Amir Moghiseh - master of science , young researchers club-islamic azad university -central tehran branch
Homauon Riahi - assistant professor , islamic azad university- central tehran branch

During recent decades, offshore pipelines have become an efficient means of transport for oil and gas. When pipelines are installed upon seabed and subjected to wave loading, there exists acomplex interaction between waves, pipelines, and seabed. An interaction model of the contact between thepipeline and the seabed are often referred to as a pipe soil interaction model. The pipe soil interaction model consists of seabed stiffness and equivalent friction definition to represent thesoil resistance to movement of the pipe. The equivalent friction is mainly based on coulombfriction (sand), cohesion (clay) or a combination of the two, the soil density. Also the weight of concrete coating is a decisive factor for the accomplishment of satisfactory pipeline stability. In this paper the dynamic stability of marine pipeline on the sea bed is investigated

marine pipeline, resonance, bending stress, vibration behavior