VIBRATION ANALYSIS OF SPANNING PIPELINE BURIED IN LINEAR ELASTIC SOIL WITH AXIAL FORCE

The Free vibration equation of a spanning pipeline buried in linear elastic soil is built with small deflection beam theory. Based on the stiffness characteristic of the buried segment, the boundary condition of the spanning segment is presented. The frequency equation of the spanning pipeline is achieved analytically, and the natural frequency of the spanning pipeline under different soil stiffness and axial forces is obtained numerically. The research shows that the vibration characteristic of the spanning pipeline is related to the axial force coefficient and soil stiffness coefficient. A beam of fixed supports at both ends and a simply supported beam model recommended in present rules are available for the spanning pipe only in several special cases. For the vibration analysis of spanning pipelines, the present model is suggested.