Japanese seismic screening method for seismic safety evaluation of existing reinforced concrete buildings


In this method, safety level of an existing building is evaluated by the seismic index IS, which is expressed by the equation, IS = E0SDT, where E0 is the basic seismic index, SD is the penalty for the irregularity of a building (<1.0), and T is the penalty for aging effect (0.7-1.0). The principle of this method is to evaluate the seismic capacity of a building based on strength and ductility of vertical members such as columns and walls. For example, the basic seismic index E0 is calculated as follows using the strength index C and the ductility index F of each element.
















Seismic safety of a building shall be judged by comparing the seismic index Is with the seismic demand index Is0, which is expressed by the equation, Is0 = EsZGU, where Es is the basic seismic demand index, Z is the zone index (0.7-1.0), G is the ground index, and U is the usage index. The value of the basic seismic demand index Es is 0.8 for the first level screening and 0.6 for the second and third screening. For example, in a case of a residential building in Tokyo on stiff ground, Is0 will be 0.6. The seismic demand index Is0 may change depending on the seismic environment of each country.





See Reference 1).


See Reference 1).


1)      “Standard for Seismic Evaluation of Existing Reinforced Concrete Buildings, 2001”, The Japan Building Disaster Prevention Association, 2004.12