Investigation of Response of Embedded Pipe in Two-Layered Soil Subjected to Near-Fault and Far-Fault Earthquakes

The behavior of pipelines during earthquakes depends on many factors such as fault movements, soil types, pipe material properties and connection details. On the other hand, damages in pipeline systems can also be seen due to relatively high peak ground acceleration values caused by wave propagation effects, or liquefaction, surface rupture that may be triggered by earthquakes. In this context, in the scope of the study, the effects of soil-structure interaction phenomenon as well as near-fault and far-fault earthquake effects on the behaviors of the pipe system have been investigated using the developed two-dimensional finite element model. Modal analyses of soil-pipe interaction system have been made for the different soil conditions and dominant mode frequencies of interaction system have been compared with dominant site frequencies obtained using a well-known approach. In addition, parametric analyses have been performed in the time domain using different soil systems and earthquake loadings. The changes in the behaviors of the pipe system have been comparatively examined for different soil conditions and earthquake loadings considered. The obtained results importantly draw attention to the fact that the responses of the pipe system may vary depending on the soil-pipe interaction, near-fault and far-fault earthquake loadings.