（1.College of Transport &Storage and Architectural Engineering, China University of Petroleum, Dongying 257061；2. Shengli Engineering & Consulting Co., Ltd.）
Three-dimensional nonlinear finite element method has been used to simulate the process that the submarine pipeline is impacted by anchor or other dropped objects. The dynamic response analysis of submarine pipeline is obtained by using the Newmark method and N-R iterative method during impact. The effects of object shape, impact angle, friction, concrete thickness and internal pressure on pipeline are analyzed. The results show that the cube and sphere objects will produce larger maximum Mises stress of pipeline than that of cone, and the maximum stress has a proportional relationship with the conical angle. The Mises stress of pipeline reaches maximum at the impact angle of 90 degree; the friction makes little influence on the impact. The Mises stress of pipeline decreases as the concrete thickness increases and the decreased degree is becoming smaller as the thickness of concrete increasing; internal pressure make the Mises stress of pipeline bigger, but reduces the local deformation of pipeline, making more global deformation.
2009, Vol. 28 
