| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 104 === 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.
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