2016 Fiscal Year Final Research Report
Discovery of internal crack in concrete members which cause rebar buckling and investigation of measures to improve deformation performance
| Project/Area Number |
15K14020
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | 鉄筋座屈 / 内部ひび割れ / 繰返し荷重 / 変形性能 / スターラップ / 耐震性能 |
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| Outline of Final Research Achievements |
It is well known that the rebar buckling is close relation to seismic performance of reinforced concrete member. In the study, a new mechanism of rebar buckling occurrence was proposed and the method to prevent buckling based on the proposed mechanism was investigated.
Regarding mechanism of rebar buckling occurrence, it was clarified by experiment and numerical analysis that there are internal cracks which propagate in the horizontal direction from the longitudinal rebars, even when the damage is not observed on specimen surface under cyclic loading.
Moreover, it was hypothesized that this internal crack closely relates to rebar buckling, and the cyclic loading test of RC members were conducted for controlling the progress of internal crack. It was shown that the rebar bucking is delayed due to suppression of internal crack propagation, and the deformation performance is improved even without stirrups.
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| Free Research Field |
コンクリート構造学
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