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Obtaining optimal performance with ring stiffeners on strength for submarine pipeline
176 viewed

Obtaining optimal performance with ring stiffeners on strength for submarine pipeline

Riahi, F

Obtaining optimal performance with ring stiffeners on strength for submarine pipeline

Riahi, F ; Sharif University of Technology

176 Viewed
  1. Type of Document: Article
  2. Abstract:
  3. Submarine pipelines as the principal structural components are prone to fail by circumferential buckling under the effect of hydrostatic external pressure. Basically, the buckling capacity of a thin-walled pipe is dependent on "radius to thickness" ratio. At least two modes of local and overall buckling are possible in any pipeline system, which could be developed in pipe wall. A method of strengthening of pipes is developed in this paper to stop the failure. A total of 21 stiffened models are generated and analyzed using the well-known finite element program ABAQUS. In this study, the buckling and post-buckling behaviour of stiffened pipes are investigated by carrying out linear and nonlinear analyses. The nonlinear finite element analysis presented in this paper is a parametric study which focuses on evaluating results sensitivity to ABAQUS nonlinear solution method of modified Riks arc-length solution algorithm. The results of inelastic Riks ultimate strength analysis cover a wide range of typical geometric ratios. For a precise post-buckling analysis, material and geometrical nonlinear analysis are considered. Once a nonlinear finite element study is conducted, comparison was made on the load-displacement response, ultimate strength and failure modes of pipelines. It was concluded that the proposed stiffening method is quite economical
  4. Keywords:
  5. Buckling ; Hydrostatic pressure ; Ring tilting ; Stiffening ; Submarine pipelines
  6. Source: World Applied Sciences Journal ; Volume 15, Issue 11 , 2011 , Pages 1494-1502 ; 18184952 (ISSN)
  7. URL: http://www.idosi.org/wasj/wasj15%2811%292011.htm