Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/16227
標題: Effect of Coarse Aggregate Content on Shear Behavior of Concrete Beams
粗骨材含量對混凝土梁剪力行為之影響
作者: 黃柏皓
Huang, Po-Hao
關鍵字: Shear Behavior of Concrete Beams;混凝土梁剪力行為;Coarse Aggregate Content;Aggregate Interlock Mechanism;粗骨材含量;骨材互鎖力
出版社: 土木工程學系所
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摘要: 
Abstract
The purpose of this research is to investigate the shear behavior of concrete beams with different amount of coarse aggregate. A total of 16 beam specimens were made in this study, the compressive strength of concrete in 8 of the beams was 30 MPa, and that in the other 8 was 50 MPa. Four of the 30 MPa and 50 MPa beams were designed with shear reinforcement, and the spacing was 180 mm, while the others had no stirrup. Four coarse aggragate contents (750 kg/m3, 850 kg/m3, 950 kg/m3, and 1050 kg/m3), were used for each concrete strength. The results show that :
1. The cracking shear strength increases with coarse aggregate content in specimens with shear reinforcement.
2. In beams with low compressive strength, an increase of coarse aggregate content will enhance aggregate interlock mechanism, thus increases the ultimate shear strength. But this phenomenon is not significant in 50 MPa specimens.
3. With same variables, the shear ductility index increases with coarse aggregate content. Beams with shear reinforcement are more ductile than beams without shear reinforcement.
4. The member stiffiness of beams increases with coarse aggregate content. The increase is less significant in higher concrete strength beams.
5. Beams with higher coarse aggregate contents exhibit smaller crack widths.

摘 要
本研究主要在探討改變粗骨材含量對於混凝土梁在承受靜態載重作用下之剪力行為。試驗共製作十六支梁,分成兩種設計強度,其中四支試體為普通強度(30 MPa),無剪力筋,且粗骨材含量依序為750 kg/m3、850 kg/m3、950 kg/m3、1050 kg/m3。另外四支為普通強度,配置剪力筋。另外八支梁試體之設計部份亦相同,在有配置剪力筋、無配置剪力筋的情形下分為四種固定的粗骨材含量,但在設計強度上以高強度(50 MPa)作為區別。配置剪力筋的試體其剪力筋間距皆為180 mm。試驗之變數為抗壓強度、粗骨材含量、以及剪力筋。試驗結果可歸納如下:
1. 本文實驗結果,在相同強度時,以配置剪力筋的試體所觀測之剪力開裂強度實驗值較客觀,其趨勢較清楚,剪力開裂強度隨粗骨才用量提高而增加。
2. 在普通強度時,增加粗骨材含量使骨材互鎖力提高,造成極限剪力提升之現象較明顯。高強度試體其極限剪力強度因粗骨材增加而升高之現象較不明顯。
3. 在相同變數下,粗骨材含量高者其剪力延展性指數亦較高。有剪力筋之試體剪力延展性指數均較無剪力筋之試體高。
4. 普通強度試體的剪力位移圖中,由加載開始至極限剪力的過程中,圖形的上升段斜率因粗骨材量不同而改變之現象較明顯。粗骨材較多之試體其圖形的上升段越陡,即斜率較大。在高強度中則不明顯。
5. 相同載重下粗骨材較多有較佳之裂縫控制能力,骨材少則較差。
URI: http://hdl.handle.net/11455/16227
其他識別: U0005-1808201001590700
Appears in Collections:土木工程學系所

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