ELASTIC AND POST-YIELD STABILITY OF FRAMING

This study investigates the stability of framing in the hulls of ice-going ships, with emphasis on the post-yield stability of angle main frames. The aim was to identify accurate and practical criteria for evaluation of post-yield stability. The approach was by an empirical analysis of the results of a parametric series of finite element evaluations. A Canadian Equivalent Standards-compliant 3x3 bay stiffened hull panel was modelled using the finite element method. The non-linear Finite Element Analysis (FEA) study was performed using a technique developed to enable main frame parameters to be varied independently. The series was performed to load levels exceeding the calculated Fmax ice load; load induced biaxial in-plane compressive loads were included. Limited relationships were established for the ship configuration studied. For wide variations in span, web depth, flange thickness and flange width, angle main frames did not experience buckling below a load level of 2*Fmax. Only two of the parameters affect the frame stability at the load levels of interest: web thickness and material yield strength. It was found impractical to develop realistic formulae resembling current criteria. Where critical, non-linear FEA should be performed to determine the specific post-yield buckling response of the designed structure. Procedures/guidelines should be developed for performing the non-linear analyses.

• Record URL:
  http://www.tc.gc.ca/tdc/summary/13900/13907e.htm
• Corporate Authors:

  Transport Canada

  Transportation Development Centre, 800 Rene-Levesque Boulevard West, Suite 600
  Montreal, Quebec  Canada  H3B 2X1

  Fisheries and Oceans Canada

  200 Kent Street, Station 7W080
  Ottawa, Ontario K1A 0E6,   Canada 

  Martec Limited

  1888 Brunswick Street, Suite 400
  Halifax, Nova Scotia B3J 3J8,   Canada 
• Authors:
  • DesRochers, C
  • Pothier, E
  • Crocker, J
• Publication Date: 2002-3

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 110 p.

Subject/Index Terms

• TRT Terms: Finite element method; Hulls; Icebreaking; Performance; Ship bodies; Ships; Stability (Mechanics); Testing
• Uncontrolled Terms: Post yield stability; Ship hull frames
• Subject Areas: Marine Transportation; Materials; Vehicles and Equipment;

Filing Info

• Accession Number: 00973848
• Record Type: Publication
• Report/Paper Numbers: TP 13907E, Final Report
• Files: TRIS
• Created Date: May 7 2004 12:00AM