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Dissertation
Earthquake resistance of buried pipelines
Doctor of Philosophy (Ph.D.), Drexel University
1995
DOI:
https://doi.org/10.17918/00007865
Abstract
A complete dynamic analysis is performed for the investigation of the behaviour of buried pipelines in a seismic environment. Axial and transverse displacements and axial and bending strains are evaluated. The effects of seismic ground motion parameters and structural and soil characteristics on the response of these extended structures are determined. These include: seismic ground motion frequency and velocity, which, combined, produce the ground motion wavelength; the material properties and geometrical configuration of the structure; the soil-structure interaction; and the soil classification. Sensitivity analyses with respect to these parameters are performed. Two types of resonance are identified in this space-time problem: frequency and spatial resonance. It is shown that spatial resonance (proximity of the ground motion wavelength with a mode shape of the structure) contributes more to the response than frequency resonance (proximity of ground frequency with a structural natural frequency). The significance of axial vs. bending strains is examined; the ground motion characteristics that yield dominant axial or bending strains are determined. Cases when slippage between the pipeline and the surrounding soil is likely to occur are identified. Based on the detailed analysis of the seismic response of pipelines, pipeline response spectra are introduced. The input motion at the supports of these long structures is described by the commonly used seismic ground motion spectra, which are available for the analysis of conventional "point" structures (buildings), and the estimated apparent propagation velocity of the motions of the ground surface; the pipeline response is approximated by simple expressions obtained through curve fitting of the actual analytical results. These response spectra can be readily used in the evaluation of the seismic resistant design of buried pipelines.
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Details
- Title
- Earthquake resistance of buried pipelines
- Creators
- Ahcene Larbi
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xiii, 180 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021889080504721