Abstract
Analysis of seismic response of pipelines buried in surface layer with irregular boundaries is presented here. A soil layer model which consists of two-dimensional upper and lower layers is solved by using the boundary element method for SH-type earthquakes. For the excitation of surrounding soil, strain and joint expansion of pipes under imperfect bonding at soil-pipe interface are analyzed. Results show that proposed method is fairly proper to express the phenomenon of strain concentration at the joints of pipes and a conventional aseismic design guideline overestimates the strain of slipped pipe for irregularly bounded layers.
