Banca de DEFESA: CLAYTON JOSÉ GOMES SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : CLAYTON JOSÉ GOMES SILVA
DATE: 29/09/2022
TIME: 09:00
LOCAL: pos graduação engenharia civil on line
TITLE:

Use of the Factor Method and Survival Analysis to Estimate the Service Life of the Superstructure of Road Bridges and Viaducts

KEY WORDS:

Deterioration; Inspection; Bridges and viaducts; Service life

PAGES: 266
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

Highway bridges and viaducts are of vital importance for the economic development of any country, since they often allow the displacement of large vehicles, and this mode of transportation is the most used in Brazil compared to waterways and railways. Since these structures are susceptible to deterioration over time, several studies on performance evaluation, service life, and deterioration models have been developed to identify the current stability condition and facilitate decision-making for planning purposes of regular maintenance of this type of construction. In this sense, this research aims to estimate the service life of the superstructure of 98 bridges and viaducts located in the state of Pernambuco, through the application of the Factor Method and Survival Analysis techniques. The data of the set analyzed in this research were collected from the Special Engineering Structures Management System (SGO) of the National Department of Transportation Infrastructure (DNIT), considering the cycle of periodic inspections performed in 2019. For the application of both methodologies, the analyzed sample was grouped by material type: reinforced concrete and prestressed concrete. Regarding the survival analysis, grade 1 was considered as the end of service life and Akaike's criterion indicated the Weibull model as the most suitable for the superstructures of the present research. The ADT and the material of the Special Engineering Structures (SES) stood out as statistically significant differently from the length of each structure. It was also found that at 50 years of age, the reliability of the superstructure of the 98 SES, those built-in reinforced concrete and prestressed concrete was 0.52, 0.12 and 0.69, respectively. Similarly, the Factor Method also highlighted extremely worse stability and functionality conditions of the reinforced concrete superstructures when compared to those executed in prestressed concrete. The results from this method highlighted that special attention should be given to the superstructures of the SES located on highways BR-101/PE and BR-408/PE, as well as those located on BR-232/PE, BR-423/PE and BR-424/PE, since they comprise older bridges with very high ADT. Although the survival analysis presents specific characteristics in the presentation of results, this methodology provided an estimate of the service life of each SES, in addition to information regarding reliability and failure rate of the set of SES analyzed. The Factor Method provided a more objective estimate of the stability and preserving conditions of the studied SES, although it was not possible to assign weights for each factor between 1.00 and 1.20 due to the lack of information regarding the materials used, at the design and execution level. Finally, the results obtained highlight that the two methodologies are reliable and consistent, which can be used to estimate the service life of the various types of SES, even when there is limited information and irregular inspections.

 

 

 

BANKING MEMBERS:
Externa à Instituição - ELIANA CRISTINA BARRETO MONTEIRO - UPE
Externo à Instituição - FUAD CARLOS ZARZAR JUNIOR - UNICAP
Externo à Instituição - JOAO MANOEL DE FREITAS MOTA - IFPE
Externo à Instituição - JOSÉ AFONSO PEREIRA VITÓRIO - UPE
Presidente - 2994651 - TIAGO ANCELMO DE CARVALHO PIRES DE OLIVEIRA