- 期刊
含水平搭接組合繫筋RC柱考慮搭接長度效應之耐震性能
The seismic performance of reinforced concrete columns using horizontally lap-spliced crosstie
摘要
組合繫筋為由兩支一端為180 度彎鉤另一端為直線的J 形鋼筋搭接組合而成。本研究完成3 支大尺寸鋼筋混凝土柱試體之反復側向載重試驗，探討水平搭接組合繫筋在圍束柱核心混凝土之效應。研究結果顯示：(1)本研究使用之組合繫筋水平搭接長度雖不符合甲級搭接長度之要求，但是由試體之遲滯行為可看出，其圍束效果不亞於兩端為180 度彎鉤之一體繫筋，以及使用90 度-135 度彎鉤之傳統繫筋；(2)組合繫筋之應變量測的結果顯示，組合繫筋發展之強度遠高於單根鋼筋之降伏強度，應變量測結果亦顯示本研究所使用之組合繫筋可以發揮良好的圍束功能；(3)雖然本研究使用之組合繫筋的搭接長度低於甲級搭接長度，而仍然可以發揮預期的功能，但是試驗數據很有限，因此建議組合繫筋還是使用甲級搭接長度；(4)組合繫筋可以大幅改善繫筋之施工性及施工品質，但也會增加鋼筋使用量。本研究探討的個案顯示，使用組合繫筋會使每個塑性鉸區增加11.5 公斤之橫向鋼筋量，柱淨高範圍較傳統繫筋之橫向鋼筋量增加17%。
並列摘要
A lap-spliced crosstie consists of two J-shaped steel bars (rebars) that have a straight end and an end featuring a 180° hook. In this study, a lateral cyclic load test was conducted on three specimens of large-sized reinforced concrete (RC) columns to investigate the seismic resistance capability of RC columns comprising horizontally lap-spliced crossties with less than Class A splice length. The research results are presented as follows: (a) The confinement effect of horizontally lap-spliced crosstie with less than Class A splice length, was comparable to that of the specimens using crossties featuring a 180° hook on the two ends and conventional crossties. (b) According to the reading data of strain, the horizontally lap-spliced crosstie can develop the required strength and provide satisfactory confinement effect. (c) In order to be safe and conservative, Class A splice (1.0 times the development length) for lap-spliced crossties is recommended. (d) Using lap-spliced crossties in construction is easy and produces a low possibility of construction errors. Therefore, the construction quality of RC column reinforcement and the seismic resistance capability of RC structures can be substantially increased. The case discussed in this study shows that the use of lap-spliced crosstie would increase the amount of transverse steel in each plastic hinge by 11.5 kg and in the clearance height of columns by 17%.
延伸閱讀
- 李台光、陳正誠（2021）。非定值軸力作用下含組合繫筋RC柱之耐震性能。結構工程，36(2)，51-72。https://doi.org/10.6849/SE.202106_36(2).0002
- 陳柏諺（2015）。New RC梁高拉力箍筋型式對耐震行為影響〔碩士論文，國立中央大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0031-0412201512085295
- 林克強、邱建國、紀凱甯（2016）。使用擴頭鋼筋之外柱樑柱接合耐震性能。結構工程，31(2)，25-53。https://doi.org/10.6849/SE.201606_31(2).0002
- 林保均、王孔君、游宜哲、魏志毓、吳安傑、蔡青宜、林志翰、陳家乾、蔡克銓（2014）。槽接式與薄型挫屈束制支撐構架耐震設計與擬動態試驗。結構工程，29(1)，63-85。https://doi.org/10.6849/SE.201403_29(1).0004
- 歐昱辰、蔡東均（2018）。DESIGN OF HIGH-STRENGTH REINFORCED CONCRETE COLUMNS。中國土木水利工程學刊，30(3)，223-229。https://doi.org/10.6652/JoCICHE.201809_30(3).0006