NEHRP Clearinghouse
- Title
- Seismic Response of a Buried Pipeline. I. Infinite Medium.
- File
- PB80211758.pdf
- Author(s)
- Datta, S. K.; El-Akily, N.
- Source
- National Science Foundation, Washington, DC. Engineering and Applied Science., June 1980, 29 p.
- Identifying Number(s)
- CUMER-80-3
- Abstract
- The study considered three main subject areas: (1) developing the three dimensional equations of motion of the shell taking into account the effects of transverse shear and rotatory inertia; (2) formally solving the equations of motion coupled with those of the surrounding medium; and (3) using the low frequency approximate expression of the traction force on the shell due to the surrounding medium for evaluating the spring constants of the elastic foundation approximating the infinite surrounding medium. These spring constants were shown to be dependent on the wavelength of the exciting waves, the mean radius of the shell, and the material constants of the surrounding medium. In order to facilitate analysis, the surrounding medium was considered to be infinite in extent and the interaction problem was solved for the case of axisymmetry. A model was developed of the general motion of a long straight buried pipe-line due to seismic waves. The special case of the axially symmetric motion of a pipeline excited by a travelling longitudinal wave was solved under the assumption that the inertia effects can be neglected.
- Keywords
- Shell theory; Seismic waves; Equations of motion; Subsurface structures; Dynamic response; Shells (Structural forms); Earthquake engineering; Soil structure interactions; Pipelines; Earthquakes