Research on transverse impact performance of pipe-in-pipe structure

Pipe-in-pipe structure are widely used in offshore oil and gas transportation. The is subjected to various dynamic loads such as earthquakes vortex-induced vibrations during service, of which transverse impact the main cause damage. At present, whole process analysis parameter pipe-in-pipe under action not systematic complete. Based on explicit software LS-DYNA, finite element model was established, a parametric carried out parameters structure. three aspects force, displacement energy absorption, influence span, diameter ratio thickness resistance tube-in-tube revealed. research results show that force time-history curve can be divided into five stages. significantly influenced by span.