A study of consistent methods for reliability updating based on measurements

Two methods and three procedures for consistent incorporation of measurements into a reliability analysis is outlined. The application of the methods is in particular associated with analysis of dynamically sensitive structures. It is focused on the effect of measurements as a tool for design and construction verification. As an example, extreme dynamic response of a cable-stayed bridge during construction is considered. Vertical vibrations of the cantilever and corresponding bending moments at the pylon foot are investigated. Key parameters for the prediction of the extreme response are modelled as random variables. The probability of having a failure due to excessive dynamic response is calculated from the specified statistical properties of these random quantities. Based on the vibration measurements performed on the bridge during construction, the three procedures are used to calculate the updated probability of failure. The results of the analysis highlight the role of measurements in the contest of reliability updating. Sensitivity of the results is studied.