Structural Design and Response in Collision and Grounding

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Figure 37 - Macro flow diagram for side collision plastic-energy analysis of a single hull [24]Initially, the stiffened hull plating distorts in a plasticbending phase, with plastic “hinges’ forming in thevicinities of the strike and the web frames flanking thestrike. During this phase, insignificant membrane tensiondevelops. For a typical tanker with longitudinal anglesstiffening the hull plating, the longitudinal angle -shapedstiffeners then buckle in the vicinity of the flanking webframes, and possibly “trip” in the vicinity of the strike.Subsequently, the stiffened hull unloads momentarily asthe strike continues, but reloads in a membrane-tensionphase. The hull ruptures at the end of this phase, withpossibly the flanking web frames yielding or buckling
efore the hull ruptures. In such cases, the me mbranetensionphase includes two sub-phases: (1) there is notransverse movement of the web frames flanking thestrike; and (2) the web frames flanking the strike moveinward toward the ship’s centerline, and the damageextends into the adjacent web frame spaces. During thesephases, the deck is also distorting in membrane tension.However, the deck behavior is assumed not to affect thesequences of the options.Other sequences of phenomena are possible. A hullwith longitudinal stiffeners, such as rectangular bars thatare not apt to buckle or trip, tend to rupture beforesignificant membrane tension has a chance to develop.Alternatively, with any type of hull stiffeners, veryweak web frames can yield or buckle before rupture orbuckling of the longitudinal stiffeners, in which case thedamaged length increases during the bending phase.These phenomena are unlikely, however, for typicalships.Figure 38 - Macro flow diagram for side collision plastic-energy analysis of a double hull [24]21
Page 1 and 2: Brown, A.J., Tikka, K., Daidola, J.
Page 3 and 4: 3 PROBABILISTIC FRAMEWORKFigure 2 i
Page 5 and 6: 4.2.2 Method by Wang [15]Dr. Wang d
Page 7 and 8: damage results. Surprisingly, the t
Page 9 and 10: ybeginning of time step nStriking S
Page 11 and 12: location, COG, and detailed structu
Page 13: Ship Type150,000 dwtbulk carrierLen
Page 16 and 17: 6.2 DATA FOR MODEL VALIDATIONThe se
Page 18 and 19: Force (N)8.00E+087.00E+086.00E+085.
Page 22 and 23: enhance resistance to collision. Th
Page 24 and 25: Figure 42 - Load versus lateral ind
Page 26 and 27: Accidental Grounding and Collision

Structural Design and Response in Collision and Grounding

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