Seismic Response of Buried Pipeline System in a Soil Liquefaction Environment

A project to study the general seismic response behavior of buried pipeline systems during a soil liquefaction process has been initiated at Old Dominion University. Pipeline systems could be cross-type, T-type, Y-type or straight pipelines, with or without a manhole, and are buried in a soil liquefiable zone. Time varying soil's spring constants during the liquefaction process are used. The nonlinear damping of the soil surrounding the pipe includes geometric damping and material damping. The pipe body is assumed to be elastic but the joints of the segmented pipeline are considered to be elasto-plastic. A computer program based on finite element method has been developed. Modal superposition method is used to solve the equations of motion of the pipeline. The required eigenvalues and eigenvectors are calculated by subspace interactions. A few uncoupled modal equations of motion are solved by step-by-step numerical integration method. While the project is still on-going, this paper presents the formulation, background, verifications and results of simple systems.

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