Development of fragility functions for natural gas transmission pipelines at anchor block interface

•Pipeline fragility functions are developed for ground shaking caused by earthquakes.•Buried pipelines are susceptible to local buckling failure near anchor blocks.•Pipelines buried in soft soils are more vulnerable than those buried hard soils.•Vulnerability of pipelines increases with increasing p...

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Bibliographic Details
Published in:Engineering structures 2019-05, Vol.186, p.216-226
Main Authors: Ashrafi, Hamed, Vasseghi, Akbar, Hosseini, Mahmood, Bazli, Milad
Format: Article
Language:English
Subjects:
Anchor block
Anchors
Buckling
Buried pipeline
Dynamic response
Earthquake
Earthquakes
Failure
Fragility
Fragility function
Gas pipelines
Gas transmission
Natural gas
Nonlinear analysis
Nonlinear response
Pipelines
Pipes
Seismic activity
Seismic response
Seismic waves
Soft soils
Soil hardness
Soils
Wave propagation
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Summary:•Pipeline fragility functions are developed for ground shaking caused by earthquakes.•Buried pipelines are susceptible to local buckling failure near anchor blocks.•Pipelines buried in soft soils are more vulnerable than those buried hard soils.•Vulnerability of pipelines increases with increasing pipe diameter. In this paper, fragility functions are developed for natural gas transmission pipelines at anchor block interface under the effect of seismic wave propagation. The fragility functions are developed for three typical pipelines in two types of soils. Seismic response of the pipeline at anchor block interface is evaluated by conducting non-linear dynamic response analysis of the pipeline system. The pipeline system consisting of the pipe, the anchor block, and the surrounding soil is subjected to ground shakings associated with a set of 36 earthquake records to develop the fragility function. The results of analyses indicate that the critical pipeline section is at pipe-anchor block interface where the pipe is susceptible to local buckling failure. The fragility functions are developed using strain limit state associated with local buckling of the pipe. The results of this study indicate that the vulnerability of pipelines to the local buckling failure at pipe-anchor block interface increases with increasing pipe diameter. Also because of the relatively large anchor blocks in soft soils, pipelines are more vulnerable to the local buckling failure in soft soils than in hard soils.
ISSN:0141-0296
1873-7323
DOI:10.1016/j.engstruct.2019.02.020