考虑地下连续墙影响的地铁站振动台试验

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Earthquake Engineering & Structural Dynamics Pub Date : 2024-04-24 DOI:10.1002/eqe.4136
Haitao Yu, Zhikun Wang, Zhongjie Zhang, Yi Song, Shu Liu
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引用次数: 0

摘要

地下连续墙通常用作地铁站建筑的支撑系统,与地铁站的内侧壁共同抵御来自周围土壤的压力。然而,人们对地下连续墙对地铁站地震反应的影响还不甚了解,至少在设计时没有充分考虑到这一点。本文设计了一系列 1 g 振动台试验,以研究考虑地下连续墙影响的典型两层三跨地铁站的地震响应。地层由合成模型土(砂和锯屑的混合物)模拟,模型结构和地下连续墙由带有镀锌钢丝的粒状混凝土制成。为了解地下连续墙对地铁站地震反应的影响,还进行了无地下连续墙结构的试验,并将其作为基准对比。试验的地震激励包括振幅分别为 0.2、0.4 和 0.8 g 的实际地震记录。根据试验数据分析,全面讨论了地下连续墙对地下结构抗震设计的影响。此外,还对目前地下结构抗震设计中忽视地下连续墙作用是一种保守做法的错误认识进行了评述。结果表明,地下连续墙的存在会增强结构的侧向刚度,从而显著减少地震时地铁站的侧向变形。值得注意的是,有地下连续墙的结构在加速度响应方面也表现出明显的放大,侧墙承受更大的动态土压力,此外,侧墙与地下连续墙连接处的应变在地震中也急剧放大。值得注意的是,地下结构的抗震设计应仔细考虑地下连续墙对结构动土压力放大的不利影响,以及侧墙端部与地下连续墙连接处内力的增加。
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Shaking table test for subway station considering the influence of diaphragm walls

Underground diaphragm walls are commonly used as a support system for the construction of subway stations, working together with inner side walls of subway stations to withstand the pressure from surrounding soils. However, the effect of diaphragm walls on the seismic response of subway stations is still not well understood yet, or at least not well considered during design. In this paper, a series of 1 g shaking table tests is designed to investigate the seismic response of a typical two-story and three-span subway station considering the influence of underground diaphragm walls. The stratum is simulated by synthetic model soil (a mixture of sand and sawdust), and the model structure and diaphragm walls are made by granular concrete with galvanized steel wires. A test case of the structure without diaphragm walls is also involved and taken as a benchmark comparison to understand the impact of diaphragm walls on the seismic response of subway station. The seismic excitations for the test include actual seismic records with the amplitude of 0.2, 0.4, and 0.8 g, respectively. Based on the test data analysis, a comprehensive discussion is conducted on the influence of diaphragm walls on the seismic design of underground structures. Current misconceptions that ignoring the role of diaphragm walls is a conservative way in seismic design of underground structures are also reviewed. Results show that the presence of underground diaphragm walls would enhance the lateral stiffness of the structure, and thus significantly reduce the lateral deformation of subway stations during earthquakes. Notably, the structure with diaphragm walls also exhibits a significant amplification in acceleration response and experiences greater dynamic earth pressures on the sidewalls, and furthermore the strains at the connection between the sidewalls and diaphragm walls are dramatically amplified during the earthquake. It is worth noting that these adverse effects of the diaphragm walls on the amplification of dynamic earth pressures on the structure as well as the increase of internal forces at the sidewalls end-diaphragm walls connection should be carefully considered in the seismic design of underground structures.

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来源期刊
Earthquake Engineering & Structural Dynamics
Earthquake Engineering & Structural Dynamics 工程技术-工程:地质
CiteScore
7.20
自引率
13.30%
发文量
180
审稿时长
4.8 months
期刊介绍: Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.
期刊最新文献
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