本研究乃針對窗台結構物因短柱效應所引起之破壞而進行修復補強。修復之方式擬採用支柱重塑方式，並在重塑柱之混凝土新舊界面處以FRP包覆，以增加修復構架之韌性；並以加置開孔方鋼管斜撐之方式再進行構架之補強，以增加修復後構架之勁度、強度、以及消能能力。 在試驗部分共配置四座模擬震後損傷之鋼筋混凝土構架，包括一座原型構架，以及三座經柱重塑修復後，再加置不同開孔形式的開孔方鋼管斜撐補強構架，以反覆載重進行試驗，探討各構架修復補強後之效能，並與分析程式進行驗證比較。 本研究試驗結果顯示，修復後空構架之強度發展狀況甚佳，其強度與損傷前作比較則有些微的提昇，至於勁度則因損傷之緣故而有明顯地折減情形。另外經修復後再加置開孔方鋼管斜撐之補強構架亦有不錯之強度發展，其在韌性無明顯減低之情形下，強度及勁度有顯著之提昇。 ABSTRACT In this study, recast column method is used to retrofit RC frames damaged by short column effect. Four full-scale RC frames, including one prototype frame without bracing, three frames using different types of steel bracing to enhance strength and stiffness, were tested under cyclic loading. In addition to bracing, fiber reinforced plastic (FRP) is used to wrap the columns to enhance ductility. Experimental result shows that the ductility and strength of prototype frame wrapped by FRP sheet are improved better than that of undamaged frame, but stiffness descends explicitly because of damage. In the other hand, the other tree frames using steel bracing performance well in ductility, strength and stiffness. The force-displacement curve of each specimen was also predicted by the SAP2000 code and can match the experimental results quite well. This study demonstrates that steel bracings cut out with holes can efficiently increase both strength and stiffness without reducing ductility. One may control the size of holes to satisfy requirement. With wrapping columns by FRP sheet, the performance of frame system can be substantially increased after retrofit.
