地铁预制装配式车站结构榫槽式预应力接头抗剪性能研究
严佳佳1臧延伟1刘长宝1章天杨1王博川2狄宏规2
Shear Performance of Mortise-and-Tenon Prestressed Joints in Prefabricated Metro Station Structures
YAN Jiajia1ZANG Yanwei1LIU Changbao1ZHANG Tianyang1WANG Bochuan2DI Honggui2
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作者信息:1.中国电建集团华东勘测设计研究院有限公司， 311122， 杭州
2.上海市轨道交通结构耐久与系统安全重点实验室， 201804， 上海
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Affiliation:1.Power China Huadong Engineering Corporation Limited, 311122, Hangzhou, China
2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20230549
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中图分类号/CLCN:U231.4
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栏目/Col:土建工程
摘要:
［目的］在沉井法预制装配式地铁车站下沉施工过程中，包络车站主体的链刀设备会对已拼合的装配式结构接缝产生较大的横向剪切作用。因此，需设计一种新型接头形式，并对其抗剪性能关键指标进行重点研究，以保障施工及运营阶段的安全性与耐久性。［方法］以长春地铁某预制装配式车站侧墙横向接头为研究对象，建立了新型榫槽式预应力接头的精细化数值模型，针对预应力钢绞线和预应力螺栓连接的榫槽接头构件进行了四点剪切试验，并对接头构件的变形、混凝土的损伤规律进行了系统分析。［结果及结论］在剪力加载过程中，两种预应力接头均先表现为凹侧构件榫槽底部和斜向延伸的混凝土损伤，随后手孔位置出现应力集中现象和贯通构件的直线损伤。在接头连接件长度相同的工况下，当剪力增加到1 100 kN时，预应力螺栓接头最大位移小于0.5 mm，相比预应力钢绞线接头表现出更强的抗剪刚度。接头连接件长度较短时未完全参与接头构件的整体抗剪受力或导致构件提前破坏。
Abstracts:
［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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