Abstract: Long distance buried liquid-conveying pipeline is inevitable to cross faults and under earthquake action, it is necessary tocalculate fluid-structure interaction(FSI) in finite element analysis under pipe-soil interaction. Under multi-action of site, faultmovement and earthquake, finite element model of buried liquid-conveying pipeline for the calculation of fluid structure interactionwas constructed through combinative application of ADINA-parasolid and ADINA-native modeling methods, and the direct computing method of two-way fluid-structure coupling was introduced. The methods of solid and fluid modeling were analyzed,pipe-soil friction was defined in solid model, and special flow assumption and fluid structure interface condition were defined in fluidmodel. Earthquake load, gravity and displacement of fault movement were applied, also model preferences. Finite element researchon the damage of buried liquid-conveying pipeline was carried out through computing fluid-structure coupling. The influences ofpipe-soil friction coefficient, fault-pipe angle, and liquid density on axial stress of pipeline were analyzed, and optimum parameterswere proposed for the protection of buried liquid-conveying pipeline.
1 Introduction
After transient analysis of fluid-structure systemswas introduced by BATHE and HAHN[1] in 1978, theoryon the fluid-structure coupling was developed rapidly.The influence of fluid-structure coupling on the axialvibration in liquid filling pipeline was investigated, andtransfer matrixes were obtained with low frequencyvibration[2−3]; nonlinear dynamic stability of liquidconveyingpipes was analyzed[4]. As basis of theoryprogress, more attention has been paid on finite elementanalysis. Finite element equations of liquid-structure
coupling for liquid-conveying were obtained[5]; a finiteelement formula for the fully coupled dynamic equationsof motion including the effect of fluid- structureinteraction was introduced and applied to a pipelinesystem[6]. It is inevitable to cross faults for long distanceburied liquid-conveying pipeline. Therefore, the damage of buried pipeline is serious under earthquake action. Forexample, Tangshan earthquake in 1976, made the total water supply pipelines destroyed, and more than 10 ktcrude oil lost. In recent years,earthquakes in China, suchas Dayao earthquake of Yunnan Province in 2003,Dongwu earthquake of Inner Mongolia AUT.REG. in 2004, Yanjin earthquake of Yunnan Province in 2006,Puer earthquake of Yunnan Province in 2007, which made lots of buried pipeline damaged, especially Wenchuan earthquake of Sichuan Province in 2008.Therefore, influence of site and fault movement on theburied pipeline damage is another main problem[7−8]. Inthis work, fluid-structure interaction was combined with fault and site action, and fluid-structure coupling wascalculated under pipe-soil (site) interaction. Multiactionsof earthquake, fault movement, and gravity were applied, and influences of pipe-soil friction, fault, and liquid density on the axial stress of pipelines were analyzed.
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