动力分析中人工地基边界处理方法对比研究

Compared analysis on artificial boundary methods for the dynamic response of soils

针对地基模型边界的近似处理问题,运用有限元方法分析了固定边界、等效粘弹性边界和无限元边界近似处理后的地基动力响应规律,借助已有的现场实测数据分析了各种边界处理方法的可操作性和精确性。结果表明:等效粘弹性边界和无限元边界均能反映边界辐射振动特性,从准确性角度来看,无限元方法具有更多优势。

For the foundation boundary approximation in the vibration analysis,dynamic responses of foundation treated by fixed boundary,equivalent viscoelastic boundary and infinite element boundary were obtained by using the finite element method.Operability and accuracy of various boundary methods w ere analyzed according to the m easured data.The results show that both the equivalent viscoelastic boundary and the infinite element boundary can better reflect boundary vibration characteristics,but infinite element method has a better advantage in terms of accuracy.