既存低層鉄筋コンクリート建物のIs値と倒壊の関係 : 診断基準における「せん断柱」からなる建物を対象として

抄録

Seismic performance of existing RC buildings is evaluated by computing seismic capacity index, Is, using the Standard for Seismic Evaluation of Existing Buildings. Old buildings constructed before 1971, which are mostly composed of "Shear Column" prescribed by the Standard for Seismic Evaluation, are in danger of suffering heavy damages in the event of severe earthquakes. It is deemed an important research subject from the viewpoint of life safety to study on how much value of Is is required for those buildings so that they can escape collapse. This paper is intended to do it for various model buildings consisting of a single type of "Shear Column" whose structural performance until collapse is diverse. For this purpose dynamic analyses are conducted for ground motions with a design level, and maximum and residual interstory drifts are computed. The effect of aftershocks is also examined.