Upheaval buckling analysis of subsea pipeline by considering the effect of seabed friction using the power series method

چکیده مقاله

In this paper, the upheaval-buckling problem in subsea pipelines due to the effect of friction of seabed soil is investigated. Subsea pipelines are commonly laid unburied. Initial unevenness in the topography of seabed or later under scouring either may result in free spanning and produces upheaval buckling in pipelines. The abovementioned parameters can also cause serious harmful disasters. In order to evaluate the exact critical buckling loads of submerged pipelines, a numerical model based on power series expansions has been formed. In the proposed numerical method, the approximation function describing the buckling form of pipeline is derived by using the power series method and imposing the boundary conditions. The energy method is then used to evaluate the critical buckling load of subsea pipelines. One comprehensive example including of different types of pipelines are presented to verify the accuracy and validity of this method. The evaluated results are compared to the other available analytical methods.