Shear Performance of Mortise-and-Tenon Prestressed Joints in Prefabricated Metro Station Structures
[Objective] During the sinking construction process of prefabricated metro stations using the caisson method, the chain cutter equipment enclosing the station main structure imposes significant transverse shear forces on the assembled structural joints. To ensure safety and durability during both co...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Urban Mass Transit Magazine Press
2025-06-01
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| Series: | Chengshi guidao jiaotong yanjiu |
| Subjects: | |
| Online Access: | https://umt1998.tongji.edu.cn/journal/paper/doi/10.16037/j.1007-869x.20230549.html |
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| Summary: | [Objective] During the sinking construction process of prefabricated metro stations using the caisson method, the chain cutter equipment enclosing the station main structure imposes significant transverse shear forces on the assembled structural joints. To ensure safety and durability during both construction and operational phases, it is necessary to design a new type of joints and conduct focused research on its critical shear performance indicators. [Method] Using the transverse joint in the side wall of a prefabricated metro station in Changchun City as the research subject, a refined numerical model for the new type of mortise-and-tenon prestressed joint is established. Four-point shear tests are conducted on the mortise-and-tenon joint components connected by prestressed steel strands and prestressed bolts. A systematic analysis is carried out on the deformation of the joint components and the damage patterns of the concrete. [Result & Conclusion] During shear loading, both types of prestressed joints initially exhibit concrete damage at mortise bottom and on diagonal propagation of concave-side component. Subsequently, stress concentration and linear damage through the component are observed at the hand hole locations. Under working conditions with equal joint connector lengths, when the shear force reaches 1 100 kN, the maximum displacement of prestressed bolt joint remains below 0.5 mm, indicating higher shear stiffness compared to the prestressed steel strand joint. When the joint connector length is relatively short, it would neither fully participate in the overall shear resistance of the joint component nor lead to premature failure of the component. |
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| ISSN: | 1007-869X |