System reliability evaluation of in-service cable-stayed bridges subjected to cable degradation

Lu, N, Liu, Y and Beer, M ORCID: 0000-0002-0611-0345 (2018) System reliability evaluation of in-service cable-stayed bridges subjected to cable degradation. Structure and Infrastructure Engineering, 14 (11). pp. 1-13.

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Abstract

© 2018 Informa UK Limited, trading as Taylor & Francis Group The cables in a cable-stayed bridge are critical components supporting the long-span girders and ensuring their functionality. However, cables are prone to fatigue damage and atmospheric corrosion, which directly affect the bridge safety. This study presents a framework for system reliability evaluation of in-service cable-stayed bridges subjected to cable degradation. The effect of cable strength degradation on the system reliability is demonstrated through simulation on a parallel-series system representation. Learning machines are utilised to approximate the non-linear and dynamic response functions of critical components due to cable rupture, and the system reliability is finally evaluated from the event tree established by the β-unzipping method. Both short-span and long-span cable-stayed bridges are selected as prototypes to investigate the influence of cable degradation on the system reliability. On this basis it is revealed that cable degradation can significantly influence the collapse mechanism of a cable-stayed bridge and thereby lead to a significant reduction in the system reliability. This phenomenon is associated with cable spacing, where a spare cable system seems more sensitive to cable gradation. It is demonstrated that the consideration of cable corrosion and correlation is essential for lifetime safety evaluation of in-service cable-stayed bridges.

Item Type:	Article
Uncontrolled Keywords:	Cable-stayed bridges, fatigue, cable degradation, corrosion, system reliability, failure path, collapse mechanism
Depositing User:	Symplectic Admin
Date Deposited:	08 May 2018 09:59
Last Modified:	19 Jan 2023 06:34
DOI:	10.1080/15732479.2018.1459743
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3020926