EFFECTS CAUSED BY A VARIATION OF THE LOAD SYSTEM ON A BULK CARRIER FLOOR SPECIMEN

The tests shown in this report have for their object to finalize a series of static tests carried out on the floor of a bulk carrier double bottom. At first (Techn. Bull. R.I.N.A. no. 25) the specimen of a floor, without lightening holes, was subjected by five suitably arranged jacks to a load condition according to which the tested specimen could be considered as a beam hinged at both ends. Then by a suitable arrangement it was possible to build up the end moment generally existing at the floor ends. Intermediate values of the end moment were also considered. Tests were repeated on a similar specimen but provided with lightening holes cut in different positions (Tech. Bull. R.I.N.A. no. 26). It has been possible in such a way to compare the stress distribution of the most stressed area of the floor, i.e. near the side sloping plate, the floor being either solid or holed. At this stage it was then necessary to obtain as general results as possible of the tests carried out, ascertaining how far the results could have been affected by the load distribution so far used upon the double bottom tank top of the tested floor specimens. Generally speaking, the load acting on the double bottom tank top of a bulk carrier may be compared to a load distribution greater toward the center of the floor than at its ends. Such a condition was in the whole sufficiently well simulated by means of different loads of the five jacks, by which the specimen was loaded during the tests carried out. However, such an arrangement allowed a jack, and thus a concentrated load, located just on the edges of the area throughly checked by strain gauge rosettes. The problem arose of ascertaining how far the stress concentrations noticed in the two series of tests could be influenced by the concentrated load. The series of tests shown in this report aimed to give an answer to this question, and this was done reducing to three the number of jacks originally used to load the specimen, and decreasing the span between the two outer jacks. In this way, it was possible to free the end areas of said floor from the local effect on concentrated loads.

• Corporate Authors:

  Registro Italiano Navale

  20 Via Vente Settembre
  Genoa,   Italy 
• Authors:
  • Tedechi, R
  • Agliano, S
• Publication Date: 1974-8

Media Info

• Pagination: 33 p.

Subject/Index Terms

• TRT Terms: Bulk carriers; Double bottoms; Hulls; Stresses; Transverse strength
• Old TRIS Terms: Hull stress
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00072533
• Record Type: Publication
• Source Agency: Registro Italiano Navale
• Report/Paper Numbers: No. 55 Tech. Bull
• Files: TRIS
• Created Date: Dec 19 1974 12:00AM