NEHRP Clearinghouse
- Title
- Longitudinal Permanent Ground Deformation Effects on Buried Continuous Pipelines.
- File
- PB93116671.pdf
- Author(s)
- O'Rourke, M. J.; Nordberg, C.
- Source
- National Center for Earthquake Engineering Research, Buffalo, NY.; National Science Foundation, Washington, DC., June 15, 1992, 184 p.
- Abstract
- The response of buried steel pipelines to permanent ground displacement is investigated. Specifically, pipeline response to four different idealized patterns of longitudinal permanent ground deformation, wherein the non-recoverable soil movement is parallel to the pipeline axis, is considered. The pipe material is assumed to be linear elastic while the force-deformation relationship of the soil-pipeline interface is taken to be elasto-plastic (elastric spring-slider) or rigid-plastic (rigid spring-slider). The four patterns of longitudinal permanent ground deformation investigated are idealizations of patterns observed in past earthquakes. They are: (1) uniform ground strain (Ramp), and (2) symmetric uniform ground strain (Ridge). For the first two patterns, the exact response is determined and compared with a simplified model which neglects the elastic portion of the force-deformation relationship at soil-pipeline interaction. It is found that the simplified models predict maximum pipeline strains within 5 percent of the exact values. For the third and fourth patterns of longitudinal permanent ground deformation, results are presented for the simplified interface model (rigid spring-slider) only.
- Keywords
- Strains; Deformation; Mathematical models; Earth movements; Earthquake damage; Dynamic response; Earthquake engineering; Displacement; Soil-structure interactions; Pipelines; Soil mechanics; Soil-pipeline interface