Abstract
The earthquake shake has a significant impact on the response of buried infrastructures; however, no study has been conducted on the behavior of buried flexible pipes subjected to earthquake shake. This paper investigates the transverse response of buried unplasticized polyvinyl chloride pipes subjected to transverse earthquake shake. A robust finite element model has been used to conduct this research. The influence of the pipes’ diameter, backfill height, peak ground acceleration, weight of the backfill, location of the rock layer, and predominant frequency of the earthquake has been investigated to provide insight into the seismic response of these buried flexible pipes. The results showed that the earthquake shake significantly increases the pipe wall thrust, pipe wall bending moment, and vertical diameter change. The results also showed that increasing the backfill height or the peak ground acceleration remarkably increases the earthquake response of the buried pipe. In addition, it was found that the weight of the backfill soil does not have a significant impact on the earthquake response of the pipe. However, the location of the earthquake shake is found to have a notable impact on the seismic response of the pipe; the closer the rock layer to the soil surface, the higher the seismic response. Finally, the results showed that increasing the predominant frequency of the earthquake shake decreases the earthquake response of the pipe. The results reported in this research are very useful to manufacturers of plastic pipes, pipeline design engineers, and researchers interested in the response of buried infrastructures.
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