日本既有钢筋混凝土建筑抗震鉴定方法

日本是个地震频发国家,其抗震设计概念发展迅速。每当建筑规范修订后要执行更严格的标准时,按照旧规范设计的既有建筑,需要通过三级抗震鉴定方法,用以发现哪部分建筑物最有可能遭受破坏。在这种筛选方法中,低等级鉴定方法简单,但结果过于保守;而高等级鉴定方法则需通过更复杂的计算分析,才能得到较为可靠的结果。介绍了三级抗震鉴定方法的具体计算过程。并以一学校建筑为工程实例,进行了第一级和第二级的抗震鉴定分析,最终算得结构基本抗震性能指数E0,然后得到结构抗震性能指标Is,与结构抗震安全指标Is0作比较,从而确定结构是否抗震安全。还简单介绍了日本常见抗震加固方法,供国内抗震加固借鉴。

Seismic evaluation of existing reinforced concrete buildings in Japan

There are frequent earthquakes in Japan,and the seismic design concept develops rapidly.When codes are revised,those existing buildings designed in accordance with old codes must be found out which part will be damaged most likely by the three-level screening procedure.The lower level procedures are simple and conservative,while the higher level procedures can obtain the more reliable results through complex analysis.How to calculate is introduced by the example of a school building.In the first level screening procedure and the second level,seismic index of structure Is derives from basic seismic index of structure E0,then accordingly compares with seismic demand index of structure Is0,finally can draw a conclusion about the seismic safety of this building.In addition,common seismic strengthen methods in Japan are proposed in order to be referred in our country.