Design load aspects for the bow structure of ro-ro vessels are presented. A numerical method has been developed for the purpose of predicting bow impact loads that a ro-ro vessel may be subjected to during its operational life. The effects of the bow impact loads on ultimate strength and fatigue performance of the vessel bow door have both been investigated. The bow structure of the vessel is represented by strips normal to the bow stem profile in the numerical computational model. The hydrodynamic load on each of the normal strips is expressed in terms of known and published two-dimensional impact theories. The numerical computational method has been compared with two sets of model tests carried out in two different model basins. The agreement between the numerical computations and the model tests results is considered to be good. It is shown numerically and experimentally that the vessel speed, the bow stem angle and the bluntness of the bow end area are important for the bow impact load level. Computed design values of bow impact loads for ten ro-ro vessels have been compared with impact forces according the Det Norske Veritas (DNV) Classification Rules (1994 issue). The overall agreement between the numerical computations and the DNV Classification Rule values is considered satisfactory. Fatigue damage of the bow door supporting devices have been studies for two of the ten ro-ro vessels. It is found that fatigue, in general, does not present a problem provided that the bow door is designed according to the DNV Classification Rules (1994 issue) and normal strength steel is used.

  • Supplemental Notes:
    • RINA, Spring Meeting; 24 April 1996; London, UK. Ppr 3 [13 p, 19 ref, 8 tab, 21 fig]
  • Authors:
    • Kvalsvold, J
    • Svensen, T
    • Hovem, L
  • Publication Date: 1996


  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00728295
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Nov 4 1996 12:00AM