Reliability analysis of deteriorated post-tensioned concrete bridges: The case study of Ynys-y-Gwas bridge in UK

被引:22
作者
Al-Mosawe, Doha [1 ]
Neves, Luis [1 ]
Owen, John [1 ]
机构
[1] Univ Nottingham, Sch Civil Engn, Coates Bldg,Univ Pk, Nottingham NG7 2RD, England
关键词
Bridges; Corrosion; Safety; Post-tensioned concrete; Probabilistic model; Reliability; TIME-DEPENDENT RELIABILITY; BOX-GIRDER BRIDGE; STRUCTURAL RELIABILITY; PITTING CORROSION; SAFETY; DAMAGE; MODEL;
D O I
10.1016/j.istruc.2022.04.094
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Concrete structures are exposed to aggressive environmental conditions that lead to corrosion of the embedded reinforcement and pre-stressing steel. Consequently, the safety of concrete structures may be compromised, and this requires a significant budgets to repair and maintain critical infrastructure. Prediction of structural safety can lead to significant reductions in maintenance costs by maximising the impact of investments. The aim of this paper is to establish a framework to assess the reliability of existing post-tensioned concrete bridges. A time dependent reliability analysis of an existing post-tensioned involving the assessment of Ynys-y-Gwas bridge has been presented in this study. The main cause of failure of this bridge was corrosion of tendons, making it a relevant case study to evaluate the effect of corrosion on bridge safety. Uncertainties associated with material properties, geometry, loads and corrosion parameters are taken into account. The probabilistic models of the uncertainties are combined with a non-linear finite element analysis to study the effect of tendons pitting corrosion on the post-tensioned concrete bridge. The limit state function considered is flexural strength. The Monte-Carlo simulation (MCS) method is used to compute the statistical parameters of the resisting bending moment through a MATLAB code running ABAQUS. It was found that the reliability index for the first year of bridge service life is below the minimum value acceptable for structures. The study confirmed that this bridge was a high risk structure due to its design and location. The proposed framework can be used by engineers and researchers as a tool to support decision for segmental post-tensioned (PT) bridges maintenance since they need for a regular inspection due to their risk to corrosion.
引用
收藏
页码:242 / 259
页数:18
相关论文
共 54 条
[1]   Corrosion rate monitoring in the laboratory and on-site [J].
Andrade, C ;
Alonso, C .
CONSTRUCTION AND BUILDING MATERIALS, 1996, 10 (05) :315-328
[2]  
[Anonymous], 2004, EUR 2 EUR 2 DES 1 1
[3]  
[Anonymous], 2001, JCSS Probabilistic Model Code
[4]  
Bamforth P.B., 1997, INT REV CHLORIDE ING
[5]  
Broomfield J.P., 1994, Symposium on Corrosion of Steel in Concrete, P163, DOI DOI 10.14359/4348
[6]   Effects of the axial force eccentricity on the time-variant structural reliability of aging r.c. cross-sections subjected to chloride-induced corrosion [J].
Castaldo, P. ;
Palazzo, B. ;
Mariniello, A. .
ENGINEERING STRUCTURES, 2017, 130 :261-274
[7]   Resistance model uncertainty in non-linear finite element analyses of cyclically loaded reinforced concrete systems [J].
Castaldo, Paolo ;
Gino, Diego ;
Bertagnoli, Gabriele ;
Mancini, Giuseppe .
ENGINEERING STRUCTURES, 2020, 211
[8]   Partial safety factor for resistance model uncertainties in 2D non-linear finite element analysis of reinforced concrete structures [J].
Castaldo, Paolo ;
Gino, Diego ;
Bertagnoli, Gabriele ;
Mancini, Giuseppe .
ENGINEERING STRUCTURES, 2018, 176 :746-762
[9]  
CEN E, 2002, EUR 2 BAS STRUCT DES
[10]  
Clark LA, 1983, NUMBER MONOGRAPH