Abstract
This report overviews the seismic damages of cranes. The Great East Japan Earthquake on March 11, 2011 had hit many industrial facilities. The causes of damage of cranes are splitted up into two groups: the damage by earthquake response and the damage by a tsunami. In the case of earthquake response, many overhead traveling cranes were damaged. Especially, elongation and breaking of the volts, which fasten a run rail to its support, were observed. In addition, the damage was seen in the run rail base structure of container crane. Furthermore, the wheel of the overhead travelling cranes and the gantry cranes came off its axle. In the case of tsunami, the damage of unloaders and container cranes happened. The great east Japan earthquake investigation/proposal subcommittee stated in JSME, and investigation of the damage situation has been carried out. In addition, Japan Crane Association investigated the damage of cranes, and the situation has been clarified. In this report, the damage patterns, problems of cranes and improvement points are shown based on knowledge that was provided from damage investigation.
