| 研究生: |
洪敏勝 Hung, Ming-Sheng |
|---|---|
| 論文名稱: |
火害後混凝土受壓應力應變曲線
與鋼筋混凝土短梁之抗剪強度研究 Compressive Stress-Strain Curve of Fire Damaged Concrete and Shear Strength of Fire Damaged R.C Deep Beam |
| 指導教授: |
許茂雄
Sheu, Maw-Shyong |
| 學位類別: |
碩士 Master |
| 系所名稱: |
規劃與設計學院 - 建築學系 Department of Architecture |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 159 |
| 中文關鍵詞: | 殘餘抗剪強度 、殘餘應力-應變曲線 、火害 、混凝土圓柱體 、RC短梁 |
| 外文關鍵詞: | Concrete cylinder, RC short beam, fire damage, residual shear capacity, residual stress-strain curve |
| 相關次數: | 點閱:152 下載:7 |
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本文研究目的有二:第一是建立混凝土圓柱體在不同火害溫度後的殘餘抗壓強度計算公式,及其應力應變關係曲線;第二是建立火害後RC短梁之殘餘抗剪強度計算公式。
研究方法如下:
1.混凝土圓柱體尺寸為∮15cm×30cm;常溫抗壓強度29.7至50.9MPa;火害溫度為室溫、200℃、300℃、400℃、500℃、600℃、700℃、800℃等八種。2.本文取D10、D16及D25等三種鋼筋直徑,各三支分別進行火害試驗,其常溫降伏抗拉強度為398 至 493MPa。考慮的火害溫度有常溫、400℃、700℃ 及800℃ 。3.本文共製作26支RC短梁,其載重方式為簡支梁在中點施加集中載重。梁斷面尺寸有250mm*300mm 與250mm*400mm 兩種;梁支點跨度為85cm;混凝土常溫抗壓強度介於33.8至52MPa之間;梁的撓曲主筋比ρ=1.8%與ρ=2.6%;梁垂直剪力箍筋配置方式可分為無箍筋、#3@12cm 與#3@20cm等三種;火害溫度可分為常溫、400℃、700℃及800℃等四種。本文RC短梁試體皆全斷面等溫燒透至預定溫度才熄火降溫,且所有梁試體都是在同一部萬能油壓試驗機緩慢加載試驗,直到破壞。
試驗結果顯示:
1.對圓柱體試驗而言-本文建立火害後殘餘抗壓強度峯值應變與應力應變曲線經驗公式。並與試驗結果比較後發現殘餘抗壓強度之平均誤差為10.7%,殘餘峯值應變之平均誤差為7.0%。
2.對鋼筋試驗而言-本文發現楊旻森[*7]所建議的火害後殘餘抗拉降伏應力及殘餘抗拉極限應力公式仍屬可行。
3.對短梁抗剪強度試驗而言-本文修正現行ACI剪力規範公式後,建立了一套火害後RC短梁殘餘抗剪強度計算公式。其計算值與試驗值之平均誤差為12.9%。
The objectives of this paper were : 1.To establish the empirical equations for residual strength ; residual peak strain and the stress-strain curves of concrete after different temperature damages ; 2.To evaluate the residual shear capacities of RC short beams after fire damage.
The method of research were as follows:
1.Concrete cylinders with dimension∮15cm×30cm; f’c=29.7to50.9MPa ; fire temperatures=room temperature,200℃,300℃,400℃,500℃,600℃,700℃,800℃were tested.The residual stress-strain curve for each cylinder was recorded ;2.Three rebars were picked up for each D10,D16,D25 dimension. The yield stress of reinforcements at room temperature were from 398 to 493MPa.The fire temperature of rebar were : room temperature,400℃,700℃and 800℃.The residual stress-strain curves were recorded for all the tested rebars ;3.26 Simply supported short RC beams with one concentrated load at mid-span were tested. The cross-sectional dimension of beams were 250mm×300mm and 250mm×400mm.The span of beams was 85cm. f’c =33.8 to 52MPa;ρ=1.8%andρ=2.6%.Beams without stirrup,with #3@12cm and #3@20cm stirrups were designed for test. The fire temperatures were : room temperature,400℃,700℃and 800℃.The cross-sections of all the tested beams were heated to the target temperature completely and uniformly.All the beams were tested under universal machine up to failure.
The results of this paper were:
1. For concrete cylinder test-The empirical equations for the residual compression strength, the residual peak strain and the residual stress-strain curve were proposed. All the calculated values were compared to the tested values with reasonable errors : 10.7% for residual strength and 7.0% for residual peak strain.
2. For rebar test-It was found that the equations of residual yield strength and residual fracture strength of fire damaged rebars proposed by Yang et al(*7)were feasible for domestic fire damaged rebars.
3. For shear capacity test-A modified equation from the shear equation of the ACI code was proposed to calculate the residual shear capacities of RC short beams after fire damage.The calculated values were compared to the tested values with average error 12.9%.
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