Upheaval buckling may occur for subsea pipelines laid on the seabed with topographic step
imperfection under high temperature. In order to predict the post buckling behaviour of
upheaval buckling, a finite element model of ABAQUS is proposed to simulate upheaval
buckling for surface laid subsea pipelines with step imperfection. Firstly, a new method to
introduce a step imperfection from an originally flat seabed is presented. Then, the finite
element model of ABAQUS proposed in this paper is verified through the analytical results …