| 张西文,唐小微,渦岡良介.液化场地堤坝地震响应的自适应步长法数值模拟[J].水利学报,2014,45(9): |
| 液化场地堤坝地震响应的自适应步长法数值模拟 |
| Numerical simulation on seismic response of embankment on liquefiable sand using adaptive time stepping method |
| |
| DOI： |
| 中文关键词: 自适应步长法 后验误差评估 堤坝 地震液化 |
| 英文关键词: adaptive time stepping posteriori error estimation embankment seismic liquefaction |
| 基金项目: |
|
| 摘要点击次数: 3012 |
| 全文下载次数: 45 |
| 中文摘要: |
| 土体在地震液化过程中表现为较强的材料非线性，此时动力数值分析中时间步长过大必然导致较大的误差。本文在水土耦合弹塑性有限元法和Newmark 时域离散法的显式动力液化数值分析平台上，引入时域离散后验误差评估方法，并基于误差评估结果进行了时间步长的自适应调整，建立了基于自适应时间步长的液化动力数值分析方法，并将此方法应用于液化场地堤坝的地震响应数值模拟。通过分析堤坝算例，对比了自适应时间步长法和固定时间步长法计算的堤坝变形、超孔隙水压力比和平均相对误差等的变化规律。结果表明自适应时间步长法在土体动力液化显式数值分析中可以获得较高的计算精度，同时也可以提高计算效率、节省计算时间。 |
| 英文摘要: |
| In the process of earthquake liquefaction， the soil is characterized by high material nonlinearity.Larger time step size induces larger computational error in the dynamic numerical analysis. In this paper，based on the explicit numerical platform of solid-fluid coupled elasto-plastic finite element method and Newmark time domain discretization scheme， a posterior error estimator of temporal discretization and an adaptive time stepping method are implemented in the program， then the adaptive time stepping method is applied in the simulation of embankment seismic response. In the numerical example，the behavior of embankment deformation， excess pore water pressure ratio and average relative error using adaptive time step and fixed time step are compared. The results show that the proposed adaptive time stepping method can obtain
high calculation accuracy， and also can improve calculation efficiency and save computational cost in the explicit dynamic numerical simulation. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |