Characteristic Mechanical Behavior for Flexible Pipes Having Different Thickness and Equivalent Bending Ring Stiffness

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  • 同一環剛性を有する管厚の異なるたわみ性パイプの力学挙動特性
  • ドウイツカン ゴウセイ オ ユウスル カンアツ ノ コトナル タワミ セイ パイプ ノ リキガク キョドウ トクセイ

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Abstract

Recently, adoption of pipeline as irrigation channel has increased to be satisfied variety needs of society. For cost reduction, pipelines having larger diameter and thinner wall has been advanced. However, it can be assumed that pipelines having extreme thin wall cause the buckling, and actual buried behavior of pipelines may be different from predicted buried behavior of pipelines at design. In this paper, the model tests for several flexible pipes, which each pipe has a different thickness and equivalent bending ring stiffness were conducted in a steel pit to discuss the influence of the thickness of pipe and ground stiffness behavior of pipes. As a result, it was found that the influence of the thickness of pipe upon the deflection and the distribution of bending strain was extremely small and the larger axial stress acts on the pipe with the thinner wall, and that the change of axial stress in infinitesimal section of pipe was larger with the thinner wall.

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