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本文以ANSYS软件为平台建立了近底床钢管-混凝土单层悬跨海管有限元模型，综合应用PIPE59单元、MATRIX27单元和COMBIN40单元模拟了管内流体流动引起的科氏力、离心力以及海管与底床的弹性接触，计算了不同悬跨长度下的海管位移、应力及固有频率，通过与工程常用规范对照，验证了模型的正确性。研究表明，应用ANSYS软件可模拟近底床悬跨海管在内流、外流共同作用下的位移、应力及固有频率，本文建模方法便于工程应用。

Producing model of a near seabed spanning pipeline based on ANSYS

The finite element model is built up for the spanning pipeline composed of steel pipe and concrete lay by ANSYS software. The PIPE59 element, MATRIX27 element and COMBIN40 element are used to simulate coriolis force and centrifugal force due to internal flowing, and contact between the pipeline and sea bed. The displacements, stresses and natural frequencies of the pipeline are calculated with various span lengths. Then the model is verified by comparing with CAM and DNV engineering codes. The results identify that the ANSYS software can be used to simulate the response of the near-bed pipeline with internal and external flow. The method of building model should be used to engineering easily.