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Trans RINA, Vol 157, Part C1, Intl J Marine Design, Jan - Dec 2015 A 3312mm FR C 21.2° FRX 5304mm FT D Figure 33: View of loading bay fromWFSV garage


Figure 36: Frame geometry FT


ΣMA ΣMA FRX FR


= 50 x 9.81kN = 49 = 0


90.5kN


= 490.5 x (5304 + 3312) – Fx x 3312 = 1276kN


= FRX/cos(21.2) = 1368.63kN


Area of pin material, (262MPa steel), to support the load. σ


A A


= F/A = F/ σ = 0.01


Figure 34: GA of loading bay 4.1(a) FEA of retractable bollards


advanced UKB nd


2 moment= 1020000mm Initially, max stress 164MPa


n 4


Moved central node up and down, increased to 171MPa, 173MPa. Moved central node to center of depth to gi ve minimum stress concentration.


L be


oading: The t e 32 tonnes,


hrust of the Mainprize vessel was taken to the worst ca


furthest from the supporting points. The FEA analysis of the bollard is shown in Figure 37. ase was to have 32 tonnes


design 8m2


Diameter of cylindrical pin cross section = 0.1514m Current beam used complies with UK eurocodes for


8231mm


B


Figure 35: Loads applied to bollards


Windfarm bollard J tubes on sub-station are rated to 50 tonnes acting horizontally. The worst case will be a 50 tonne force applied to the tip of the fender, this is equal to 25 tonnes acting on each bollard beam. The re forces at the support points of the frame are calculatedcu using loading magnitude and the frame geometry (figure 36) by moment equation methods.


eaction Figure 37: FEA analysis of th he bollard


© 2015: The Royal Institution of Naval Architects


C-1 19


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