Fatigue-Reliability Updating Through Inspections of Steel Bridges

Fatigue-Reliability Updating Through Inspections of Steel Bridges - Printable Version

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Fatigue-Reliability Updating Through Inspections of Steel Bridges - asim99 - 03-18-2013

A reliability-based fatigue-damage-evaluation procedure developed
in the companion paper is extended in this paper to incorporate information from
nondestructive inspections (NDI). Since inspections are required at regular intervals,
the results from these inspections can be used for fatigue maintenance of steel
bridges. The sensitivity and capability of some of the inspection methods, including
ultrasonic inspection, are investigated. Inspection information is beneficial; however,
it adds uncertainty to the fatigue-evaluation process. The detectability and
the accuracy are the two additional sources of uncertainty in the NDI. The uncertainties
in them are quantified. The detection events are classified into three cases,
no crack detection, crack detection but without size measurement, and crack detection
with the crack-size measurement. Using the information from k inspections,
the distributions of the basic random variables and the corresponding reliability
index are updated. Using the information on the updated reliability index, a decision
can be made on what to do next, in terms of reducing the next scheduled inspection
interval, or whether to repair, replace, or do nothing. The procedure is explained
with the help of an example. It is concluded that the inspection results can be used
to maintain the fatigue-damage integrity of steel bridges. Fatigue damage-control
curves are also proposed for everyday use

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