饱和地基上基础动力阻抗函数的一种分析方法

陈少林; 甄澄

doi:10.6052/0459-1879-2012-2-20120223

饱和地基上基础动力阻抗函数的一种分析方法

陈少林¹,
甄澄²

1.
东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 210096
2. 南京航空航天大学土木工程系, 南京 210016

基金项目: 国家自然科学基金 (50978135, 51178222), 江苏省自然科学基金 (BK2008396) 和东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题资助项目.

详细信息

中图分类号: TU311.3
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出版历程
- 收稿日期: 2011-08-24
- 修回日期: 2011-11-08
- 刊出日期: 2012-03-17

DYNAMIC IMPEDANCE OF FOUNDATION ON SATURATED POROELASTIC SOIL

Chen Shaolin¹,
Zhen Cheng²

1.
Key Laboratory of C&PC Structures, Ministry of Education, Nanjing 210096, China
2. Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016

Funds: The project was supported by the National Natural Science Foundation of China (50978135, 51178222), the Natural Science Foundation of Jiangsu Province (BK2008396) and Foundation of Key Laboratory of C&PC Structures.

摘要

摘要: 提出了一种基础阻抗函数的时域求解方法, 并用于饱和地基情形. 通过给基础输入脉冲位移, 应用集中质量显式有限元方法结合局部透射人工边界, 得到地基施加于基础的反力时程, 然后根据阻抗函数的定义, 应用傅立叶变换求得基础阻抗函数. 通过算例, 与 Halpern 的结果进行了对比, 验证了该方法的有效性. 并以一方形基础为例, 分别讨论了泊松比、孔隙率、渗透系数和埋深对无量纲动力柔度的影响. 与以往方法相比, 该方法可以考虑复杂地基情形和不规则基础形式.
- 饱和多孔介质 /
- 土--结构动力相互作用 /
- 局部透射人工边界 /
- 基础阻抗函数
Abstract: Based on the method of lumped-mass explicit finite element and local transmitting artificial boundary, a time domain method is presented for the computation of dynamic stiffness of rigid foundations resting on or embedded in saturated poroelastic soil. The two-phase behavior of porous medium is represented according to Biot's theory. The technique is applied to the computation of dynamic stiffness of rigid plate on a saturated poroelastic half-space. Compliance component are computed and compared with existing results. The effects of properties of porous medium and the embedded depth on the dynamic stiffness are examined. The method presented in this paper is able to represent more general properties and geometries of soil and foundation than the existing approaches do.
- saturated poroelastic medium /
- soil-structure interaction /
- local transmitting artificial boundary /
- dynamic stiffness of foundation

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参考文献(14)

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