博碩士論文 983202003 詳細資訊




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姓名 許禎祐(Jhen-You syu)  查詢紙本館藏   畢業系所 土木工程學系
論文名稱 有鋼筋截斷之RC梁耐震行為探討
(Seismic behavior of RC beams with steel bar curtailment)
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摘要(中) 本實驗主要是施作符合現行規範設計之鋼筋混凝土梁,分別配置有無截斷的鋼筋在其中,進行耐震受力行為分析,討論鋼筋截斷梁受翼版的影響,以了解現今規範設計之適用性。
由實驗的結果得知,有無截斷的鋼筋之鋼筋混凝土梁在降伏載重、勁度與韌性表現相當。其破壞模式不受截斷的影響,都是由塑鉸區剝落大量混凝土的撓曲破壞。於鋼筋截斷的位置上因為有規範建議的超額箍筋保護,所以即便因翼版內的版鋼筋有貢獻,因而引入較多的剪力,也沒有對梁之鋼筋截斷處產生不良影響。
摘要(英) The purpose of this study is to observe the behavior of RC beams under cycling loading, which design by standard code. The beams have slab and steel bar cut-off in beam part. Test result will check the beams bar cut-off design according to ACI standard code, but without considering slab bar effect.
From the test result, it was found that the behavior of rectangular RC beam with steel bar cut-off is similar to prototype specimen. The similarity in seismic behavior includes strength, stiffness, and ductility. Both of rectangular beams have the same failure mode at the end of the experiment, concluding as flexural failure at near the column face. This is because, according to the standard design, there are excess stirrups at the end of the steel bar cut-off. Therefore, even the T-beam specimen has extra inducel shear provided by slab bars, there is no harm to the failure mode of the T-section beam, similar to rectangular beams.
關鍵字(中) ★ 鋼筋截斷
★ 耐震行為
★ 梁
★ 有效版寬
關鍵字(英) ★ effective flange width
★ Seismic behavior
★ steel bar cut-off
★ beam
論文目次 第一章 緒論..............................................1
第二章 文獻回顧...................................2
2.1 規範ACI 318-08對截斷長度之規定........................2
2.2 規範NZS 3101-2006對截斷長度之規定.....................4
2.3 ACI規範中耐震設計對混凝土梁的剪力強度規定.............6
2.3.1塑鉸區的抗剪強度計算............................6
2.3.2非塑鉸區的抗剪強度計算..........................6
2.4 ACI規範中耐震設計對梁橫向鋼筋設計規定.................7
2.5 拉力外移效應(Tension Shift effect)....................7
2.6 理論上提供的抗彎能力..............9
第三章 實驗規劃與設置....................................11
3.1試體規劃.............................................11
3.2材料試驗.............................................12
3.3試體製作.............................................12
3.3.1鋼筋籠製作...................................13
3.3.2模板製作.......................................13
3.3.3版筋綁扎與安裝吊帽.............................14
3.3.4試體澆置.......................................14
3.3.5試體的養護及拆模...............................15
3.4實驗架設.............................................15
3.4.1夾具設置.......................................15
3.4.2 施力系統......................................17
3.4.3量測系統.......................................17
3.5實驗方法與步驟.......................................18
3.6實驗數據處理.........................................18
3.6.1 理論標稱載重P_n.................................19
3.6.2 理論降伏位移∆_y.................................19
3.6.3 層間變位角DR與位移韌性比μ_∆....................20
3.6.4 柱端塊體旋轉角(fix end rotation)的影響..........20
3.6.5 Demec 量測之應力塊分布的處理...................21
第四章 實驗結果與討論....................................23
4.1 試體的實驗概況......................................23
4.1.1 無截斷之矩形梁 R1..............................23
4.1.2 有截斷之矩形梁 R1C.............................25
4.1.3有截斷之T字梁 T1C..............................27
4.2 版筋的應變...........................................28
4.3 截斷的影響...........................................29
4.4 混凝土應變的差異.....................................30
4.5 箍筋的貢獻...........................................32
第五章 結論與建議........................................34
5.1 結論.................................................34
5.2 建議.................................................35
參考文獻.................................................36
參考文獻 [1]ACI Committee 318, Building Code Requirements for Structural Concrete, ACI 318-08 & Commentary, American Concrete Institute, 2008.
[2]Standards Association of New Zealand, NZS 3101: New Zealand concrete structures standard, part 1- the design of concrete structures, part 2- commentary on the design of concrete structures. New Zealand, 2006.
[3]Y.C. Wang, “Analytical and experimental study on seismic performance of RC T-beams with design deficiency in steel bar curtailment.” Engineering Structures, Vol. 25, pp.215-227, 2003.
[4] J. Restrepo, R. Park and A. Buchanan, “Design of connections of earthquake resisting precast reinforced concrete perimeter frames.” PCI Journal September-October: pp. 68-80, 1995.
[5] Adam Walker, Assessment of Material Strain Limits for Defining Different Forms of Plastic Hinge Region in Concrete Structures, MS. Thesis,University of Canterbury, Christchurch, New Zealand, 2007.
[6] Ferguson PM, Matloob FN. “Effect of bar cutoff on bond and shear strength of reinforced concrete beams.” Journal of the American Concrete Institute, July: pp.5–23, July 1959.
[7] Paulay T, Priestley MJN. Seismic design of reinforced concrete and masonry building, John Wiley & Sons, New York, 1992.
指導教授 王勇智、洪崇展
(Yung-Chih Wang、Chung-Chan Hung)
審核日期 2012-7-27
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