Abstract
Road bridges are exposed to stochastic traffic loadings that are not simply determined. The international codes for the design and assessment of highway bridges provide some standard trucks that can be used in the design process. Knowing that the traffic can vary considerably from one bridge to another, standard trucks may lead to poorly estimate the reliability in the assessment process. So, the sensitivity of the reliability indices to the load models will be discussed, on one hand by considering the standard truck given by the French Fascicule 61 and on the other hand by adopting real vehicle data from existing weigh-in-motion station. A set of reinforced concrete bridges will be used for the application.
Highlights
Due to the high variability of parameters related to civil infrastructures, such as material, geometrical or loading uncertainties, the reliability theory constitutes the best assessment method for this kind of structures
For example a standard truck load has been used in several studies with variable positions and combinations in the transverse direction [3],[4], in the longitudinal direction, the influence line analysis has been used to calculate the worst load effect
Two load cases will be considered, the first one is based on the standard truck Bc defined by the French Fascicule 61[5] and the second one is based on realistic data for vehicle loads from a weigh-in-motion station located on Switzerland A1 highway[6]
Summary
Due to the high variability of parameters related to civil infrastructures, such as material, geometrical or loading uncertainties, the reliability theory constitutes the best assessment method for this kind of structures. This theory, initially applied in the field of software assessment, is transmitted to the field of structural engineering[1]. The importance of choosing the right traffic model will be proved For this purpose, two load cases will be considered, the first one is based on the standard truck Bc defined by the French Fascicule 61[5] and the second one is based on realistic data for vehicle loads from a weigh-in-motion station located on Switzerland A1 highway[6]. The number of the T-shaped main girders G is 4, 5 or 6
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