Banca de QUALIFICAÇÃO: HARLEY FRANCISCO VIANA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : HARLEY FRANCISCO VIANA
DATE: 29/10/2021
TIME: 15:30
LOCAL: https://conferenciaweb.rnp.br/webconf/renata-gomes-lanna-da-silva
TITLE:

Advanced Analysis of Space Steel Frames: Formulation and Computational Implementation

KEY WORDS:

Advanced Analysis; Physical nonlinearity; Geometric nonlinearity; Corrotational Lagrangian Description; Space frame.

PAGES: 80
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Estruturas Metálicas
SUMMARY:

Civil construction is a sector that consumes a large amount of natural resources and generates a huge volume of waste. For this reason, several researches have presented solutions that aim to reduce the social, environmental and economic impacts arising from the growth of this sector. Among the stages of the construction process, the project design phase stands out as a critical phase, as it is identified as one of the main causes of failures in buildings in use and, in addition, it is where the optimization of the construction process can be made possible. Considering these aspects, a more efficient method of analysis and design of structures aimed at a better use of materials employed in the composition of structural elements is increasingly demanding nowadays. For this, the main factors that affect the behavior of structures must be included in the formulations for structural analysis, such as physical and geometric nonlinearities. The aim of this research is to present the theoretical development and computational implementation of a formulation based on the finite element method for the analysis of spatial frames considering physical and geometric nonlinearities. The theoretical development is carried out by applying an updated Lagrangian formulation, which uses the corotational approach to deduce the consistent stiffness matrix of the spatial frame finite element. The kinematic relationships adopted allow the consideration of large rigid body translations and rotations accompanied by small deformations. The plastic behavior of the material is considered by applying the concept of distributed plasticity and appropriate material constitutive relationships, which allows the monitoring of yielding along the height of the cross section and length of the element. The advantage of the presented methodology lies in the fact that it allows the simultaneous strength and stability evaluation of a structural system as a whole, in such a way that the subsequent verifications of each structural member carried out separately can be dispensed. In addition, it is possible to explicitly model residual stresses and initial geometric imperfections. The formulation will be implemented in the ASTRAS program, developed in Fortran 90 language. For the solution of nonlinear static equilibrium equations, the Newton-Raphson incremental-iterative method is used. Finally, numerical examples will be presented in order to demonstrate the consistency and accuracy of the results obtained through the proposed methodology.

 

BANKING MEMBERS:
Presidente - RENATA GOMES LANNA DA SILVA
Interno - LINEKER MAX GOULART COELHO
Externo à Instituição - ARMANDO CESAR CAMPOS LAVALL - UFMG
Externo à Instituição - RODRIGO SERNIZON COSTA - UFBA
Externo à Instituição - SAMUEL SILVA PENNA - UFMG