城市轨道交通装配式地下车站新型构件连接方案的抗剪及抗震性能分析
周华海
Shear and Seismic Performance Analysis of New Component Connection Schemes for Urban Rail Transit Prefabricated Underground Stations
ZHOU Huahai
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作者信息:中铁第四勘察设计院集团有限公司， 430061， 武汉
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Affiliation:China Railway Siyuan Survey and Design Group Co., Ltd., 430061, Wuhan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.04.027
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中图分类号/CLCN:U231.4
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栏目/Col:研究报告
摘要:
［目的］为了进一步推广地下装配式结构在城市轨道交通工程中的应用，应对城市轨道交通车站明挖装配式出入口施工的关键技术（尤其是新型构件连接方案）进行研究。［方法］设计了由2块尺寸相同的不等边C形标准构件（有2道横向裂缝）拼接而成的城市轨道交通车站装配式出入口结构，基于此结构提出了一种新型的构件连接方案。通过模型试验及数值模拟，研究了该新型连接节点的抗剪性能和抗震性能，得出了不同受力条件下的荷载位移曲线、抗剪形态、抗震耗能及延性等指标，验证了该新型连接节点的可靠性。［结果及结论］装配构件的截面抗剪承载力远高于传统现浇截面抗剪承载力；型钢的存在可以充分保证试件的抗剪能力；“承插接口+型钢插板”是一种可靠的连接方式，其各项性能与现浇试件相比大致相当；型钢插入长度的变化对接缝处裂缝及其最大承载力的影响很小，建议选用的型钢插入长度等与构件厚度一致。
Abstracts:
［Objective］ To further promote the application of underground prefabricated structures in urban rail transit projects, research on key technologies (especially new component connection schemes) is conducted for the entry/exit construction of open-excavation prefabricated urban rail transit stations. ［Method］ A prefabricated entry/exit structure for urban rail transit stations is designed, consisting of two same-sized unequal C-shaped standard components spliced together (with two transverse cracks). Based on this structure, a new type of component connection scheme is proposed. Through model experiments and numerical simulations, the shear and seismic performance of the new connection node is studied. Under different loading conditions, various performance indicators, such as load-displacement curve, shear behavior, seismic energy dissipation, and ductility are obtained to validate the reliability of the new connection node. ［Result & Conclusion］ The shear bearing capacity of the prefabricated component sections is significantly higher than that of traditional cast-in-place sections. The presence of section steel can ensure the shear resistance capacity of the specimen. The ′socket interface+section steel insert plate′ is a reliable connection method, with its various performances roughly equivalent to those of the cast-in-place specimens. Changes in the insertion length of the section steel have minimal impact on cracks at the joint and their maximum bearing capacity. It is recommended to choose a steel insertion length that is consistent with component thickness.
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