Fatigue reliability of deteriorating prestressed concrete bridges due to stress corrosion cracking

Maes, MA Wei, X Dilger, WH

Ma. Maes et al., Fatigue reliability of deteriorating prestressed concrete bridges due to stress corrosion cracking, CAN J CIV E, 28(4), 2001, pp. 673-683

31

INGLESE

Article

Civil Engineering

CANADIAN JOURNAL OF CIVIL ENGINEERING

0315-1468 → ACNP

28

4

2001

673 - 683

ISI

0315-1468(200108)28:4<673:FRODPC>2.0.ZU;2-6

In this paper, an analysis framework is presented to develop a relationship between fatigue reliability in a prestressed concrete bridge and the progr ess of stress corrosion cracking (SCC) in prestressing steel. The fatigue l imit state uses a cumulative damage model for prestressing steel wires, whi ch is a function of both stress range and minimum stress. The SCC model tak es into account varying degrees of material susceptibility, stress regimes, and environmental conditions and is structured around three stages: initia tion of micro-cracking, propagation, and macro-crack instability using line ar elastic fracture mechanics. The framework is an overall time-dependent a nalysis of the safety against fatigue of a prestressed concrete bridge. It involves a stochastic analysis of the evolution of prestressing wire corros ion as a function of time and a time-dependent probabilistic analysis of th e fatigue reliability of the prestressed concrete bridge suffering a certai n degree of deterioration. The uncertainties involved in the fatigue model, the SCC model, and traffic actions are considered. The updating of uncerta inties is simplified by considering a limited number of classes representat ive of the severity of SCC exposure. The framework is applied to three dete riorating highway bridges.