, defined as the lateral torsional buckling (LTB). It was applied a distributed load subjected the beam to a pure bending, and the model considered the residual stresses, geometric nonlinearity and elastic-plastic behavior of the material. The cases where loads act on the upper and lower lines of the web, as well as the halfway, were evaluated under the light of ABNT NBR 8800:2008. Numerical models with nonlinear analyses were developed in Abaqus software, in order to detect the occurrence of the stabilizing effect and the sensitivity of the load discretization in the results of elastic critical moment and moment resistant to LTB. As expected, the results obtained for load acting on the halfway of the web for elastic critical moment converged to the normative value of ABNT NBR 8800:2008. Moreover, the result in relation to load discretization converged for the analytical result as the number of discrete loads were increased. In other words, it can be said that more discretization led to a good representation of the distributed load in the profile.
Keywords
lateral torsional buckling, Stabilizing effect, Numerical Modeling, nonlinear analysis
