T頭錨定鋼筋拉拔試驗研究

Experimental Anchorage Performance of T-Headed Bars

蔡竺真(Chu-Chen Tsai)

指導教授 ： 林至聰教授

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2013年)

https://doi.org/10.6841/NTUT.2013.00752

摘要

鋼筋混凝土(Reinforced Concrete、簡稱RC)具備耐久性高、成本低、造型方便易維護之特性，為國內應用最為普及之建築材料，在傳統施工中採用標準彎鉤錨定，使得梁構件與柱構件交會區為結構中最密集且複雜的區域，導致交會區鋼筋施工困難與混凝土澆置品質不良，而引起交會區結構安全之疑慮，由實驗探討研究，使用機械式錨定縮短伸展長度，同時具備與標準彎鉤之規範規定，效能將有助於舒緩接頭處擁塞之問題。
本研究利用T頭錨定鋼筋，改善傳統彎鉤鋼筋應用於交會區所產生結構堪慮、施工性差、品質不良等問題。利用實驗探討研究T頭錨定鋼筋之行為及參考其他專家的研究與應用成果，提昇台灣對於鋼筋材料效能(規格、配方、驗證、性能)與混凝土材料效能(規格、配比設計、驗證、性能)之應用。本研究採用T頭錨定鋼筋拉拔試驗，探討鋼筋之拉拔行為，研究共設計三十六組拉拔試體，包括 T頭錨定、鋼筋號數、埋置深度與混凝土強度為實驗之變數。實驗項目： T頭錨定鋼筋拉拔試驗、鋼筋抗拉試驗、混凝土圓柱試體抗壓試驗、混凝土劈裂試驗，試體破壞模式探討與比較，利用各變數間關係進行項目交差比對，達到實驗之目的與提昇效能，試驗結果顯示， T頭錨定鋼筋確實比標準彎鉤所提供較佳的錨定功效，錨定強度越明顯，本研究中 #5 & #8鋼筋呈現明顯之差異結果與埋置深度深淺相符，唯仍需更多實驗證明使用區間範圍，混凝土強度部份，研究顯示混凝土強度與錨定強度成正比。

關鍵字

錨定 ； 錨定T頭 ； 鋼筋拉拔試驗

並列摘要

Reinforced concrete, generally adopted by its durability, low cost and the easiness for installation and maintenance, is the most popular material of choice for construction in Taiwan. Traditionally, the standard hook used for reinforcement's anchorage results in steel congestion in the beam-column joint region, and makes the difficulty to the concrete pouring. Moreover, the poor concrete placement due to congestion sometimes degrades the quality of structures and provokes the safety-relation problem. In the last decades, T-headed bar is proposed to replace conventional standard hook to ease fabrication and construction, to improve concrete placement quality and thus reduce structural failure. Consequently, the use of mechanical anchorage to offer a potential solution for these problems, and even provide a better seismic performance is the main subject of this study.
A total of 36 specimens were designed to test under pullout condition by varying the rebar size, bonded depth, and the compressive strength of concrete. Experiment results indicate that the the T-headed bar had a better pullout strenth compared to the rebar embedded alone. The T-headed bar specimens were tested the concrete cone with the height of bonded depth while the rebar specimens tested the debonding with 20mm – 40mm concrete cone combination. The experiment also indicates a positive correlation between reinforced concrete strength and pullout strength. Finally, it is our humble that the results from this study, together with other investigation will provide some help to improve, here in Taiwan, the reinforced concrete engineering in practice.

並列關鍵字

Reinforcement anchorage ； T-Headed Bars ； Experimental Anchorage Performance

參考文獻

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