Buried pipelines crossing thrust fault are prone to cause local or overall buckling or other forms of damages during earthquake.So it′s important for seismic design and constructions of buried pipelines to study the seismic response regulars of buried pipelines crossing thrust fault.The buried pipeline is separated from the semi-infinite earth medium together with the surrounding soil

and a three-dimensional finite element analysis model of pipeline-soil system is established using nonlinear contact treatment method.The pipeline is considered as the space thin-shell elements

while the surrounding soil is regarded as solid elements.The nonlinear contact elements are adopted to simulate the slip

the separation and the closure phenomena between the pipe and the soil.The fault movement is achieved by loading the linear displacements

and the initial stress condition of the system is considered at the same time.The pipeline-soil interaction system which presumes the surrounding soil does not crack is numerical analyzed with pseudo-static method.Some important influential factors

such as fault displacement

soil stiffness

buried depth

ratio of diameter to wall-thickness and crossing angle

are conducted.And some helpful conclusions are drawn.