Banca de DEFESA: Rodrigo Vieira Fonseca

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Rodrigo Vieira Fonseca
DATE: 15/12/2020
TIME: 10:00
LOCAL: Videoconferência
TITLE:

Software for automatic model updating of tridimensional frame element structures by their natural frequencies

KEY WORDS:

Model Updating, Finite element method, tridimensional frame elements, Steel structures, Sensitivity analyses

PAGES: 40
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Mecânica das Estruturas
SUMMARY:

The demand for more accurate numerical simulations has grown in the same order as buildings become increasingly slender and flexible. In this scenario, software based on solving mathematical methods are increasingly used. These software’s allows to obtain structures responses in front of a great variety of actions and, being the finite element method (FEM) the most used. There is a difficulty in correctly simulating some parameters, as boundary conditions and specific characteristics of materials. These parameters generate differences in stiffness between numerical model and the actual structure. To get around these differences, there are model updating methods, which consists of changing structural parameters in certain points of the model, resulting in a response that physical characteristics of the actual structure and the model are very close. However, when the process is done manually, it depends on the analyst's experience, and being very time consuming, making it unfeasible in some models. In this context, this paper presents the development of a complementary software to the FEM, which performs automatic model updating, based on a sensitive analysis. After development, the software was tested by performing calibration of metal beams and a metal tower, whose modal parameters were extracted by experimental tests. Calibration was done by automatic and iterative changes in unknown parameters of the structures. By the difference in measured and numeric natural frequency’s, lower residue values were obtained. For selecting optimal results, lower residues where selected when measured and numerical modes of vibrations where paired. Computational cost and runtime were considered acceptable. Beyond that, it was possible to find values of the unknown parameters that generated small residuals.

BANKING MEMBERS:
Presidente - CLAUDIO JOSE MARTINS
Interna - RENATA GOMES LANNA DA SILVA
Externo à Instituição - VINÍCIUS NICCHIO ALVES