Vertical vibration characteristics of end-bearing barrette in homogeneous viscoelastic soil

被引：0
|
作者：
Cao G. [1 ,2 ]
Gong W. [1 ,2 ]
Zhu M. [1 ,2 ]
Dai G. [1 ,2 ]
Wang B. [1 ,2 ]
机构：
[1] Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing
[2] School of Civil Engineering, Southeast University, Nanjing
来源：
Gong, Weiming (wmgong@seu.edu.cn) | 1600年 / Southeast University卷 / 50期
关键词：
Barrette; Continuum; Hamilton's principle; Vertical vibration characteristics; Viscoelastic soil;
D O I：
10.3969/j.issn.1001-0505.2020.05.008
中图分类号：
学科分类号：
摘要：
To study the vibration characteristics of an end-bearing rectangular barrette subjected to a time-harmonic vertical force in homogeneous soil, a semi-analytic calculation method for the dynamic response of the barrette was proposed based on the modified Vlasov foundation model. First, the barrette-soil was regarded as a continuum, and the displacement model composed of the displacement function along the barrette axis and the attenuation functions along the horizontal direction was proposed. Then, the governing equations of the barrette-soil system and the expressions of the vertical shaft resistance of the barrette were established according to Hamilton's principle. Finally, the dynamic responses were calculated by the iterative algorithm. Parametric analysis results show that barrettes have the larger barrette head stiffness for the static and dynamic loads than the circular piles with the same cross-sectional area. As the aspect ratio of the barrette cross section increases, both the static and the dynamic barrette head stiffness increase, and the increment of the static barrette head stiffness is less while that of the dynamic stiffness is larger. The axial force along the barrette axis for the static loads is independent on the aspect ratio of the cross section while the dynamic axial force is sensitive. The dynamic stiffness of the shaft resistance is not affected by the aspect ratio of the cross section below the cut-off frequency. However, beyond the cut-off frequency, it decreases with the increase of the aspect ratio and is insensitive to the variations in the slenderness ratio of the barrette. © 2020, Editorial Department of Journal of Southeast University. All right reserved.
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页码：844 / 852
页数：8
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