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Frequency spectrum method-based stress analysis for oil pipelines in earthquake disaster areas.

Wu X, Lu H, Huang K, Wu S, Qiao W - PLoS ONE (2015)

Bottom Line: To date, researchers have performed limited safety analyses of oil pipelines in earthquake disaster areas that include stress analysis.Feasible project enhancement suggestions based on the analysis results are proposed.The designer is able to utilize this stress analysis method to perform an ultimate design for an oil pipeline in earthquake disaster areas; therefore, improving the safe operation of the pipeline.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, China; School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu, Sichuan, China.

ABSTRACT
When a long distance oil pipeline crosses an earthquake disaster area, inertial force and strong ground motion can cause the pipeline stress to exceed the failure limit, resulting in bending and deformation failure. To date, researchers have performed limited safety analyses of oil pipelines in earthquake disaster areas that include stress analysis. Therefore, using the spectrum method and theory of one-dimensional beam units, CAESAR II is used to perform a dynamic earthquake analysis for an oil pipeline in the XX earthquake disaster area. This software is used to determine if the displacement and stress of the pipeline meet the standards when subjected to a strong earthquake. After performing the numerical analysis, the primary seismic action axial, longitudinal and horizontal displacement directions and the critical section of the pipeline can be located. Feasible project enhancement suggestions based on the analysis results are proposed. The designer is able to utilize this stress analysis method to perform an ultimate design for an oil pipeline in earthquake disaster areas; therefore, improving the safe operation of the pipeline.

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Stress of each bend with different Compaction coefficients.
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pone.0115299.g017: Stress of each bend with different Compaction coefficients.

Mentions: 2. Stress and displacement at the bends. As shown in Fig. 17 and Table 14, the stress values of the bends in the model that was constructed when the compaction coefficients were between 2 and 4 were all smaller than when the compaction coefficient was 5. Figs. 18–20 and Tables 15–17 are axial, lateral and longitudinal displacements of bends in different pipe models built for soil models with different compaction coefficients. The comparison shows that reducing the value of Compaction coefficient, the displacement in each direction changed in a similar pattern that stresses change, i.e., all showed an increasing trend after the first decrease. In summary it can be further concluded that reducing soil compaction degree appropriately could effectively reduce stress and displacements of the pipe in various directions.


Frequency spectrum method-based stress analysis for oil pipelines in earthquake disaster areas.

Wu X, Lu H, Huang K, Wu S, Qiao W - PLoS ONE (2015)

Stress of each bend with different Compaction coefficients.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4334484&req=5

pone.0115299.g017: Stress of each bend with different Compaction coefficients.
Mentions: 2. Stress and displacement at the bends. As shown in Fig. 17 and Table 14, the stress values of the bends in the model that was constructed when the compaction coefficients were between 2 and 4 were all smaller than when the compaction coefficient was 5. Figs. 18–20 and Tables 15–17 are axial, lateral and longitudinal displacements of bends in different pipe models built for soil models with different compaction coefficients. The comparison shows that reducing the value of Compaction coefficient, the displacement in each direction changed in a similar pattern that stresses change, i.e., all showed an increasing trend after the first decrease. In summary it can be further concluded that reducing soil compaction degree appropriately could effectively reduce stress and displacements of the pipe in various directions.

Bottom Line: To date, researchers have performed limited safety analyses of oil pipelines in earthquake disaster areas that include stress analysis.Feasible project enhancement suggestions based on the analysis results are proposed.The designer is able to utilize this stress analysis method to perform an ultimate design for an oil pipeline in earthquake disaster areas; therefore, improving the safe operation of the pipeline.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, China; School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu, Sichuan, China.

ABSTRACT
When a long distance oil pipeline crosses an earthquake disaster area, inertial force and strong ground motion can cause the pipeline stress to exceed the failure limit, resulting in bending and deformation failure. To date, researchers have performed limited safety analyses of oil pipelines in earthquake disaster areas that include stress analysis. Therefore, using the spectrum method and theory of one-dimensional beam units, CAESAR II is used to perform a dynamic earthquake analysis for an oil pipeline in the XX earthquake disaster area. This software is used to determine if the displacement and stress of the pipeline meet the standards when subjected to a strong earthquake. After performing the numerical analysis, the primary seismic action axial, longitudinal and horizontal displacement directions and the critical section of the pipeline can be located. Feasible project enhancement suggestions based on the analysis results are proposed. The designer is able to utilize this stress analysis method to perform an ultimate design for an oil pipeline in earthquake disaster areas; therefore, improving the safe operation of the pipeline.

Show MeSH
Related in: MedlinePlus