Abstract
The behavior of pipeline in liquefied ground is not fully elucidated. Therefore, the seismic design is not established systematically. The thrust force due to the bending angle and internal pressure constantly acts on the bend. The resistance for the thrust force is passive earth pressure behind the bend, but it is not considered that the passive earth pressure decreases when the liquefaction occurs. In this study, lateral loading tests were carried out in order to discuss the mechanical behavior of flexible joints pipeline with a bend in the liquefied ground. As a result, it was revealed that the horizontal resistance force decreases significantly, and the horizontal displacement of pipeline increases during liquefaction. In addition, it was confirmed that the numerical simulation modeled by beam and spring elements agreed well with the lateral loading tests.
