FORMULATION OF GROUND DISPLACEMENT RESISTANCE CAPACITY OF JOINT TYPE PIPES

Abstract

 Joint-type piping is often used in urban lifeline facilities because of its workability, but seismic resistance is ensured by the strength or deformation performance of the joint. The ground displacement resistance capacity is used to convert the performance against ground displacement that can be resisted. By substituting the conditions for each pipe into the idealized analysis model for evaluation, a guideline for seismic performance can be determined. Since the evaluation formulas currently used include a ground spring model and a model in which the ground spring yields, in this study, by assuming elasto-plastic type ground reaction force, two solutions are used to obtain the cross-sectional force of beam. Calculation formulas are proposed to determine resistance capacity of piping systems. Evaluation formulas that can be easily calculated with the minimum necessary parameters are useful for evaluating the seismic resistance of joint-type piping systems.