| 研究生: |
邱柏昇 Chiu, Po-sheng |
|---|---|
| 論文名稱: |
鋼筋混凝土房屋構架在高溫中、後之行為研究─普通混凝土梁之行為 Behavior of Reinforced Concrete Building Frames Subjected to Elevated Temperature- Behavior of Ordinary 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: | 2009 |
| 畢業學年度: | 97 |
| 語文別: | 中文 |
| 論文頁數: | 172 |
| 中文關鍵詞: | 溫度 、混凝土 、鋼筋混凝土梁 、火害 |
| 外文關鍵詞: | temperature, fire damage, concrete, reinforced concrete beam |
| 相關次數: | 點閱:141 下載:1 |
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現今房屋結構物材料乃以鋼筋混凝土為主體,實尺寸梁柱複合構件之耐火測試研究資料較為少見。本研究之目的在於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。
本期研究共測試3座實尺寸試體,本文主要針對普通混凝土NC5試體進行研究,同時利用ANSYS套裝軟體來預測梁柱複合構件內部溫度之分佈及高溫中結構之變形,並與實驗值對照。
主要研究結果如下:
1.在高溫測試中試體內部溫度升到100℃左右會出現升溫遲滯之
現象,此乃混凝土內部游離水吸熱發生相變化所造成。
2.使用ANSYS套裝軟體,代入Eurocode2建議的混凝土熱性質,所
預測出來的溫度分佈與實測值大致都非常合理。
3.NC5梁進行高溫測試150分鐘後,在服務載重下,於升溫及冷卻
過程中Δ1、Δm 及Δ2的最大撓度值分別為47.4 mm、58.62
mm及65.43 mm。
4.當梁的總載重約在465 kN時,P2點附近之梁頂部出現明顯的混
凝土壓碎現象,此時Δ1、Δm及Δ2分別為63.41 mm、117.21
mm及121.24 mm,P2點斷面曲率韌性比(∅_u/∅_y)為7.83。
At present, reinforced concrete is the main building construction material. The research on the beam-column subassemblages subjected to fire is still very limited.
This experimental study aims at the behavior of beam-column subassemblages during the preheating, heating, and residual srength tests.
Three full scale beam-column sub-assemblages specimens were tested. This study is focused on the behavior of NC5 specimen made of nornal concrete. The analytical study is carried out using the ANSYS software to predict the temperature distribution in beam section and deformation of beam-column sub-assemblage under elevated temperature. The predicted and measured results were compared. The primary results are summarized as follows:
1.The temperature will be sluggish increasing as the inner temperature of the specimen reached about 100℃, which is due to the phase change of inner pore water of concrete.
2.The comparisons of predicted and measured temperature show that using ANSYS software and thermal properties of concrete suggested by EC2 can give reasonably good results.
3.Under the service load and ISO 834 thermal action for 150 minutes, the variation of maximum deflections at △1, △m and △2 for NC5 beam are 47.4 mm, 58.62 mm and 65.43 mm, respectively, during the heating and cooling stage.
4.When the total beam load reached approximately 465 kN during the residual strength test, the concrete crushed at the edge of loading plate of P2. The corresponding maximum deflections atΔ1, Δm and Δ2 were 63.41 mm, 117.21 mm and 121.24 mm, respectively. The curvature ductility of the section at P2 is 7.83 according to the measured average strains at top and bottom of the section.
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