ABSTRACT
ABSTRACT: The required safety for bridge erection conditions is often not specified in codes and standards, but is chosen by the contractor’s engineer to suit special conditions. This paper illustrates choice of safety levels by optimization, considering consequence costs and uncertainties, and the sensitivity of the optimum safety levels to the various parameters that have to be estimated. The required optimum safety levels are surprisingly high compared with normal code values due to the typical situations in which erection equipment and demands on the structure are often very inexpensive compared with the costs of consequences of failure of the permanent works.
