Vortex-induced Vibration Model of Span Segment of Buried Submarine Pipeline

摘要

Static deflections of submarine pipeline with span segment under self-weight and thermal expansion are analyzed in condition of elastic soil. The closed-form deflection and internal forces functions of both segments are yielded. Taken the static deflection of the span segment for mode shape function, mode shape factor and the first order frequency are calculated by energy balance method. Then, the VIV response at any current velocity can be determined according to DnV codes. The effects of soil stiffness and thermal load on VIV response are compared.