Type Standard Bracket K

This appendix contains the specification of the bracket K and it is the basis for the bracket set-up data in the definition file going along with a standard delivery of Hull. This bracket is normally large and the number of stiffeners will vary with the size of the bracket.

Figure 3:1. Bracket type K.

The bracket is set-up based on the following conditions in addition to what can be interpreted directly from the figure above.

1. The bracket is symmetric, that means, the definition of arm B is equal to arm A.

2. The toe height is 15 mm, the length of the toe is 0.175 times the length of the bracket side, that means, 0.175*A and 0.175*B, respectively. The tangent of the arc of the toe in its starting point is at angle 75 degrees relative to the bracket arm.

3. The depth of the bracket perpendicular to the free edge (Z in the figure above) is a controlling parameter for the number of stiffeners.

4. All stiffeners should be picked from a defined set of profile sizes. No stiffener shorter than 700 will be set.

5. If Z<=750 at most one stiffener (S1) should be set. The profile size should be picked whose cross-section area is the closest smaller value compared to 0.1*t*L (t is the plate thickness of the bracket. For L, see the figure above). It should be located at 20 mm from the free edge.

6. If 750< Z<=1850 two stiffeners (S1 and S2) should be set. Their sizes should be calculated according to the same principles as described when there is only one stiffener. Their cross-section areas should be selected from

   0.6*0.1*t*L and

   0.4*0.1*t*L, respectively.

   S2 to be located at distance X2=0.4*Z from the free edge (cf. the figure above).

7. If 1850< Z<=2700 three stiffeners (S1,S2,S3) should be set. Their sizes are calculated from

   0.6*0.1*t*L,

   0.4*0.1*t*L and

   0.1*L3, respectively (for L3, see the figure above).

   S2 and S3 to be located at distances X2=0.28*Z and X3=0.59*Z, respectively.

8. If 2700< Z<=3550 four stiffeners (S1,S2,S3,S4) should be set. Their sizes are calculated from

   0.6*0.1*t*L,

   0.4*0.1*t*L,

   0.1*L3 and

   0.1*L4, respectively.

   S2, S3 and S4 to be located at distances X2=0.21*Z, X3=0.45*Z and X4=0.69*Z, respectively.

9. If, finally, Z>3550 five stiffeners (S1,S2,S3,S4,S5) should be set. Their sizes are calculated from

   0.6*0.1*t*L,

   0.4*0.1*t*L,

   0.1*L3,

   0.1*L4 and

   0.1*L5, respectively.

   S2, S3, S4 and S5 to be located at distances X2=0.17*Z, X3=0.36*Z, X4=0.55*Z and X5=0.74*Z, respectively.

10. Plate thickness and size (A, B) to be given by the designer.