| With the development of China's oil and gas pipelines,the pipeline inevitably has to cross rivers,lakes,and so on.Among so many types of the structure,which truss pipeline leaping pipeline because of its simple construction and many other advantages,it is widely used.Since most of the pipeline works are in areas with frequent earthquakes,it is necessary to study the dynamic characteristics of truss pipelines across the project under earthquake action.Firstly,by using the ANSYS finite element analysis software,in this article the finite element model of pipe and truss is established according to the length,span,truss section height,truss section and so on,which not only used to study the natural frequency,the natural vibration modes and the mechanical properties under the transient analysis of seismic waves,but also can study the seismic performance by analyzing its stress,strain and displacement.It turns out that the straight pipe has the best seismic performance,followed by 90 degree pipeline crossing and 45 degree pipeline crossing.Increasing the height of truss structure can improve the seismic performance.The truss section(inverted triangle)has the best seismic performance.Secondly,for the filling pipe is equivalent to the concentrated load acting on the truss nodes in the actual project,which ignores the common role of pipes and trusses.Therefore,this paper establishes the truss pipe across the whole model,studing its natural frequency and natural vibration mode and the seismic performance under the seismic wave transient analysis.Through the analysis of seismic performance:When the pipe and the truss work together,the truss maximum stress and the maximum strain become larger,and the maximum displacement is generally increased.Therefore,it will definitely cause some security risks and is not conducive to the structure of the seismic performance without the consideration of the joint action between the pipeline and the truss in the process of design. |
PDF Full Text Request