Abstract
In the seismic design of underground pipes, it is necessary to consider the influence of skin friction between structure surface and ground. Analyses of underground pipe models under influence of skin friction were conducted by Seismic coefficient method, to investigate the size effects. At the analyses, the diameters of structure models were 500mm, 1500mm, 3000mm, and 10000mm. JOINT elements were used for the models of skin friction between the structure model and the non-liner ground model. The results of the analyses, it was considered that the influence of interaction between pipes and ground, and size effects about t slipping and exfoliation behavior.
