Eventos Anais de eventos
MECSOL 2019
7th International Symposium on Solid Mechanics
Discrete optimization of semi-rigid steel frames in second-order analysis
Submission Author:
Marcos Henrique Bossardi Borges , RS
Co-Authors:
Marcos Henrique Bossardi Borges, Adelano Esposito, Herbert Gomes
Presenter: Marcos Henrique Bossardi Borges
doi://10.26678/ABCM.MECSOL2019.MSL19-0110
Abstract
Traditionally, analysis and design of steel structures consist on simplifying assumptions that connections behave as ideally rigid or pinned. However, these simplifications alter significantly frame behavior, as in the case of beam-to-column connections that, by introducing local effects and imperfections, tend to modify transmitted bending moments and rotations. In this context, the study of a semi-rigid approach is relevant to more realistic modeling and a more economic design. As follows, the present work seeks identification and evaluation of influences from application of semi-rigid joints in first- and second-order analysis on optimal designs of selected structures. To do so, a discrete Particle Swarm Optimization algorithm is implemented, considering in linear and geometric nonlinear analysis the beam-to-column connection semi-rigid effects of four different joint types, following AISC-LRFD specification on structural sizing of steel-framed buildings. Based on analyzed examples, the results obtained demonstrate a distinguished change in structural strength, mainly when semi-rigid connections are assessed in second-order analysis, resulting in significantly stiffer optimal solutions.
Keywords
discrete optimization, geometric nonlinearity, semi-rigid connections, metaheuristic algorithm
