鋼筋配置對垂直承重牆結構物開孔之影響

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姓名

王郁勝(Yu-sheng Wang) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

鋼筋配置對垂直承重牆結構物開孔之影響
(The Influence of Rebar Arrangement around opening of Vertical Bearing Wall Structure)

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摘要(中)

承重牆結構在一般建築物或地下結構物占有很大一部分的承重能力，通常因門窗或其他設施需求，須於牆體施作開孔，而這些開孔將影響整體之承重能力甚至破壞模式，本研究即針對其開孔周圍補強鋼筋排置方式對牆體承重能力進行研究。
根據現行美國混凝土學會規範(ACI318-08)，其規定於承重牆結構之開孔補強方式僅有大略之方針，並無詳細描述補強鋼筋設計及排置鋼筋的方法，也因此為本研究之主要動機。
本研究製作7組承重牆縮小尺寸試體，並以單點荷重方式實驗其承重能力，其中以開孔與否及鋼筋排置方式做為主要控制變因，同時量測混凝土及鋼筋應變，並觀察試體的破壞情形。實驗結果顯示，牆體開孔處斷面積之折減率與損失之承重能力比例相當接近，可用於參考設計補強鋼筋量，其補強鋼筋依照主壓應變軌跡方向可使牆體具有最佳之承載能力。

摘要(英)

Bearing wall structures play an important role in common buildings and underground structures, and they usually have to make some openings in the wall structure as window, door or other facilitate essential services , which influence the performance and failure mode of RC walls very much. The objective of this investigation is to compare the bearing capacity and performance of RC walls with different reinforcements arrangement around openings.
According the American Concrete Institute 318 Standard, they have only a little guideline and information for reinforcement around openings of RC walls ,and they doesn’t mention how to design and arrange reinforcement around openings in detail in the content. Thus, the main motivation of this research is to investigate the influence of reinforcement arrangement around opening of bearing wall structure.
There are seven small-sized bearing wall specimens, and they are tested for bearing capacity under single point loading. The main variables investigated are the opening or not and reinforcement arrangement around openings. We measured the strain of rebars and concrete and observed the failure mode at the same time. The result shows that the reduction ratio of load capacity between opening specimens and non-opening specimens almost equal to the reduction ratio of cross-section area, and we can design the reinforcing steel ratio according to the value of reduction ratio. And the reinforcing steel arranged according to the trajectory of principal strain shows the most bearing capacity in walls.

關鍵字(中)

★ 開孔
★ 承重能力
★ 承重牆
★ 鋼筋混凝土

關鍵字(英)

★ Bearing Capacity
★ Opening
★ Bearing Wall
★ Reinforced Concrete

論文目次

目錄 i
第一章緒論 1
1.1研究動機 1
1.2研究目的及方法 1
第二章文獻回顧 3
2.1 承重牆軸力強度規定 3
2.2 承重牆排筋規定 5
2.3 開孔RC結構物補強相關試驗 7
第三章實驗規劃與執行 12
3.1試體規劃 12
3.2材料試驗 12
3.2.1鋼筋抗拉試驗 12
3.2.2混凝土抗壓試驗 13
3.3試體設計 13
3.3.1 N-PC承重牆試體 14
3.3.2 N-R承重牆試體 15
3.3.3 O-PC承重牆試體 15
3.3.4 O-R承重牆試體 16
3.3.5 O-R-S1承重牆試體 16
3.3.6 O-R-S2承重牆試體 17
3.3.7 O-R-S3承重牆試體 17
3.4試體製作 18
3.4.1鋼筋籠製作 18
3.4.2模板製作 18
3.4.3試體澆置及養護 19
3.4實驗設置 19
3.4.1位移量測系統 20
3.5實驗步驟 21
3.6數據處理 23
3.6.1主應變角度計算 23
第四章實驗結果 25
4.1 無開孔RC承重牆 25
4.1.1 N-PC承重牆試體 26
4.1.2 N-R 承重牆試體 27
4.2 開孔RC承重牆 29
4.2.1 O-PC 承重牆試體 29
4.2.2 O-R 承重牆試體 32
4.2.3 O-R-S1 承重牆試體 35
4.2.4 O-R-S2承重牆試體 39
4.2.5 O-R-S3 承重牆試體 42
第五章結果分析與討論 46
5.1承重牆荷重行為比較 46
5.1.1純混凝土試體 46
5.1.2一般牆內鋼筋配置試體 48
5.1.3具有開孔補強鋼筋之試體 50
5.2承重牆預測及比較 54
5.2.1承重牆軸壓強度預測 54
5.2.2 波松比(Poisson’s ratio)變化 55
5.2.3開孔周圍主壓應變角度變化 57
第六章結論與建議 59
6.1結論 59
6.2建議 61
參考文獻 63

參考文獻

參考文獻
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指導教授

王勇智(Yung-chih Wang)

審核日期

2010-7-15

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