摘要
针对有限单元法模拟实际为半无限土体时有限边界分析模型会引起较大误差的缺点,引入黏弹性人工边界结合有限元数值模型以便准确地描述循环动荷载作用下地基的响应问题。分别采用固定边界、黏性边界及黏弹性边界有限元3种方法计算了交通荷载作用下的地基响应。通过与Lamb问题解析解对比分析表明,黏弹性边界有限元数值模型的计算结果与解析解非常吻合,而固定边界、黏性边界数值模型的计算结果存在不合理现象。算例表明研究交通荷载作用下地基响应时,尤其是分析重复交通荷载作用下的残余变形,宜采用黏弹性边界有限元模型。
As the finite element method would cause great errors when simulating semi-infinite soil by existing boundary analysis model, a simple FEM with visco-elastic artificial boundary element was proposed to describe the dynamic behavior of the foundation due to cyclic loading accurately. First, FEM with fixed boundary, FEM with viscous boundary and FEM with visco-elastic boundary were used respectively to analyze the dynamic response of the foundation under vehicle loads. Then, all of them were compared with Lamb＇ s analytical solution. The results indicate that the calculation result of FEM with visco-elastic boundary agrees well with the analytical solution, while those of the others are unreasonable. The calculation example also shows that FEM with visco-elastic boundary is suitable for analyzing the response of the foundation under vehicle loads, especially for calculating the residual deformation induced by repeated vehicle loads.
出处
《公路交通科技》
CAS
CSCD
北大核心
2010年第1期39-42,49,共5页
Journal of Highway and Transportation Research and Development
关键词
道路工程
黏弹性边界
有限元法
地基
车辆荷载
road engineering
visco-elastic boundary
finite element method
foundation
vehicle load
