| 研究生: |
張君輔 Chang, Chun-Fu |
|---|---|
| 論文名稱: |
鋼筋混凝土梁柱複合構件受高溫之行為研究─普通混凝土梁之行為 Behavior of Reinforced Concrete Beam-Column Sub-Assemblage Subjected to Elevated Temperatures – Ordinary Concrete Beams |
| 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: | 2010 |
| 畢業學年度: | 98 |
| 語文別: | 中文 |
| 論文頁數: | 202 |
| 中文關鍵詞: | 耐火性能 、梁柱複合構件 、火害 、溫度 、混凝土 |
| 外文關鍵詞: | fire resistance, beam-column sub-assemblages, fire, temperature, concrete |
| 相關次數: | 點閱:148 下載:1 |
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耐火性能為建築物結構設計的重要指標之一,鋼筋混凝土仍為現今房屋結構材料之主體。本研究旨在探討鋼筋混凝土梁柱複合構件在高溫中、後之變形與強度變化,同時使用ANSYS軟體來模擬試體內部溫度變化。本期試驗共測試3座實尺寸之梁柱複合構件試體(NC4、NC6及SCC6),本文主要針對普通混凝土NC4及NC6試體的梁進行研究,並與前期研究成果試體(NC2、NC3及NC5)對照。
在高溫測試中,因梁試體受熱膨漲及抬升,使得梁末端反力減少,因此,梁柱接頭點與P1點間的剪力會增加,負彎矩在高溫中也會增加,而P2點(正彎矩區)的彎矩則相對減少。各梁試體在升溫過程的剪力強度折減情形大於彎矩強度,此因混凝土及剪力鋼筋所提供的剪力強度有明顯折減之故。
在殘餘強度測試中,各NC試體的梁均發生撓曲破壞,除NC4試體梁的總載重達常溫總載重的2.63倍時,於P1點至梁柱接頭間發生剪力破壞,此因在高溫後鋼筋強度的回復下,正負彎矩的折減不大,但混凝土所提供的剪力強度有明顯的折減,所以剪力強度的折減情形大於彎矩強度,使得剪力破壞可能提前發生。
Fire resistance is one of the critical factors considered in design of buildings. Reinforced concrete is the primary construction material of buildings nowadays. This thesis aims at studying the behavior of beam-column sub-assemblage during preheating, heating and residual strength stages. Meanwhile, the ANSYS software is used to predict the temperature distribution of specimens. In experimental study, three full-scale beam-column sub-assemblage specimens were tested (NC4, NC6 and SCC6). This thesis is focused on the study of beam in ordinary concrete specimens, i.e., NC4 and NC6, and the results of specimens(NC2, NC3 and NC5)in previous study were used for comparisons.
In the heating phase, the thermal expansion of beam reduced the reaction at support, which led to the increase of shear force within P1 and joint and increase of negative moment at joint and decrease of positive moment at P2. The shear strength of beam reduced more significant than flexural strength, which is because of the pronounced decrease of concrete and steel strength contributed to shear strength.
In the residual strength test, all of the NC specimens except NC4 were failed in flexural mode. Specimen NC4 failed in shear at location close to load point P1 when the specimen was loaded up to 2.63 times the load at ambient condition. After the elevated temperature test, the yield strength of steel recovered, flexural strengths at positive and negative moment region did not reduced so significantly as shear strength. Therefore, shear failure could be earlier than flexural failure.
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