Vortex-Induced Vibration Response Features of A Submarine Multi-Span Pipeline via Towing Tank Experimental Tests

Abstract In offshore engineering, the phenomenon of free span often occurs, and pipeline may have multiple spans adjacent to each other, forming a multi-span pipeline. The interaction different makes structural vibration characteristics more complex, which change fatigue affect safety structure. this paper, model tests were designed explore vortex-induced (VIV) pipelines investigate mechanism. experimental study mainly focused on dynamic response double-span pipelines, further extended triple-span hoping that results can be applied complex environment. effects span-length ratio, buried depth axial force VIV investigated discussed. varied with length. There was obvious between pipe-sediment obviously affected differences burial changed stiffness. With increase depth, amplitude presented downward trend. spanwise evolutions asymmetric caused by interaction. help identify in realize prevention control spans.