跨断层埋地管道反应分析改进的Newmark方法

在断层错动下跨断层埋地管道反应模拟方法中，壳模型有限元方法较简化索模型解析方法能更好地反映管道壳体反应特性，而目前国内外规范仍多采用便于应用的简化索模型解析方法。基于壳模型有限元方法，与索模型解析方法的对比计算分析，探讨了两类方法的管道轴向拉伸应变计算值差异及引起差异的主要因素，并在管道跨断层交角较小（小于70°）的情况下，提出了基于管道埋藏土层波速值和断层错动量两个参数的改进Newmark方法。进一步地计算分析表明，对于不同的管道跨断层交角和管材特性情况，改进的Newmark方法对壳模型方法计算结果的拟合度达到了0.87。

An improved Newmark method for analyzing response of buried pipeline crossing fault

The shell model finite element methods are better than the simplified analytical cable model methods in simulating shell deformation properties of pipe for the response analysis of buried pipeline crossing fault; but the cable model methods are still used in the relevant guidelines in China and other countries. The differences of estimated maximum tension strains of pipes and main factors inducing the differences are investigated based on the calculating results by a shell model method and the Newmark’s cable model method; and an improved Newmark’s cable model method is proposed by introducing an empirical relation with the fault displacement and wave velocity of surrounding soil for the case that the crossing angle between pipeline and faults less than 70 degrees. Furthermore, case studies show that the fitting degree between proposed method and the shell model method is not less than 0.87 for cases with different crossing angles between pipeline and fault and material behaviors of pipes.