COMPRESSION CAPACITY OF LOCALLY DEFORMED BURIED PIPES AND THE EFFECTS ON THE SEISMIC INTEGRITY OF PIPELINE

Abstract

 This paper describes the effects of local deformation, dent, and strain hardening properties on strain capacity in compression of a buried pipe.

 There were a few cases that the dents were found on the gas pipeline in Japan. Axial compression buckling experiment was conducted using the dented pipe and produced data such as stress-strain curves. Next, an analysis model that can reproduce the experimental results was established, and conducted various parameter studies. Those studies were the change in the depth of the dent, the internal pressure of the pipeline, earth pressure, and ground spring. The seismic integrity of the buried pipe was described in considering the depth of the dent, internal pressure, earth pressure and ground spring.