Analysis Of Seismic Damage On Buried Pipeline Crossing A Fault

Buried pipelines, as a very important group of basic facilities and material base of our cities' living and developing, is called the underground lifeline engineering. Once they are destroyed in earthquakes, there will be great difficulties for the emergency management and restoration so that the loss of our economics and the casualty of our people would take place. Therefore, it is necessary to analyze the buckling response of buried pipelines to large fault movements and evaluate the anti-earthquake capability of buried pipelines. It will offer a basement for both the design, identify, reinforce and the emergency management of buried pipelines.On the basis of many previous theories, the response of buried pipelines crossing fault under the interaction of pipelines and soil, in this thesis, is analyzed, using the thin shell element. The main studies are following:At first, the research history of seismic response of buried pipelines is retrospected, and a lot of valuable conclusions are collected, then lots of factors influencing seismic damage are analyzed..Secondly, the Finite Element Analysis Method with twelve freedom degrees thin shell element is systemically introduced, and the response of buried pipelines is analyzed, considering the interaction of pipelines and soil, material nonlinearity of pipelines and soil, and the geometrical nonlinearity. The pipeline is discriticized into 4 node thin shell element structure, and soil is modeled by nonlinear springs. Furthermore, some theories on nonlinearity are discussed.Finally, many factors influencing seismic damage are analyzed through a practical examples, using ABAQUS, a general finite element program system. Some useful conclusions are drawn, such as, nonlinearity has a great influence on the behaviors of buried pipelines to large fault movements ; the conclusion by using thin shell model is more reasonable than using beam model.