Abstract
This report proposes a practical method to calculate the structural deformation of buried pipelines under lateral displacement in the liquefied ground. Based on many cases of FEM analysis using shell/beam hybrid model, plastic hinge model is adopted to deal with the inelastic behavior of pipelines. Also, formula to estimate plastic moment of curved pipes, are proposed. The relationship between plastic hinge model and FEM is shown in some cases, these are nearly same. This proposed method is useful in practical design formula to calculate large deformation of pipelines, such as the deflection angle of the bend comer.
