Banca de DEFESA: Rafael de Almeida Sobral

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Rafael de Almeida Sobral
DATE: 12/07/2023
TIME: 16:00
LOCAL: TEAMS
TITLE:

Numerical-experimental analysis of a concrete subway bridge: case study.

KEY WORDS:

bridges; monitoring; modal analysis; structural integrity; finite elements

PAGES: 97
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Estruturas de Concreto
SUMMARY:

The monitoring of structures is growing in importance due to society's demands on safety,
reliability and economic management of aging infrastructure. After the initial demand for
construction, it is natural that there is concern on the part of managers for issues related to the
monitoring, detection, estimation and prediction of damage and useful life of structures. In the
context of large Brazilian cities, which have part of their road and subway infrastructure with
many years of use, there is a need for a more detailed assessment of the integrity of large
structures, such as bridges and viaducts, which cannot be completely met only with visual
inspections. In this sense, vibration monitoring and structural modeling analyzing the dynamic
and static characteristics of the structure has become an excellent monitoring technique for
evaluating and predicting the structural integrity of large structures. Being now a mature field
of study and application, it has several benefits, such as easy implementation and a reasonable
consistency in the measured parameters. This work presents the numerical-experimental
analysis modeling of the bridge in prestressed concrete over the Vicente Pires Stream of the
Brasilia Subway System, aiming at the identification of modal parameters such as natural
frequencies and modal forms, and patterns of displacement and deformation. Impulse and
ambient vibration tests were also carried out on a full-scale slab and a high-grade system with
a low-cost vibration-based SHM wireless multinode system, based on the Arduino platform,
for identification of modal parameters in civil infrastructures and compared with a professional
accelerometer system, The same used in the monitoring of the subway bridge. The data
obtained from the proposed system in the impulse tests allowed to estimate natural frequencies
within 2%, and CAM values around 0.3 to 0.9, in relation to those estimated with the highgrade
system. However, the low-cost system was not able to produce usable data in ambient
vibration tests. It can be concluded that the experimental and numerical results showed a good
correlation and that the current conditions of the bridge are in accordance with the basic design
hypotheses.

COMMITTEE MEMBERS:
Presidente - 1550512 - RODRIGO DE MELO LAMEIRAS
Interno - 1111740 - GUILHERME SANTANA ALENCAR
Interno - 1847391 - MARCOS HONORATO DE OLIVEIRA
Externo à Instituição - MAURICIO DE PINA FERREIRA - UFPA