在國內針對既存建築物的補強是非常重要,在傳統補強工法中,翼牆補強、RC剪力牆補強及擴柱補強都有很好的效果。但是有許多空間及環境受限制的建築物較不適用傳統型工法,而以鋼框架斜撐補強具有相當大的優勢。 鋼框架斜撐補強工法在國內尚未有較明確的設計方式,其中鋼框架構架及混凝土構架之間的界面細節設計是個重要的課題。因此本研究針對界面細節中,探討化學錨栓的設計,規劃出4座補強試體及1座純構架。根據實驗之結果,構架柱底面之界面剪力摩擦破壞並無出現,應改為D區域剪力破壞進行設計。由於這次實驗當中,水泥砂漿之抗壓強度控管不當,導致強度過低,四座補強試體界面水泥砂漿最終都嚴重破壞剝落,尤以角落最為嚴重,因此在往後的設計中,須注意其界面細節的設計,改善界面水泥砂漿圍束的方式,並嚴格控管水泥砂漿之強度,使鋼框架斜撐能發展出理想之強度,而達到預期的補強效果。
It is very important to retrofit exsiting RC buildings in Taiwan. There are many tranditional retrofitting methods. The use of steel braces to retrofit hospitals and high-rise buildings is even suitable. Connection between steel braces frame and existing RC building is an very important issue. The research objective is to find a practical method to design anchor bolts. From specimens with steel brace and one pure RC frame were tested. It was found that the cement paste played an important role for lateral resistance. Closely spaced spiral confinement is especially needed. Compressive strength of cement paste should also be carefully controlled. The associated failure mode of RC column is the shear failure in D region instead of the base shear friction failure of the column.