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Seismic analysis of buried pipeline in a 3D soil continuum

机译:3D土壤连续体中地下管道的地震分析

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An efficient numerical approach based on both boundary and finite element methods is developed in this work. This development is capable of realistic three dimensional analyses of soil-structure interaction problems in the real time domain and is specifically tailored to buried lifelines. In particular, boundary elements are used in a surface-only representation of the buried cavity problem for determining influence functions at the cavity/pipeline interface for the case of prescribed motions at the control point. Subsequently, these influence functions are converted into loads and are used as input to a finite element model of the pipeline. Following careful validation studies, the present methodology is applied to a real site with known seismological characteristics and the results are gauged against empirical design formulae. It is shown that the seismically induced stress state in a buried pipeline is more pronounced in the case of transverse vibrations than in the case of longitudinal vibrations.
机译:在这项工作中,开发了一种基于边界和有限元方法的有效数值方法。这种发展能够在实时域内对土壤与结构相互作用问题进行现实的三维分析,并特别适合于埋藏的生命线。特别地,边界元素用于掩埋空腔问题的仅表面表示中,用于确定在控制点进行指定运动的情况下,空腔/管道界面处的影响函数。随后,这些影响函数将转换为载荷,并用作管道有限元模型的输入。经过认真的验证研究,将本方法应用于具有已知地震特征的真实地点,并根据经验设计公式对结果进行评估。结果表明,与纵向振动相比,横向振动时埋入管道中的地震诱发应力状态更为明显。

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