Banca de DEFESA: Fernando Merlim de Oliveira

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Fernando Merlim de Oliveira
DATE: 17/02/2023
TIME: 10:00
LOCAL: https://teams.microsoft.com/l/meetup-join/19%3ac7400f7226fa437ebf58e9a28acf1e9b%40thread.tacv2/16764
TITLE:

Uncertainty Quantification and Reliability Analysis of Existing Concrete Bridges Using Real and Updated Traffic Loads

KEY WORDS:

traffic load, structural reliability, bridges, uncertainty quantification

PAGES: 58
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Estruturas de Concreto
SUMMARY:

This work proposes a method to analyze the design traffic load used in concrete bridges comparing it to real traffic based on uncertainty quantification and reliability structural. As a case study, the Brazilian and American design vehicles are used, and for such, it was considered the verification of the structural safety through the reliability index β. The analyses were applied to bridges with spans of 20, 30, and 40 meters, and the ultimate bending moments were studied. To represent the real traffic, a known database of vehicles was admitted, which makes use of the identification of heavy trucks according to the National Department of Transportation Infrastructure (DNIT), assuming that the bending moments induced by these vehicles follow the same probability density function of the respective weights. In addition to the analysis at time T=0 when the weighing was taken, verifications were also exposed for the extrapolated vehicle weights for a return period (T) of 15, 50, and 75 years. An extrapolation methodology and Monte Carlo simulations were used to obtain the extrapolated vehicle weights and the bending moments. The results indicate that the reliability indexes obtained are lower than the minimum required by international codes, thus encouraging better inspection practices regarding the weight of vehicles and the necessity for improvements of standards relating to traffic loads and/or bridges. Moreover, what it relates only to traffic loads, a higher percentage of the characteristic values of the live loads are exceeded in the unfavorable direction, if compared to recommended ABNT standard within the stipulated return period of 50 years

BANKING MEMBERS:
Externo à Instituição - GELSON DE SOUSA ALVES - UFPI
Presidente - 2047809 - FRANCISCO EVANGELISTA JUNIOR
Externo ao Programa - 1012696 - RAMON SALENO YURE RUBIM COSTA SILVA
Interno - 404840 - WILLIAM TAYLOR MATIAS SILVA