本文將日本建築學會（ AIJ ）之「鋼筋混凝土結構終局強度設計法」應用於既有 RC 校舍之耐震改善設計，並以臺南市大成國中慎思樓為例，做具體的設計過程說明。 此校 舍經改善設計後， 破壞機構接近為「梁降伏型」，崩塌地表加速度亦由原來之 171gal，提 高到 350gal 以上。

　　　　　In order to improve the earthquake-resistancy of existing school building, in this paper, the ultimate design of RC building recommended by AIJ has been adopted to do the retrofitting design. The design detail of the procedure is illustrated by Chen-Su Building of Ta-cheng Junior High School, located in Tainan city. After the retrofitting design, the collapse acceleration of the building is higher than 350gal, and the damage mechanism changes to beam-yielding type.