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| Size effect theory on shear strength of RC cantilever beams without stirrups |
| Received:October 10, 2019 Revised:November 10, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20191010001 |
| KeyWord:shear-span ratio longitudinal reinforcement ratio shear strength RC cantilever beam size effect |
| Author | Institution |
| 金浏 |
北京工业大学 城市减灾与防灾防护教育部重点实验室, 北京 |
| 王涛 |
北京工业大学 城市减灾与防灾防护教育部重点实验室, 北京 |
| 杜修力 |
北京工业大学 城市减灾与防灾防护教育部重点实验室, 北京 |
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| Abstract: |
| Different from concrete materials,the failure modes and mechanisms of reinforced concrete (RC) members are very complex.It is difficult to describe the size effect of RC members by using the size effect theory of concrete materials.There is no systematic consideration of the influence of member size and longitudinal reinforcement ratio on shear capacity of RC beams in relevant codes of China.In order to study the effects of shear-span ratio and longitudinal reinforcement ratio on the shear failure and size effect of shear strength of RC beams without stirrups,a mechanical analysis model for shear failure of RC beams was established by using 3D meso-scale numerical simulation method,and the mechanism and regularity of the effects of shear-span ratio and longitudinal reinforcement ratio on the shear failure and size effect of shear strength of RC beams were studied.The results showed that the shear strength of RC beams exhibits a significant size effect:it decreases with the increase of shear-span ratio and increases with the increase of longitudinal reinforcement ratio;the effect of longitudinal reinforcement ratio on shear strength is particularly significant when the shear-span ratio is small.In addition,based on the Bažant's Size Effect Law (SEL) for materials,a theoretical formula for the size effect of shear strength of RC beams considering the effects of shear-span ratio and longitudinal reinforcement ratio is proposed.The accuracy and rationality of the proposed formula are verified by comparison the experimental results. |