摘要
在三维有限元分析中,由于单元数量和自由度的数量巨大,为了简化计算和提高计算精度,有必要采用诸如使用对称约束等之类的简化模型。但实际研究中我们所依据的仅仅是理论上的对称约束进行简化,并没有研究对称约束对三维有限元分析的影响。因此,本文采用三维有限元分析方法模拟分析天津软土地基上某深基坑工程的开挖过程,研究了对称约束对支护体系内力和变形的影响,计算结果和实测结果比较的一致性,说明利用对称约束简化计算模型的可行性。
In the three dimensional finite element analysis （3D FEA）, thousands of elements and equations are used to simulate construction and excavation in foundation pit. Sometimes simplified models, such as symmetric constrains, are employed in order to reduce the mounts of elements and to obtain better evaluation, for example, symmetric constrains are used. However, the suitability of this method is not thoroughly considered before, and further research is required in 3D FEA, especially on soft ground. Here the theo- retical results are compared with practical project that is the biggest excavation in Tianjin. Theoretical evaluations show that it is suitable to use the benefits of symmetric constrains in 3D FEA in aspects of displace- ments and internal force of the support system. The reasons of choosing element type and deformation degree are discussed briefly at the supplement part.
出处
《低温建筑技术》
2009年第1期80-82,共3页
Low Temperature Architecture Technology
关键词
对称约束
三维有限元分析
计算模拟
Symmetric constrains
3 D FEA
computational simulation
