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Japanese seismic screening method for seismic safety evaluation of existing reinforced concrete buildings |
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INTRODUCTION |
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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.
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USAGE MANUAL |
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See Reference 1). |
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EXAMPLE |
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See Reference 1). |
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REFERENCE |
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1) “Standard for Seismic Evaluation of Existing Reinforced Concrete Buildings, 2001”, The Japan Building Disaster Prevention Association, 2004.12 |
