研究生: |
呂文堯 Wen-Yao Lu |
---|---|
論文名稱: |
鋼筋混凝土托架及含開口深梁剪力強度之研究 A Study of Shear Strength of Reinforced Concrete Corbels and Deep Beams with Web Openings |
指導教授: |
林英俊
Ing-Jaung Lin |
口試委員: |
林建宏
Chien-Hung Lin 黃世建 Shyh-Jiann Hwang 陳生金 Sheng-Jin Chen 陳正誠 Cheng-Cheng Chen |
學位類別: |
博士 Doctor |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2009 |
畢業學年度: | 98 |
語文別: | 中文 |
論文頁數: | 167 |
中文關鍵詞: | 托架 、含開口深梁 、剪力強度 |
外文關鍵詞: | corbels, deep beams with web openings, shear strength |
相關次數: | 點閱:299 下載:9 |
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本研究規劃39個剪跨-深比大於1之鋼筋混凝土托架試體進行試驗。試驗結果顯示,剪跨-深比愈小之托架,其剪力強度愈高。試驗結果亦顯示,混凝土抗壓強度愈高及垂直剪力鋼筋參數愈高之托架,其剪力強度也愈高。
本研究亦建議了一個托架剪力強度分析方法。本研究將托架試體試驗結果與本研究建議之分析方法、ACI規範之壓拉桿模型及ACI規範第11.9節之托架設計條款所得托架剪力強度分析值詳加比對。結果顯示,對於剪跨-深比介於0.11和1.69及混凝土抗壓強度介於14.5 MPa和105 MPa間之托架,本研究所建議之分析方法及ACI規範之壓拉桿模型皆能合理地預測其剪力強度。而ACI規範第11.9節之托架設計條款對於剪跨-深比較小、混凝土抗壓強度較高之托架,其所得剪力強度預測值有過於保守之現象。
本研究同時規劃了18個含開口鋼筋混凝土深梁試體進行試驗。試驗結果顯示,混凝土抗壓強度愈高及撓曲鋼筋參數愈高之含開口深梁,其剪力強度愈高。
本研究亦建議了一個含開口深梁之剪力強度分析方法。本研究將含開口深梁試體試驗結果與本研究建議之分析方法、Tan等人之壓拉桿模型及Kong 和 Sharp之經驗公式所得剪力強度分析值詳加比對。結果顯示,相較於Tan等人之壓拉桿模型,本研究建議之分析方法能更精確地預測含開口深梁之剪力強度。本研究所建議之分析方法能有效地掌握各參數對含開口鋼筋混凝土深梁剪力強度之影響。Kong 和 Sharp之經驗公式則無法有效掌握各參數對含開口深梁剪力強度之影響。
In this study, 39 reinforced concrete corbels with shear span-to-depth ratio greater than unity were tested. Test results indicate that the lower the shear span-to-depth ratio the higher the shear strength of corbels is. The higher the compressive strength of concrete the higher the shear strength of corbels is. The higher the vertical stirrup parameter the higher the shear strength of corbels is.
An analytical model for determining the shear strength of reinforced concrete corbels is also proposed in this study. The shear strengths predicted by the proposed method, the strut-and-tie model and the design provision of section 11.9 of the ACI Code are compared with available test results. The comparisons show that both the proposed method and the strut-and-tie model of ACI Code can reasonably predict the shear strengths of reinforced concrete corbels with shear span-to-depth ratio from 0.11 to 1.69 and with compressive strength of concrete from14.5 MPa to 105 MPa. The comparisons also show that the design provision of section 11.9 of the ACI Code is overly conservative for corbels with lower shear span-to-depth ratio and higher compressive strength of concrete.
In this study, 18 reinforced concrete deep beams with web openings were tested. Test results indicate that the higher the compressive strength of concrete the higher the shear strength of deep beams is. The higher the flexural steel parameter the higher the shear strength of deep beams is. An analytical model for determining the shear strength of reinforced concrete deep beams with web openings is also proposed in this study. The shear strengths predicted by the proposed method, the strut-and-tie model of Tan et al. and the empirical formula of Kong and Sharp are compared with available test results. The comparisons show that the proposed method can more accurately predict the shear strengths of reinforced concrete deep beams with web openings than the strut-and-tie model of Tan et al. The comparisons also show that the proposed method can simulate well the effect of various parameters on the shear strengths of reinforced concrete deep beams with web openings. The empirical formula of Kong and Sharp cannot simulate well the effect of various parameters on the shear strengths of reinforced concrete deep beams with web openings.
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