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Seismic Performance of Concrete Columns Reinforced with Weakly Bonded Ultrahigh-Strength Longitudinal Bars
| 题名： | Seismic Performance of Concrete Columns Reinforced with Weakly Bonded Ultrahigh-Strength Longitudinal Bars |
| 正文语种： | eng |
| 作者： | Takeuchi, Takashi;Sun, Yuping;Tani, Masanori;Shing, Pui-Shum Benson |
| 作者单位： | Kobe Univ Grad Sch Engn Dept Architecture Nada Ku 1-1 Rokkodai Cho Kobe Hyogo 6578501 Japan;Kobe Univ Grad Sch Engn Dept Architecture Nada Ku 1-1 Rokkodai Cho Kobe Hyogo 6578501 Japan;Kyoto Univ Dept Architecture & Architectural Engn Nishikyo Ku Kyoto 6158540 Japan;Univ Calif San Diego Dept Struct Engn 9500 Gilman Dr La Jolla CA 92093 USA |
| 关键词： | Residual deformation;Drift hardening;Bond-slip;Ultrahigh-strength reinforcement;Anchorage of reinforcing bar |
| 摘要： | This paper presents an investigation of the seismic performance of concrete columns reinforced longitudinally with steel bars (referred to as UHS-WB bars) that have an ultrahigh strength and a low bond strength. Nine cantilever columns were tested with variables including the type of longitudinal steel reinforcement, the anchorage method for the UHS-WB bars, the axial load ratio, and the shear-span ratio of the columns. The columns with securely anchored UHS-WB bars and shear-span ratios of 2.5 and 3.0 exhibited very stable hysteretic behavior and a mild hardening postyield behavior up to drift ratio of 4%, whereas the lateral resistance of the column with a shear-span ratio of 4.0 had a slight decline beyond a drift ratio of 1.5% due to significant P-delta effect. However, all the columns with securely anchored UHS-WB bars had a residual drift less than 0.5% after unloading from the drift of 3%. The stable response and low residual drift can be attributed to the low bond strength, which delayed the yielding of the UHS-WB bars. DOI: 10.1061/(ASCE)ST.1943-541X.0002886. (c) 2020 American Society of Civil Engineers. |
| 出版年： | 2021 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | 147 |
| 期： | 1 |
| 页码： | 04020290.1-04020290.12 |
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