Abstract
A Monte Carlo simulation is integrated with the mechanism method to perform risk analysis based masonry arch bridge assessment. A parametric study was carried out involving: live load dispersal angle; material bulk unit weights; backfill lateral pressure mobilisation; angle of shearing resistance; and Boussinesq's limiting live load influence value. These parameters had the biggest effect on collapse load predictions. The arch span was not considered here as a random variable because it is accurately measurable. This integrated Monte Carlo simulation is offered alongside routine assessment methods. Its principal benefit lies in its efficacy as a risk assessment tool whose users would primarily be interested in the probability of collapse under certain conditions.
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