台灣地區建築物往往因地震、腐蝕、自然損壞，或當初設計不敷現代需求，導致耐震能力不足，卻因經濟性、時效性或保留價值等因素無法進行敲除重建時，則須採用各項補強措施以延長其使用壽命。本研究擬採用玻璃纖維管材料，以斜撐方式對結構物進行補強。在試驗部分共配置四座鋼筋混凝土構架，包括一座原型構架，兩座以玻璃纖維斜撐補強為主之構架，以及一座採用鋼斜撐補強之構架，以反復載重進行試驗，探討各構架補強後提昇之效能，並與分析程式進行驗證比較，文末並對玻璃纖維斜撐形式補強提出結論及建議。 本研究試驗結果顯示採用玻璃纖維斜撐之構架強度發展狀況與韌性較採用鋼斜撐之構架為佳，採用鋼斜撐之構架則於局部發生破壞，分析結果亦顯示採用鋼斜撐極限強度雖高，但強度衰減最快。若針對抗剪能力不足之構架，配合使用碳纖維包覆補強則可大幅提昇其強度與韌性，則不失為一良好補強方法。 The buildings in Taiwan are often lack of seismic resistance capacity due to damage by earthquake, corrosion, and natural disaster or designed based on the concept that may not fit requirements according to the current design code. However, these buildings cannot be dismantled and rebuilt due to constraints like construction budget, under intensively operation, value of reserve, and so on. Therefore, it will be more cost effective if we can increase its load carrying capacity and extend its service life through some retrofitting technologies. In this thesis, the feasibility and performance of using GFRP braces to retrofit RC frame is investigated through experiments. Four full-scale RC frames, including one prototype frame without bracing, two frames using GFRP tube-type braces with or without filling cement, and one frame using steel braces, were tested under cyclic loading. Test results show that the development of strength and ductility of frame using GFRP braces is better than that using steel braces. Local shear-off damage was occurred at the site of concrete floor beam where two steel braces are jointed. This stress concentration effect cause the suddenly drop of resistance force from the steel brace, even though theoretically it can provide the highest ultimate load. The force-displacement curve of each specimen predicted by the RUAUMOKO code can match the experimental results quite well. It is believed that the strength and ductility of the retrofitted frame system can be substantially increase, if the columns can be wrapped by FRP sheet and all the connectors and weak links of the system can be well strengthened. This research demonstrates that the GFRP tube brace has the potential to develop an effective retrofit method for RC frame with low shear capacity.
