设备-基础-地基体系协同工作非线性动力分析

Nonlinear Analysis on Dynamic Soil-foundation-Machine System Interaction

在考虑地基、基础和上部设备协同工作的基础上,对设备-基础-地基体系进行了非线性三维有限元动力分析。在分析过程中,根据粘-弹性半空间法计算了地弹簧的弹性系数,在满足计算精度的条件下,计算得到了一定程度的简化。根据实测的荷载时程曲线及设备的极限荷载,构造了人工荷载时程曲线,将其作为该体系的外部施加荷载,利用模态叠加法对该体系进行了动力时程分析。最后,通过一实例验证了该方法的合理性和精确性。

This paper presents three dimensional finite element nonlinear method for analysis of dynamic response of large dynamic machine foundation considering soil-foundation -machine interaction. Viscous-spring artificial boundary is constructed which can simulate not only the radiation damping of semi-infinite soil, but also the elasticity recovery capacity of the far field media on the boundary. The equivalent spring solid element is constructed for implementing the artificial boundary with FE program. The artificial historical load is presented according to load test. Analysis of dynamic response of Fuyang Sanshi project is performed by the method. Parameter investigation of major factors which affect dynamic responses of large machine foundation is carried out by numerical experiments and some useful conclusions are drawn.