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| 研究生： |
林芳慶 Fang-Qing Lin |
|---|---|
| 論文名稱： |
高強度鋼筋混凝土梁剪力裂縫控制研究 Study on the shear cracking control for high strength reinforced concrete beams |
| 指導教授： |
邱建國
Chien-Kuo Chiu |
| 口試委員: |
廖文義
Wen-I Liao 林克強 Ker-Chun Lin 陳君弢 Chun-tao Chen |
| 學位類別： |
碩士 Master |
| 系所名稱： |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
| 論文出版年： | 2014 |
| 畢業學年度： | 102 |
| 語文別： | 中文 |
| 論文頁數： | 340 |
| 中文關鍵詞： | 高強度鋼筋混凝土 、剪力強度 、裂縫寬度 、跨深比 、容許應力 、剪力變形 、使用性 、修復性 |
| 外文關鍵詞： | high-strength reinforced concrete, shear crack, crack width, shear-span ratio, serviceability, reparability |
| 相關次數： | 點閱：458 下載：52 |
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本研究共進行十組四點荷重之簡支梁試驗，其中兩組斷面尺寸為400 mm(寬)×700 mm(深)，試體長度為6600mm，其於八組試體斷面尺寸為350 mm(寬)×500 mm(深)，試體長度為4600mm及2600mm各四組，依跨深比分為3.33、3.25、2.75、2.0和1.75五種，皆使用SD685之主筋(6根)搭配SD785之箍筋(箍筋間距300mm)，主筋比為2.04%及3.5%，箍筋比為0.21及0.24%，混凝土強度為70~90MPa。上述試體規劃主要以跨深比為參數，針對高強度鋼筋混凝土梁於剪力破壞下之剪力裂縫發展行為，除探討國內外規範及研究者建議公式之適用性外，將依剪力裂縫角度、裂縫寬度(最大值與殘留值)及構件變形角之量化關係，建立梁構件剪力變形角之評估公式，且由混凝土開裂剪應力、混凝土極限剪應力及構件斷面平均剪應力採線性迴歸之方法，建議各構件性能點之混凝土容許剪應力及箍筋容許應力，並建立高強度鋼筋混凝土梁構件使用性能(剪力裂縫寬度0.3mm)確保及修復性能(剪力裂縫寬度1.0mm)確保下，各構件性能點之容許剪應力計算式。
This work tests ten full-size simple-supported beam specimens with the high-strength reinforcing steel bars (SD685 and SD785) using the four-point loading. The measured compressive strength of the concrete is in the range of 70–90 MPa. The main variable considered in the study is shear span-to effective depth ratio. Base on the experimental date that include maximum shear crack width, residual shear crack width, angle of the main crack and shear drift ratio, a simplified equation are proposed to predict the shear deformation of the HSRC beam member. Besides of the post-earthquake damage assessment, these results can also be used to build the performance-based design for HSRC structures. And using the allowable shear stress at the peak maximum shear crack width of 0.3 mm and 1.0 mm to suggest the design formulas that can ensure serviceability (long-term loading) and reparability (short-term loading) for shear-critical high-strength reinforced concrete (HSRC) beam members.
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