The Static And Viv Induced Fatigue Damage Study Of Steel Catenary Riser

The steel catenary riser (SCR) is an important connector between a platform and the mouth of a well. Because the platform at the top of the riser will move horizontally and vertically, and the conditions of seabed can not be confirmed exactly, and the sag bend of the riser will undertake the loads caused by wave , current and marine grows, the riser system will undertake tremendously complex forces. So the mechanical analysis of the riser system becomes very important, and the static analysis of the riser system is the basis.First, this article introduces SCR's structural characteristic and the key technology of SCR and the study conditions of the world and the potential applications in our country. And then, the static loads are unfolded in detail, the static loads contain volume forces and structural permanent displacement of functional loads, internal and external hydrostatic pressures of pressure loads, current forces and floater offset of environment loads. Second, using ANSYS software carries out a static analysis model for the SCR. By compare, I decide to use the pipe element. By means of the static analysis of SCR, we can see that the maximum tension is at the connection of the floater and the SCR, and the maximum moment is at the touch down point. So we should pay much attention to this two positions when we are designing. Finally, the VIV induced fatigue damage is studied in detail, and I set up a simplified calculating method for the VIV induced fatigue damage.