016年02月06日所發生的高雄美濃地震，造成臺南市許多鋼筋混凝土(RC)建築之損毀，從眾多損毀之建築中可發現，有許多為屋齡20年、樓高七樓以上、未滿50公尺之RC建築大樓，此類大樓之柱一般採非韌性配筋細節，例如箍筋配置量不足，造成混凝土圍束不佳，以及剪力強度偏低等問題，另外，此類大樓低樓層柱的軸力皆不小，由於前述非韌性的設計以及較高的軸力，使得此類大樓柱呈現受壓崩潰式破壞，造成其所在樓層之倒塌，常造成大量居民傷亡，因此有必要針對非韌性配筋之RC大樓柱，進行耐震行為與補強之研究。
本研究將研擬適用中高樓層RC建築柱之RC擴柱補強方法，本研究首先將蒐集屋齡約20年之中高樓層建築低樓層柱之設計資料，瞭解其材料性質、配筋細節與軸力大小，並據此設計原始未補強之柱試體；接著本研究將研擬RC擴柱補強方法，並設計補強試體。最終將進行試體雙曲率反覆側向載重試驗，以研究未補強柱之耐震行為，以及所研擬擴柱補強方法之有效性。
本研究目前已完成相關文獻之蒐集與回顧，並建立擴柱補強之試驗資料庫，根據文獻回顧之成果及屋齡約20年之中高樓層建築低樓層柱之設計資料，已完成七座大尺寸柱試體之設計與製作，施工過程已顯示所研擬之擴柱補強實務施工之可行性，柱之載重試驗目前正在進行中，目前已經完成三座試體之試驗。

The 2016 Meinong Earthquake of Kaohsiung caused severe damage to many reinforced concrete (RC) buildings. From the many damaged buildings, it can be seen that several are buildings that were built 20 years ago and have seven or more floors but are less than 50 meters in height. The columns of this type of buildings usually have non-ductile reinforcement details, such as low amounts of transverse reinforcement, which caused poor concrete confinement and insufficient shear strength. Moreover, the columns of this type of buildings are usually subject to high axial compression. Due to these reasons, the columns of several buildings of this type showed brittle collapsed during the 2016 Meinong Earthquake, leading to collapse of stories or even the entire building and causing severe casualty. Therefore, it is necessary to examine the seismic behavior and retrofit methods for the columns of this type of buildings.
This research aims to develop RC jacketing methods for retrofit of mid-rise nonductile RC building columns. This reseach will first collect the design data of the lower-story columns of real mid-rise buildings that were built around 20 years ago. The material properties, reinforcement details and amounts of axial load will be examined. Based on the design data, column specimens to represent origal columns of the buildings will be designed. Then, retrofit methods using RC jacketing will be developed and retrofitted column specimens designed. Finally, this research will conduct double-curvature cyclic tests on original columns and retrofitted columns to investigate the effectiveness of the proposed RC jacketing methods.
Literature review has been completed and a test database of columns retrofitted with reinforced concrete jacket has been established. Based on the results of the literature review and the design data of the lower-story columns of real mid-rise buildings that were built around 20 years ago, seven large-scale column specimens have been designed and constructed. The construction has verified the constructability of the proposed retrofit scheme. Testing of the column specimens is currently in progress.The three specimens had been finished the test.

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