METHOD FOR ESTIMATING BEHAVIOR OF FAULT-CROSSING BURIED PIPELINE AND APPARATUS FOR ESTIMATING BEHAVIOR OF FAULT-CROSSING BURIED PIPELINE

摘要

PROBLEM TO BE SOLVED: To provide a method for estimating the behavior of a fault-crossing buried pipeline capable of achieving an accuracy in simplified manner without using a large-scale simulation apparatus.SOLUTION: The method comprises: a first step of obtaining the number N of earthquake-resistant joints required to absorb an amount H of fault displacement in a direction perpendicular to a pipe axis with respect to an allowed bending angle θand an effective pipe length L, and of obtaining a bending range Lin the direction of the pipe axis, based on [formula 1], [formula 2]; a second step of obtaining a load P(y) imposed on the pipe with respect to a relative displacement y between the pipe and the ground, based on [formula 3] according to a ground spring model in the direction perpendicular to the pipe axis, the model being defined using spring constants k, kwith a relative displacement δas a boundary; a third step of obtaining a bending moment distribution at each joint position, from the bending moment of a trapezoidal distributed load determined by [formula 4], and of obtaining a bending angle θ of each joint in accordance with a predetermined joint rotation spring model; and a bending performance evaluation step of evaluating whether or not the bending angle θ falls within the allowed bending angle θ.SELECTED DRAWING: Figure 19