HULL FRAMING SYSTEM (TRANS/LONGI)

The selection of a structural framing system in any vessel must be made from a consideration of weight (TO BE MINIMIZED) , production matters (TO BE ACCESSIBLE FOR WELDING, NDT) , suitability to resist global loads and vibration. Vessels can principally be either transversely or longitudinally frame (DEPEND ON POSITION OF SHIP).

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Two type of structure in basic frame section.

There are three type of Hull framing system:

Transverse Framing System

Longitudinal Framing System

Combined or Mixed Framing System (Hybrids framing system)

Transverse+Framing-+Many,+closely-spaced+Frames.jpg
Normally used for ship under 90m in length.

Advantages:

Resist Hydrostatic/local loading ( Bow & Engine room area, Cargo hold of Bulk carrier )

Absorb the vibration (E/R, Accommodation)

Disadvantages:

Heavier than Longitudinal framing system.

Much deformation during block fabrication.

The accessible for welding and NDT to be concerned during design.

Longitudinal+Framing-
Normally used for ship over 90m in length.

Advantages:

Resist the longitudinal bending stress due to sagging and hogging.

Lighter than Transverse framing system

Easier to optimize the weight due to the easy of global stress analysis on Longi.members

Speed-up in fabrication by Auto welding machines.

Disadvantages:

Welding seam will be increased.

The vibration problems will cause more buckling points at Cross structures.

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