NEHRP Clearinghouse
- Title
- Dynamic Response of an Embedded Pipe Subjected to Periodically Spaced Longitudinal Forces.
- File
- PB80102932.pdf
- Author(s)
- Parnes, R.; Weidlinger, P.
- Source
- National Science Foundation, Washington, DC. Engineering and Applied Science., August 1979, 34 p.
- Abstract
- The dynamic response of pipe systems buried in soil is studied. The degree of interaction between the pipe and surrounding soil as well as the amount of damping is established for pipes subjected to incoherent motion. The model considered is represented by a pipe of diameter D subjected to time-harmonic longitudinal forces acting periodically at intervals L in alternating directions. Such a loading pattern corresponds to the incoherent component of earthquake excitation. The pipe and the soil are assumed to behave as linear isotropic elastic materials and the interaction between the surrounding soil and pipe is assumed to occur through a shear force mechanism acting at the pipe-soil interface. The response is found to be expressible in terms of non-dimensional ratios of density, velocity of wave propagation and the aspect ratio D/L of the pipe. Results are presented in terms of dynamic amplification factors for various applied frequencies of the applied forces. Peak response and resonant frequencies are determined and regions where radiation damping occurs are established. By choosing the suitable values of the governing parameters judiciously, the response can be obtained for either a continuous pipe or for an infinite train of pipe segments, interconnected by elastic joints at intervals L.
- Keywords
- Earthquake resistant structures; Buried pipelines; Subsurface structures; Dynamic response; Ground motion; Earthquake engineering; Soil structure interactions; Pipelines; Earthquakes; Dynamic structural analysis