| 研究生: |
王奕程 Wang, Yi-cheng |
|---|---|
| 論文名稱: |
鋼筋混凝土梁柱複合構件於高溫中、後之行為研究─ 自充填混凝土梁之承力行為 Behavior of Reinforced Concrete Beam-Column Sub-assemblage under Elevated Temperature Test ─ Behavior of Self-Compacting Concrete Beam |
| 指導教授: |
方一匡
Fang, I-kuang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2008 |
| 畢業學年度: | 96 |
| 語文別: | 中文 |
| 論文頁數: | 135 |
| 中文關鍵詞: | 溫度 、火 、梁 、混凝土 |
| 外文關鍵詞: | Beam, Fire, Temperature, Concrete |
| 相關次數: | 點閱:53 下載:1 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
本篇論文旨在探討使用自充填混凝土(SCC)材料之梁柱複合構件中之梁在高溫中、後之承力行為。
在實驗方面,本研究製作實尺寸之梁柱複合構件試體,用以模擬一幢七層樓之二樓外柱的梁、柱及接頭複合構件,混凝土材料則採用SCC。試驗共分為高溫中、冷卻過程及高溫後三個階段,加溫則採用ISO834所建議之升溫曲線,高溫加載測試時間為3小時。於加溫結束後進行15個小時之冷卻階段,並於其後進行殘餘強度測試。本研究同時使用ANSYS軟體來模擬及分析試體內部溫度變化及變形。
本研究之主要成果如下:
1. 在高溫試驗中,試體有明顯之爆裂及剝落等現象,於加溫結束時,溫度所造成梁之最大撓度為常溫之8.5~10倍,梁末端之轉動角及水平位移分別為常溫之8.7倍及24.0倍。
2. 在冷卻過程中,梁的撓度、梁末端轉動角及水平位移於開始冷卻後約一小時左右達到最大值,分別約為10倍、9.5倍及24.3倍。
3. 在殘餘強度測試中,試體因材料強度折減所造成梁之撓度增加的程度非常明顯,在柱加載為1725 kN,於服務載重下梁之最大撓度約為測試前之1.88~2.09倍,在破壞時梁之總載重約為常溫試體的0.78倍。
The purpose of this paper is to study the behavior of the beam of self-compacting concrete (SCC) beam-column sub-assemblage under elevated temperature.
In the experiment study, the specimen of full scale beam-column sub-assemblage was built to simulate the beam, column and joint sub-assemblage of the outer column at the second floor in a seven-story building. There were three phases in the experiment work, i.e., heating period, cooling period and residual strength test after heating. The heating with elevated temperature followed the ISO 834 temperature-time curve and lasted for 3 hours. After heating, the cooling period took about 15 hours. Finally, the residual strength of the specimen was tested. In the analytical study, ANSYS software was used to analyze the variation of inner temperature of beam cross section and the deformations of the specimen.
The main results of the research are as follows:
1. Obvious explosion and spalling behavior was observed during the heating period, and after that, the deflection of beam was around 8.5 to 10 times greater than that under room temperature. Besides, the beam end rotation and displacement were 8.7 and 24.0 times greater than those under room temperature.
2. The deflection, beam end rotation and horizontal displacement of beam reached their maximum values at about an hour after the cooling period started. They were approximately 10, 9.5 and 24.3 times greater than those under room temperature.
3. In the residual strength test, the deflection of beam increase significantly due to its material strength deterioration. At the column load of 1725KN, the deflection of beam under service load increased 1.88 to 2.09 times comparing with that before the test. Moreover, the total load of beam at failure was about 0.78 times of that under room temperature.
1. European Committee,“ Eurocode2 : Design of concrete structures - Part 1-2 : General rules - Structural fire design, ”ENV 1992-1-2:1995
2. Ellingwood, B., and Shaver, J. R.,“ Effects of Fire Reinforced Concrete Members, ”Journal of the Structural Division,ASCE, Vol.106, No.ST11, November 1980, pp. 2151-2166
3. ACI Committee 216,“ Guide for Determining the Fire Endurance of Concrete Elements, ”American Concrete Institute, 1994
4. Lie, T. T., and Barbaros, C.,“ Method to Calculate the Fire Resistance of Circular Reinforced Concrete Columns,”ACI Materials Journal, Vol.88, No.1, January-February 1991, pp. 84-91
5. Noumowe, A.; Carre, H.; Daoud, A.; and Toutanji, H.,”High-Strength Self-Compacting Concrete Exposed to Fire Test,”Journal of Materials in Civil Engineering, ASCE, Vol.18, No.6, December 2006, pp.754-758
6. Persson, B.,“Fire Resistance of Self-Compacting Concrete,SCC,” Materials and Sturctures, Vol.37, November 2004, pp.575-584
7. Kosmas, K. S.,“Mechanical Characteristics of Self-Consolidating Concretes Exposed to Elevated Temperatures,”Journal of Materials in Civil Engineering, ASCE, Vol.19, No.8, August 2007, pp.648-654
8. Chan, Y. N.; Peng, G. F.; and Anson, M.,“Residual Strength and Pore Structure of High-Strength Concrete and Normal Strength Concrete after Exposure to High Temperatures,”Cement and Concrete Composites, Vol.21, 1999, pp.23-27
9. Ellingwood, B., and Lin, T. D.,“Flexure and Shear Behavior of Concrete Beams During Fires,”Journal of Structural Engineering, ASCE, Vol.117, No.2, Feburary 1991, pp.440-458
10. Nilson, A. H.“ Design of Prestressed Concrete 2/E,” Wiley, New York,1987
11. CEB-FIP,“ Design of Concrete Structure for Fire Resistance, ”Bulletin D’Information, N 145, 1982
12. 張朝輝,Ansys熱分析教程與實例解析,中國鐵道出版社,北京,2007
13. 博嘉科技,有限元分析軟件-ANSYS融會與貫通,中國水利水電出版社,北京,2002
14. 方怡中,「鋼筋混凝土梁柱複合構件承受高溫之行為研究 ─ 自充填 混凝土梁之承力行為」,碩士論文,國立成功大學土木研究所,台南,(2007)
15. 葉宗益,「鋼筋混凝土梁柱複合構件承受高溫之行為研究 ─ 普通 混凝土梁之承力行為」,碩士論文,國立成功大學土木研究所,台南,(2007)