https://scholars.lib.ntu.edu.tw/handle/123456789/576105
標題: | Shear strength of reinforced concrete columns with five-spiral reinforcement | 作者: | Ou Y.-C Li J.-Y Roh H. Yu-Chen Ou |
關鍵字: | Columns (structural); Compressive strength; Concrete construction; Concrete compressive strength; Degree of conservatism; Premature failures; Reinforced concrete column; Shear reinforcement; Spiral reinforcements; Strength degradation; Transverse reinforcement; Reinforced concrete; column; cyclic loading; earthquake engineering; reinforced concrete; reinforcement; seismic response; shear strength | 公開日期: | 2021 | 卷: | 233 | 來源出版物: | Engineering Structures | 摘要: | Five-spiral transverse reinforcement for square reinforced concrete columns has been proven to possess a confinement capability superior to that of conventional rectilinear tie reinforcement. The objective of this research is to investigate the shear capacity of five-spiral reinforcement. Large-scale shear-critical five-spiral columns and comparable conventional tied columns were tested using double-curvature lateral cyclic loading. Test results showed that with the same amount and similar yield strengths of shear reinforcement and concrete compressive strengths, the column with five-spiral reinforcement exhibited a slightly lower shear strength than the counterpart tied column. All the five-spiral columns showed a lower speed of strength degradation after the peak load than counterpart tied columns. Failure of the five-spiral column under a high axial load was caused by fracture of the spirals. In contrast, failure of the rectilinear tie reinforcement was caused by premature failure of the hook anchorage. A modified Discrete Computational Shear Strength (DCSS) model was developed in this research for calculating the shear strength of five-spiral reinforcement. Comparison with the test results showed that the modified DCSS model provides conservative estimation of shear strength contributed by five-spiral reinforcement. Moreover, the DCSS model provides a degree of conservatism similar to the code equation for tie reinforcement. ? 2021 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100411037&doi=10.1016%2fj.engstruct.2021.111929&partnerID=40&md5=225ca179db221c7bcec792b7bf00650b https://scholars.lib.ntu.edu.tw/handle/123456789/576105 |
ISSN: | 1410296 | DOI: | 10.1016/j.engstruct.2021.111929 |
顯示於: | 土木工程學系 |
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