Steel Catenary Risers (SCRs) became the preferred riser systems with the development of deepwater oil and gas exploration. A new model for the dynamic analysis of SCRs is proposed in the paper, the rigid motion, which is the rigid rotation about the axis from the hanging point to the touch down point (TDP), is simulated in the new model. The rigid motion of SCRs is coupled with bending vibration model as inertial force and hydrodynamic damping, and then the out-of-plane motion of SCRs with both bending vibration and rigid motion are simulated. The case studies show that the rigid motion affects the dynamic response of SCRs greatly and can not be ignored in their dynamic analysis.

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