中文摘要：

2011年东日本大地震发生后,发现一些抗震加固过的建筑在地震中也遭到了损坏。以一栋位于日本仙台的加固建筑为例,通过实地考察分析总结了其遭受破坏的典型损伤特征。结构在抗震加固前,应对结构的局部损伤和整体性能有准确的把握;抗震加固时应考虑局部加固对结构整体性能的影响,避免因抗震加固造成新的薄弱部位和薄弱层,从而削弱结构的整体性能。抗震加固应从这些受损的建筑物中吸取教训,进一步改进和完善现有的抗震鉴定方法和加固措施。

英文摘要：

During the Great East Japan Earthquake, some buildings retrofitted prior to the earthquake were damaged to varying degrees. This paper studies a retrofitted building located at Tohoku University,Japan,which was damaged during the 3 ~ 11 earthquake. Based on the field investigation, the scenario and characteristics of the structural damage are analyzed, and some related experiment work is summarized. It is necessary to conduct careful investigation of local damage and evaluate the overall structural performance before seismic retrofitting of an existing building. When designing a retrofit project, the engineers should consider how the local retrofitting of structural members would improve the overall performance of structures, and avoid generating new weak components or weak stories with insufficient seismic capacity resulting from the retrofitting. Lessons should be learned from these events for improving the existing seismic assessment methods and retrofitting technologies in the future.