Soil longitudinal variation effects on seismic behavior of buried pipelines

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Fadaei Farnaz; HASSANI NEMAT; SAFFARI HAMID

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Journal Paper

Paper Information

Journal: JOURNAL OF STRUCTURAL AND CONSTRUCTION ENGINEERING Year:2020 | Volume:6 | Issue:4 (29) Page(s): 23-37

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Information Journal Paper

Title

Soil longitudinal variation effects on seismic behavior of buried pipelines

Author(s)

Fadaei Farnaz | HASSANI NEMAT | SAFFARI HAMID | Issue Writer Certificate

Keywords

Buried pipelineQ1

EarthquakeQ2

Displacement time-history recordQ1

Pipeline intersectionQ1

Finite element methodQ2

Abstract

The purpose of this study is to investigate the behavior of continuous pipeline passing through two different layers of soil with different levels of resistance under displacement time-histories of the same Earthquake. The values of stress and displacement are studied for different angles between pipe and interface of soil layers. To this end, pipe and the surrounding soil are modeled using shell and solid elements, respectively, in ABAQUS Software. Stress and displacement values are calculated along the intersection and for different values of intersection angle between soil layer and pipeline and different values of Young's modulus of the soils. These evaluations indicate that, the maximum stress along the pipeline occurs at the node in certain distance before the interface in the harder soil. Moreover, with increasing the angle, the resulting displacement increases, and the value of stress increases with angles up to 30˚ , beyond which angle it decreases. Also, a decrease in the ratio of Young's modulus increases the stress both before and after the interface. Significant changes are observed in displacement and stress along the pipeline with changing the pipe thickness, so that a decrease in the pipe thickness in the studied model from 20 to 15 mm (33% reduction) results in some 15% increase in the stress. Soft soil (two-layered soft soil) increases pipe displacement and response capacity in every condition.

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APA: Copy

Fadaei, Farnaz, HASSANI, NEMAT, & SAFFARI, HAMID. (2020). Soil longitudinal variation effects on seismic behavior of buried pipelines. JOURNAL OF STRUCTURAL AND CONSTRUCTION ENGINEERING, 6(4 (29) ), 23-37. SID. https://sid.ir/paper/394080/en

Vancouver: Copy

Fadaei Farnaz, HASSANI NEMAT, SAFFARI HAMID. Soil longitudinal variation effects on seismic behavior of buried pipelines. JOURNAL OF STRUCTURAL AND CONSTRUCTION ENGINEERING[Internet]. 2020;6(4 (29) ):23-37. Available from: https://sid.ir/paper/394080/en

IEEE: Copy

Farnaz Fadaei, NEMAT HASSANI, and HAMID SAFFARI, “Soil longitudinal variation effects on seismic behavior of buried pipelines,” JOURNAL OF STRUCTURAL AND CONSTRUCTION ENGINEERING, vol. 6, no. 4 (29) , pp. 23–37, 2020, [Online]. Available: https://sid.ir/paper/394080/en

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