Seismic Response Analysis Of Buried Pipelines With High Drop

Pipeline transportation,as a common transportation mode,is widely used in water conservancy,oil and gas.Pipeline in the laying process,will encounter a variety of complex terrain.Especially in mountainous areas,pipelines are easily laid in places with large falls.China is a country with frequent earthquakes,pipeline in the process of operation,it is easy to suffer the damage of earthquake and secondary disasters,so it is very important to study the dynamic response of buried pipeline under the action of earthquake.In order to study the seismic response of buried pipeline with high fall difference,this paper has carried on the thorough research from three aspects: theory,experiment and finite element method.Research and results are as follows:(1)Selecting the boundary conditions of the spring instead of the small deformation section of the pipe and soil,considering the interaction between the pipe and the soil,based on the seismic traveling wave theory,a simplified model of the high drop buried pipeline theory is established,and a simplified algorithm is proposed.It provides theoretical basis for the seismic response test research and finite element analysis of buried pipelines with high drop.(2)Designed and manufactured an experimental device that can be used to study the seismic response of high-drop buried pipelines.Dynamic simulation was performed on 14 buried pipelines by simulating seismic vibration to obtain the strain of high-drop buried pipelines under the action of earthquakes.The data and acceleration data are used to study the influence of parameters such as pipe wall thickness,pipe diameter,inclination angle and seismic wave incident angle on the seismic response of buried pipelines with high drop.(3)Using ABAQUS large-scale finite element software,8 models corresponding to the test is established.Through numerical analysis,the deformation data and acceleration data of the pipeline are obtained and analyzed.Comparing the experimental data with the finite element data,the position of the maximum value of the pipeline is found,and a more accurate influence rule is obtained.