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Digital transformation of bridges inspection, monitoring and maintenance processes
Published in Hiroshi Yokota, Dan M. Frangopol, Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations, 2021
T.N. Bittencourt, M.M. Futai, A.P. da Conceição Neto, D.M. Ribeiro
Structural reliability is defined as the probability that a component or a system will adequately perform its specified purpose considering a defined period and particular conditions. Either component or system reliability can be computed. A failure of a single component or a combination of individual components may initiate the failure of the system. Let R and S be the resistance and the load effect, respectively, with the probability density functions (PDFs) fR and fS, characterizing these respective random variables. The probability that S will not exceed R, P(R > S), represents the reliability. The time-variant probability of failure PF(t) can be expressed in terms of joint PDF of the random variables R(t) and S(t), fR,S(t), as: PFt=∫0∞∫oSfR,Stdrds
Conclusions and Outlook
Published in Eva O.L. Lantsoght, Load Testing of Bridges, 2019
In the past, when load tests were used to show the traveling public that a new bridge is safe for use, safety was demonstrated by showing that a bridge can carry a given number of heavily loaded vehicles. Nowadays, our codes and guidelines express safety in terms of a probability of failure. The practice of load testing, and in particular proof load testing, still needs to make the step to move from showing that a bridge can carry a heavy load to quantifying the safety in terms of a probability of failure. For that purpose, concepts of structural reliability should be combined with the practice of load testing. Whenever an assessment of “safety” is required, this assessment should be quantified in terms of a probability offailure. By the same token, a transition from member safety to systems safety (considering the entire structure and the overall structure behavior) is needed and requires research.
Bridge life-cycle performance and cost: Analysis, prediction, optimization and decision making
Published in Túlio Nogueira Bittencourt, Dan M. Frangopol, André T. Beck, Maintenance, Monitoring, Safety, Risk and Resilience of Bridges and Bridge Networks, 2016
Dan M. Frangopol, Samantha Sabatino, You Dong
Structural reliability can be defined as the probability that a component or a system will adequately perform its specified purpose for a prescribed period of time under particular conditions (Paliou et al. 1990, Leemis 1995). Component, as well as system reliability can be computed for the investigated infrastructure considering that failure of a single component or a combination of individual components may initiate the failure of the system. For instance, if R and S represent the resistance and the load effect, respectively, the probability density functions (PDFs) fR and fS, characterizing these respective random variables may be established. The probability that S will not exceed R, P(R > S), represents the reliability. As a general case, the time-variant probability of failure pF(t) can be expressed in terms of joint PDF of the random variables R(t) and S(t), fR,S(t), as: () pF(t)=∫0∞(∫0sfR,S(t)dr)ds
Time-dependent reliability assessment of steel pipelines subjected to localized corrosion
Published in Structure and Infrastructure Engineering, 2023
The structural reliability is defined as the probability that the structure lies within the safety domain, encompassed by the limit state function(s). This paper studies the reliability of steel pipelines due to localized corrosion, which is defined as the accelerated attack of a passive metal in corrosive environment at discrete sites and thus is observed in the small local areas of a corroded pipe (Frankel & Sridhar, 2008; Kutz, 2018). Compared with uniform corrosion, localized corrosion is typically associated with quicker development and greater destructiveness (Mazumder, Salman, & Li, 2021; Zhang et al., 2019), and thus falls within the scope of this paper. In this regard, two failure modes are considered, as introduced in the following.
A critical review on methods for time-dependent structural reliability
Published in Sustainable and Resilient Infrastructure, 2023
Bohua Zhang, Weigang Wang, Yanlin Wang, Yueru Li, Chun-Qing Li
Structural reliability is a probabilistic measure of structural performance, including its safety, serviceability, functionality and indeed any performance that can be defined by a criterion usually expressed in the form of limit state function during its service life. The limit state is defined as an undesirable condition that can cause structural failure. Structural reliability is then to determine the probability of attainment of this undesirable condition, known as probability of structural failure and commonly denoted by , which is mathematically defined as follows
Stochastic configuration network for structural reliability analysis
Published in Mechanics of Advanced Materials and Structures, 2022
Shangjie Li, Xianzhen Huang, Huizhen Liu, Chengying Zhao, Jiashun Shi
Structural reliability is defined as the probability that a system will perform its functionalities in the presence of various uncertainties, which is of critical importance for ensuring the safety of engineering structures in practice. Currently, various engineering applications have paid more and more attention to reliability analysis, such as composite structures, mechanical systems and industrial robots [1–3] and so on.