Modelling impact action based on experiments for rock collision caused by earthquake and its application to evaluate fragility of RC wall

抄録

The objective of this study is to establish a method for evaluating the risk of damage to critical infrastructures due to the impact action of falling rocks and rockslides caused by earthquakes. First, based on the results of the existing rolling and free fall experiments on rock models, the time history of the impact force is modelled as the impact action. The characteristic values of the model were quantitatively evaluated based on the uncertainty of the impact force against the momentum of the rock at collision to the structure. Next, the response of the side wall of the critical facility in a nuclear power plant was evaluated by dynamic response analysis using the impact action model, and the fragility curve corresponding to the damage mode was evaluated using the momentum as a strength index. As a result, it is found that the fragility curve can be used to evaluate the influence based on the shape and location information of the target rock because the magnitude of the velocity that affects to the structure is determined from the size of rock.