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Model test to investigate reasonable reactive artificial boundary in shaking table test with a rigid container

振动台试验中刚性模型箱人工反射边界的合理设计试验研究

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Abstract

When conducting dynamic tests of underground structure by a rigid container, reasonable boundary conditions are one of the essential factors related to the accuracy of test results, especially the artificial boundary perpendicular to the excitation direction. On the basis of numerous studies, shaking table tests with four different typical boundaries are performed in this study. The tests consider the seismic intensity and seismic wave types. Then, the simulation effects of the four boundary conditions are evaluated from four aspects as follows: the differential rate of peak acceleration, acceleration curve, similarity of Fourier frequency spectra, and uneven soil settlement in rigid containers. Results show that the simulation effects of the boundary conditions are not only affected by the nature of the boundary material but also related to the seismic intensity, types of seismic waves, and filter characteristic of the filling medium in containers. In comparison with the other three types of boundary condition, foamed polyethylene shows the best simulation effect and its effect decreases gradually with the increase in earthquake intensity. Finally, on the basis of existing studies, the evaluation criteria of boundary effect, the principle for the selection of boundary material type and the thickness of boundary material are discussed and summarized, and the corresponding design methods and suggestions are then provided.

摘要

采用刚性箱进行隧道等地下工程结构地震动力试验研究时, 合理的边界条件是关系到试验结果准确的关键因素之一, 特别是与地震激励方向垂直的人工反射边界. 本文在大量文献调研的基础上, 设置四种典型边界, 并考虑地震烈度和地震波类型, 分别开展了振动台试验. 进而, 根据试验结果, 分别从加速度峰值偏差、加速度时程谱和傅立叶频谱的相似性以及刚性箱内土体表面不均匀沉降四个方面对四种边界的模拟效果进行了评价分析. 结果表明: 振动台试验中, 边界效应的大小, 不仅受边界材料性质的影响, 还与地震烈度、地震波类型以及试验箱内填充介质的滤波特型有关; 相对于其他三种边界, 聚乙烯泡沫板边界模拟效果最为理想, 且随着地震烈度的增大, 其边界效应有逐步减小的趋势. 最后, 结合既有研究资料, 对振动台试验中的边界效应评价标准, 边界材料类型及厚度的确定进行了讨论与总结, 给出了相应的设计方法和建议.

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Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, China

    Ming-feng Lei  (雷明锋), Bo-cheng Zhou  (周博成), Yue-xiang Lin  (林越翔), Fu-dong Chen  (陈富东), Cheng-hua Shi  (施成华) & Li-min Peng  (彭立敏)

  2. Key Laboratory of Engineering Structure of Heavy Haul Railway, Central South University, Changsha, 410075, China

    Ming-feng Lei  (雷明锋)

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  1. Ming-feng Lei  (雷明锋)
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  2. Bo-cheng Zhou  (周博成)
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  3. Yue-xiang Lin  (林越翔)
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  4. Fu-dong Chen  (陈富东)
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  5. Cheng-hua Shi  (施成华)
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  6. Li-min Peng  (彭立敏)
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Corresponding author

Correspondence to Yue-xiang Lin  (林越翔).

Additional information

Foundation item: Projects(51978669, U1734208) supported by the National Natural Science Foundation of China; Project(2018JJ3657) supported by the Natural Science Foundation of Hunan Province, China

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Lei, Mf., Zhou, Bc., Lin, Yx. et al. Model test to investigate reasonable reactive artificial boundary in shaking table test with a rigid container. J. Cent. South Univ. 27, 210–220 (2020). https://doi.org/10.1007/s11771-020-4289-y

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  • DOI: https://doi.org/10.1007/s11771-020-4289-y

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