The Effect of P-Wave Propagation on the Seismic Behavior of Steel Pipelines

Oskouei, Amin Ghaznavi; Oskouei, Asghar Vatani

doi:10.3311/ppci.9866

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…Roudsari [19] studied urban buried GRP pipes under both wave propagation and landslide effects using finite element model with soil constrains on pipe simulated as discrete nonlinear soil springs. Oskouei [20] used similar numerical methods to investigate seismic behavior of steel pipes under wave propagation effects.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Strength Evaluation of an Exposed River Crossing Pipeline with Casing Under Flood Load

Liu¹,

Zhang²,

Xia³

et al. 2018

Period. Polytech. Civil Eng.

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Pipelines in service always experience complicated loadings induced by operational and environmental conditions. Flood is one of the common natural hazard threats for buried steel pipelines. One exposed river crossing X70 gas pipeline induced by flood erosion was used as a prototype for this study. A mechanical model was established considering the field loading conditions. Morison equations were adopted to calculate distributional hydrodynamic loads on spanning pipe caused by flood flow. Nonlinear soil constraint on pipe was considered using discrete nonlinear soil springs. An explicit solution of bending stiffness for pipe segment with casing was derived and applied to the numerical model. The von Mises yield criterion was used as failure criteria of the X70 pipe. Stress behavior of the pipe were analyzed by a rigorous finite element model established by the general-purpose Finite-Element package ABAQUS, with 3D pipe elements and pipe-soil interaction elements simulating pipe and soil constraints on pipe, respectively. Results show that, the pipe is safe at present, as the maximum von Mises stress in pipe with the field parameters is 185.57 MPa. The critical flow velocity of the pipe is 5.8 m/s with the present spanning length. The critical spanning length of the pipe is 467 m with the present flow velocity. The failure pipe sections locate at the connection point of the bare pipe and the pipe with casing or the supporting point of the bare pipe on riverbed.Keywords finite element analysis, river crossing, buried X70 pipe, flood load, pipe soil interaction Period. Polytech. Civil Eng.X. Liu, H. Zhang et al.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Strength Evaluation of an Exposed River Crossing Pipeline with Casing Under Flood Load

Liu¹,

Zhang²,

Xia³

et al. 2018

Period. Polytech. Civil Eng.

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show abstract

“…The shear wave velocity of the soil represents the stiffness of the soil (G = ρc s 2 ) [18]. The natural frequency of a soil layer with a weightless foundation will be different, since this formula is based on a 1D model, but in the case of a rigid (strip) foundation the displacements will be 2D and in case of a circular foundation 3D.…”

Section: Harmonic Analysis For Horizontal Motionmentioning

confidence: 99%