Abstract
When we have to regenerate the exact time behavior of underground pipes affected by seismic waves, it is important to make a precise model for the reciprocal action among slipping and exfoliation of them. However, it seems that a rational method for estimating the resistance of the circular section with a comparatively small diameter against earthquakes has not yet been established. Using parameter studies for sewer pipes with small diameters with changing the parameters such as coefficients of ground condition, sizes and underground depth of them under the existence of slipping and exfoliation, we tried to elucidate the size effect about the pipes affected by the shearing stress due to seismic waves. As the result, we obtained the knowledge about the size effect on the pipe enables us to exactly simulate the exact behavior of them.
