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Research Papers: Structures and Safety Reliability

The Influence of Ship Collision Parameters on the Global Nonlinear Dynamic Response of a North-Sea Jack-Up Platform

[+] Author and Article Information
M. R. Emami Azadi

Assistant Professor
Azarbaijan S. Madani University,
East-Azarbaijan, Tabriz 5375171379, Iran
e-mail: dr.emami@azaruniv.edu

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 24, 2012; final manuscript received August 3, 2014; published online August 25, 2014. Assoc. Editor: John Halkyard.

J. Offshore Mech. Arct. Eng 136(4), 041602 (Aug 25, 2014) (11 pages) Paper No: OMAE-12-1041; doi: 10.1115/1.4028190 History: Received April 24, 2012; Revised August 03, 2014

In the present study, the influence of ship collision parameters related to vessel impact energy and also the impact scenario on the global nonlinear dynamic behavior of a three-leg jack-up platform is investigated. A North-Sea three-leg jack-up platform is studied as a case which is located in water depth of about 105 m. Nonlinear elastoplastic and hyperelastic type spring models are used for ship bow and broad-side impacts. A nonlinear elastoplastic type spud-can-soil interaction model is also applied. Loose sand to medium dense sand profile is considered at the sea-base. The effects of ship collision parameters such as ship mass and velocity, impact direction, hit point on jack-up as well as the spud-can-soil interaction are studied. For the first time, the supply vessel impact energy level far beyond 14 MJ as conventionally applied for ship-jack-up leg collision analysis (i.e., higher energy impact) has been also considered. The findings of this study indicated that the type of bow or broad-side impact as well as the spud-can-soil interaction may have considerable effects on the nonlinear dynamic behavior of the jack-up platform during ship collision. It is also found that ship collision in the direction of incident waves with mass of 5000 tons and impact velocity of 5 m/s displacement may have more profound effect on global dynamic response of the jack-up platform near ultimate collapse. It is also found in this research work that dynamic postimpact behavior of the jack-up platform may be greatly influenced by the combined action of extreme wave and current.

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References

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Figures

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Fig. 1

A view of a typical three-leg jack-up platform with a supply vessel nearby [3]

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Fig. 4

DNV-RP-C204 recommended nonlinear spring element load-indentation characteristics for supply vessel impact on jack-up platform

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Fig. 3

(a) A visualization of nonlinear spring element at ship impact point on node1 of chord EL3216 of jack-up platform; (b) a visualization of nonlinear spring element at ship impact point on node1 of brace EL1935 of jack-up platform, and (c) a visualization of nonlinear spring element at ship impact point on midspan of chord EL1316 of jack-up platform

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Fig. 2

Schematic load–displacement curves during ship impact on jack-up with various support conditions (modified after DNV [20])

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Fig. 5

A FE model of three-leg jack-up platform with spud-cans under action of extreme sea waves and current

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Fig. 6

Spud-can footing of jack-up unit (After Amdahl and Eberg [5])

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Fig. 21

Percentages of energy components: Es, Ess, Ej, and Ek during supply ship impact at node1 of EL3216 in Global X-Dir and Y-Dir

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Fig. 13

Global displacement time history of three-leg jack-up platform under ship impact at node1 of EL3216 in X-direction

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Fig. 18

Global displacement time history of three-leg jack-up platform under ship impact at node3 of EL1316 in X-direction

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Fig. 19

Force time history at impact ship element of three-leg jack-up platform under ship impact at EL3216 on windward leg in X-Dir

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Fig. 20

Force time history at impact ship element of three-leg jack-up platform under ship impact at EL3217 on windward leg in X-Dir and Y-Dir

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Fig. 24

A view of a supply vessel of size 7500 tons [20]

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Fig. 25

FE models of a typical supply ship bow (after Amdahl and Johansen [6])

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Fig. 7

A deformed model of three-leg jack-up platform under ship impact at node1 of chord EL3216 at leeward leg in X-Dir

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Fig. 8

A deformed model of three-leg jack-up platform under ship impact at node1 of chord EL3216 at leeward leg in Y-Dir

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Fig. 9

A deformed model of three-leg jack-up platform under ship impact at node3 of chord EL3216 at leeward leg in X-Dir

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Fig. 10

A deformed model of three-leg jack-up platform under ship impact at node3 of chord EL3216 at leeward leg in Y-Dir

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Fig. 11

A deformed model of three-leg jack-up platform under ship impact at node1 of brace EL1935 at windward leg in X-Dir

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Fig. 12

A deformed model of three-Leg jack-up platform under ship impact at node3 of brace EL1316 at windward leg in X-Dir

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Fig. 22

Percentages of energy components: Es, Ess, Ej, and Ek during supply ship impact at node3 of EL3216 in Global X-Dir and Y-Dir

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Fig. 23

Percentages of energy components: Es, Ess, Ej, and Ek during supply ship impact at node3 of EL1316 and node1 EL1395 in Global X-Dir

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Fig. 14

Global displacement time history of three-leg jack-up platform under ship impact at node3 of EL3216 in X-direction

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Fig. 15

Global displacement time history of three-leg jack-up platform under ship impact at node1 of EL3216 in Y-direction

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Fig. 16

Global displacement time history of three-leg jack-up platform under ship impact at node3 of EL3216 in Y-direction

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Fig. 17

Global displacement time history of three-leg jack-up platform under ship impact at node1 of EL1935 in X-direction

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