Numerical response of bridge cranes subjected to repeated shocks during an earthquake

摘要

During an earthquake, a bridge crane may be subjected to multiple impacts between crane wheels and rail. In order to model such phenomena, a time-history dynamic analysis with a multi-scale approach is performed. The high frequency aspect of the impacts between wheels and rails is taken into account by an explicit temporal scheme, modified to resolve impacts. An implicit temporal scheme is used for the rest of the structure. The numerical coupling between the implicit and the explicit schemes is achieved with a heterogeneous asynchronous time-integrator. In parallel with the numerical methods, impact tests between crane wheels and different rail mountings were carried out in order to determine a realistic value of the coefficient of restitution used as input for the time-history analysis.