The Shear Bearing Capacity of Planar Gate Slots of Downstream Side Pier

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The Shear Bearing Capacity of Planar Gate Slots of Downstream Side Pier

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[1]LENG Fei,JIANG Yong,YU Jun,et al.The Shear Bearing Capacity of Planar Gate Slots of Downstream Side Pier[J].Journal of Zhengzhou University (Engineering Science),2025,46(06):144-152.[doi:10.13705/j.issn.1671-6833.2025.04.006]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 46 Number of periods: 2025 06 Page number: 144-152 Column: Public date: 2025-10-22

Title:: The Shear Bearing Capacity of Planar Gate Slots of Downstream Side Pier

Author(s):: LENG Fei¹; JIANG Yong¹; YU Jun²; CHEN Siyuan¹; 1.College of Civil Engineering and Transportation, Hohai University, Nanjing 210024, China; 2. School of Civil Engineering, Southeast University, Nanjing 211189, China

Keywords:: planar gate slot; shear bearing capacity; failure mode; ultimate bearing capacity calculation; hydraulic structures

CLC:: TV663TV33

DOI:: 10.13705/j.issn.1671-6833.2025.04.006

Abstract:: Due to the lack of systematic research, the formula of the shear bearing capacity of the planar gate slot was absent for a long time, meanwhile the Code for Design of Hydraulic Concrete Structures required the review of the shear bearing capacity of the planar gate slots subjected to large gate force. As a special study on the revision of the design code, an experimental study on the shear bearing capacity of the downstream side gate slots with free side and end was carried out. Taking the emergency gate slots in the diversion tunnel of Laxiwa Hydropower Station as the prototype, the static experiments of the shear bearing capacity of two batches of total 14 gate slots were conducted. The process of shear failure and the failure mode was studied, the influencing factors of the shear bearing capacity of gate slots were discussed. Based on the analysis of influencing factors and the regression of the test results, the calculation formula for the shear bearing capacity of the gate slot and the lower limit for the size and concrete strength were proposed, which were applied in practical engineering. The study showed that the shear failure of the gate slots was brittle, the failure mode of the shear failure was that the crack starting from the inner edge of the gate slot inclined and extended into the downstream part of the pier with the action of the shear force, and the failure occurred while the concrete of the remain section was not enough to bear the gate force. The tensile strength of concrete, the amount of transverse reinforcement, and the width of the neck of the pier were positively correlated with the shear bearing capacity of the gate slot, and the influence of transverse reinforcement had an upper limit. The proposed calculation formula could be used to review the shear capacity of the gate slot structures.

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Last Update: 2025-10-22