Eventos Anais de eventos
MECSOL 2019
7th International Symposium on Solid Mechanics
Truss optimization including the effects of geometric nonlinearity in structural analysis
Submission Author:
Júlia Elisa Citon , RS
Co-Authors:
Júlia Elisa Citon, Adelano Esposito, Herbert Gomes
Presenter: Marcos Henrique Bossardi Borges
doi://10.26678/ABCM.MECSOL2019.MSL19-0143
Abstract
The consideration of nonlinearities is extremely relevant in the structural analysis of trusses, since the optimization of the structure requires cautious analysis regarding the effects of buckling. Therefore, this study investigates the perturbations in the topology of the objective function due to nonlinearities, potentializing the use of heuristic methods, being one of them the PSO, used in this work. An algorithm was developed to predict global stability by detecting singularities of the global stiffness matrix to overcome the difficulties of load control method. The largest deflections in the structures analyzed in relation to the linear analysis were replicated to the objective function of the optimization problem, causing fluctuations and the formation of local minima. The stability criterion adopted allowed the satisfactory use of the line control method to the optimization problems, making feasible the analysis of the highly nonlinear behavior of the structures.
Keywords
truss optimization, structural analysis, geometrical nonlinearity, finite elements method, PSO
