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| Research on the Shear Behaviors of Cap Transfer Beams with Steel Reinforced Concrete in the Subway Stations |
| WANG Bo |
| China Railway First Survey and Design Institute Group Co. Ltd, Xi'an, Shaanxi 710043, China |
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Abstract Research purposes: The mechanical properties of composite structure formed by subway stations and urban bridges are complex. In order to improve its mechanical properties, structural form of a double-channel steel reinforced concrete cap transfer beam is proposed. In order to explore the shear performance of this type of transfer beam, the author conducted shear performance tests on three reinforced concrete and five double-channel steel reinforced concrete cap transfer beam specimens. In the research, the shear failure process and failure form of the specimen were observed, the shear performance index of the transfer beam was obtained, and the influence of the shear-span ratio and the steel distribution ratio on the shear performance of the transfer beam was analyzed.
Research conclusions: (1) Under the action of concentrated load, the main oblique crack is formed near the connecting line between the support of the cap transfer beam and the loading point, and a typical shear oblique compression failure occurs. (2) Decreasing the shear-span ratio can effectively improve the bearing capacity of transfer beam, but the brittle failure of corresponding specimens is more serious. Under the condition of the same reinforcement ratio and shear-span ratio, the maximum increase on the bearing capacity of specimen with double-channel steel is about 111.8%. (3) Increasing the steel distribution ratio can improve the bearing capacity and deformation capacity of the specimen to a certain extent, and the maximum increase in the bearing capacity is about 6.87%. (4) The use of double channel steel reinforced concrete cap transfer beam in the composite structure of subway station and urban bridge has obvious advantages in mechanical properties. The research conclusion can provide reference for similar structure design.
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Received: 21 January 2022
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2022, Vol. 39 
