Displacement response analysis of the SCR rigid body rotation under the wave and X direction motion of the riser hanging point effects based on Cable3D

Abstract

The steel catenary riser has a rigid body swing around the top suspension point and the bottom touch down point. The effect of rigid body oscillation on the displacement response of the transverse flow is not negligible. It is very important to calculate the swing displacement response of structural rigid body. The structure was imposed the wave action and the X direction action of the top suspension point that makes the rotation axies change. Based on the slender beam with large deflection model, wave model and the rigid body swing model, the influence of rigid body swing to the structure is studied. Calculation shows that structure under wave loading and X direction action, the percentage of rigid body swing impact on the structural is about 10%, increasing as the radius vector S, while decreasing with the decrease of the S. The trend is different from the waves and the top action decreasing with increasing of the depth of water. It is hoped that the above research can provide some reasonable and practical suggestions to the calculation of steel catenary riser.