高強度鋼筋加勁超高性能纖維混凝土低矮型剪力牆之反覆載重行為;nonoe

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Title:	高強度鋼筋加勁超高性能纖維混凝土低矮型剪力牆之反覆載重行為;nonoe
Authors:	陳弘錡;Chen,Hung-Chi
Contributors:	土木工程學系
Keywords:	超高性能纖維混凝土;低矮型剪力牆;高強度鋼筋;ultra high performance fiber reinforced concrete;low-rise shear wall;high strength steel
Date:	2015-12-21
Issue Date:	2016-01-05 16:40:02 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究之目的為結合超高性能纖維混凝土與高強度鋼筋，以提升低矮型剪力牆之耐震行為，並藉由實驗結果探討ACI-318規範是否直接適用於新型低矮型剪力牆之設計。此外，探討ACI-318規範與軟化壓拉桿公式對低矮型剪力牆預測強度之準確性，並建議這些公式的適用範圍。由實驗結果得知，超高性能纖維混凝土與高強度鋼筋能有效延緩混凝土裂縫的發展，而超高性能纖維混凝土的多重開裂，使混凝土發揮應變硬化行為，顯著提升試體的韌性。超高性能纖維混凝土之纖維能分擔水平鋼筋之剪力，並有效提升試體之側向勁度與抗剪能力，不論試體搭配高強度鋼筋或一般鋼筋，試體之極限強度皆可提升8%以上。此外，使用綴縫筋之試體，即使提升40%之側向力，試體之滑移量能仍降低77%之滑移量。由規範探討得知，ACI -14-18.10公式計算高強度混凝土試體的剪力強度會嚴重高估，導致設計不保守而產生非預期的剪力破壞，使用ACI-14-11.5計算較為恰當。但超高性能纖維混凝土的試體使用ACI-14-11.5計算，均嚴重低估剪力強度。 ;The purpose of this study is combining Ultra High Performance Fiber Reinforce Concrete (UHPFRC) and High-Strength Steel (HS) to improve the seismic behavior of low-rise shear walls, and investgate whether ACI-318 can be used to design this kind shear walls or not. In addition, investgate the accuracy of shear strength formula which purposed by ACI-318 and softened strut-and-tie model. Then, suggest the scope for these formulas which have well estimation. Accoarding to the experimental results, UHPFRC and HS can effectively delay the expension of cracks. Strain hardening and softening behavior of UHPFRC enhance the ductility of specimens. The fibers in UHPFRC can bear the shear force in specimens, reduce the shear force in the horizontal rebars, and effectively improve lateral stiffness and shear resistance of the specimen. Either using the HS or Normal-Strength Steel, UHPFRC can enhance the ultimate strength of the specimen more than 8%. In addition, even though enhance 40% lateral force to the specimens, the dower bars can reduce sliding more than 77%. The shear strength formula of ACI -14-18.10 will excessively overestimate the High-Strength-Concrete (HSC) specimens, the less conservative design will cause unexpected shear failure. The shear strength formula of ACI -14-11.5 can effectively estimate the HSC specimens, but the formula will excessively underestimate the UHPFRC specimes.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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