基于波传播方法的埋地管道的振动特性分析

VIBRATION CHARACTERISTIC ANALYSIS OF BURIED PIPES WITH THE WAVE PROPAGATION APPROACH

利用波传播方法从理论上分析了有限长埋地管道的振动特性.得到土壤结构耦合的频散方程.计算了埋地管道振动时的固有频率,通过与相关文献结果的比较,验证了该文理论分析和计算方法的正确性.数值计算结果表明埋地管道的固有频率,并不是在任何轴向和周向模态下都会出现,而是存在截止模态,土壤的剪切模量和管道参数对埋地管道的固有频率影响显著.

The wave propagation approach is used to analyze the vibration characteristic of a buried pipe. The coupled dispersion equation of soil-structure is derived and the free vibration frequency is calculated. Compared with those in literature, the results we obtained are confirmed to be correct. The effects of the soil's shear modulus and the shell's geometry parameters on the frequency are also discussed. It is found that the free vibration frequency of the pipe does not appear under all the axial or circular vibration modes, i.e., there is some cut-off mode, and the frequency can be significantly affected by the shear modulus of soil, as well as by the parameters of the pipe.