Simplified equivalent fluid model for seismic response calculation of pipeline bridge
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Abstract:
In this paper, a simplified equivalent model was proposed to analyze the sloshing fluid in the pipeline bridge. The water motion in a pipeline bridge is assumed to be inviscid, irrotational, compressible, and linear (small displacement) . T he transverse sloshing fluid in a pipeline bridge can be simplified as a fixed rigid mass M 0 and a mass2spring system ( M 1 , K 1 ) . According to the equivalence rule, the actual fluid ( computed by the finite element model) and its equivalent model have the same the first sloshing frequency and the same effects on the pipe. The approximate analytical formulae of the fixed mass M 0 , mass2spring oscillator (M 1 , K 1 ) , and its locations in the pipe were acquired by the least2squares and curve fitting algorithms. T he simplified equivalent fluid model and fininte element model were used to calculate the first natural frequency and seismic response of a pipeline bridege (fluid 2structure coupling system). The numerical results calculated by the two fluid models agreed well, which confirmed the validity and accuracy of the equivalent model. Therefore, the simplified model of sloshing fluid can analyze the seismic response of the support structure of pipeline bridge, which can provide reference of seismic resistance for the researchers and structural engineers.