Model tests of dynamic ice loading on the Chinese JZ-20-2 jacket platform

Timco, G.W.; Irani, Mehernosh; Tseng, J.; Liu, L. K.; Zheng, Changjie

doi:10.1139/l92-093

Cited by 26 publications

(9 citation statements)

References 4 publications

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“…In these investigations, the rigid structure on compliant foundation Timco et al, 1992Timco et al, , 1995 and the fully elastic structure (Cornett and Timco, 1998;Timco et al, 1997) were often adopted. In the tests with the compliant model or foundation, the coupling effect of structure response on ice force was the main consideration factor.…”

Section: Stiffness Of the Model Structurementioning

confidence: 99%

“…First, the research tests were mainly used to analyze the influences of some parameters onr ice load or to establish the application models of ice load. Second, the design tests were mainly used to analyze the ice loads on specific structures in structure design, risk analysis, safety evaluation, and other applications Timco et al, 1992Timco et al, , 1995Timco et al, , 1997. Cold Regions Science and Technology 120 (2015) 21-29 In this paper, laboratory tests on cones were performed at two scale factors of 6 and 3 in the ice tank of the Hamburg Ship Model Basin (HSVA).…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of dynamic conical ice force

Yue

et al. 2015

Cold Regions Science and Technology

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Section: Stiffness Of the Model Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study of dynamic conical ice force

Yue

et al. 2015

Cold Regions Science and Technology

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“…If an assessment index system is established based on the risk assessment theory, the safety level of various structures and the risk level of structural operation can be quickly assessed. Therefore, a structural risk assessment index system can be used as a basis for the more efficient and accurate structural safety analysis (Mangalathu et al, 2017;Melani et al, 2016;Sparks et al, 1994;Tromans and van de Graaf, 1994;Wang et al, 2012;Wu et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…On 28 January 2000, the JZ20-2 MS platform suffered from severe steady-state vibration due to the actions of level ice, causing a fatigue fracture in the evacuation pipeline of the No. 8 well, natural gas leakage, and platform suspension (Yue et al, 2009;Li et al, 2008;Timco et al, 2011). Since 2010, the aquaculture area affected by sea ice disasters has reached 40,000 ha per year (State Oceanic Administration, 2017).…”

Section: Introductionmentioning

confidence: 99%

Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay

Yuan

Liu

et al. 2020

Nat. Hazards Earth Syst. Sci.

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Abstract. Sea ice disasters seriously threaten the structural safety of oil platforms in the Bohai Sea. Therefore, it is necessary to carry out a risk assessment of sea ice disasters on oil platforms in the Bohai Sea. In this study, a risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay, in the Bohai Sea, was performed in five steps. Firstly, the formation mechanisms of sea ice disasters were analyzed and the sources and modes of sea ice risks were summarized. Secondly, according to the calculation formulas of extreme ice force, dynamic ice force, and accumulated force, several ice indices such as thickness, motion, strength, period, and concentration were proposed as the hazard indices, and corresponding values were then assigned to the proposed indices based on ice conditions in the Bohai Sea. Thirdly, based on four structural failure modes – structural overturning by extreme ice force (Mode 1), structural fracture failure caused by dynamic ice force (Mode 2), the damage of facilities caused by dynamic ice force (Mode 3), and structural function failure caused by accumulated ice (Mode 4) – the structural vulnerability index, overturning index, dynamic index, ice-induced vibration index, and function index were proposed, and corresponding values were assigned to the structural vulnerability index of fixed jacket platforms in Liaodong Bay. Fourthly, the weight of each risk index was determined according to previously recorded sea ice disasters and accidents, and the sea ice risk was then calculated with the weighted synthetic index method. Finally, with the above index system and risk assessment methods, the risk assessment of sea ice disasters on 10 jacket platforms in three sea areas in Liaodong Bay was carried out. The analysis results showed that efficient sea ice prevention strategies could largely mitigate the sea ice-induced vibration-related risks of jacket platforms in Liaodong Bay. If steady-state vibration occurs (usually in front of the vertical legged structure) or the structural fundamental frequency is high, the structural vulnerability is significantly increased and the calculated risk levels are high. The sea ice risk assessment method can be applied in the design, operation, and management of other engineering structures in sea ice areas.

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“…On January 28, 2000, the JZ20-2 MS Platform suffered severe steady-state vibration under the action of level ice, thus causing the fatigue fracture of the evacuation pipeline of the No. 8 well, natural gas leakage, and platform suspension Li et al, 2008, Timco et al, 2011. Since 2010, the aquaculture area affected by sea ice disasters has reached 40,000 hectares per year (State Oceanic Administration, 2011-2016).…”

Section: Introductionmentioning

confidence: 99%

Risk assessment of sea ice disasters on fixed jacket platforms in the Liaodong Bay

Xu¹,

Yuan²,

Liu³

et al. 2018

Preprint

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Abstract. Sea ice disasters seriously threaten the safety of oil platforms in the Bohai Sea. Therefore, it is necessary to carry out the risk assessment of sea ice disasters on oil platforms in the Bohai Sea. In the study, the risk assessment of sea ice disasters on fixed jacket platforms in the Liaodong Bay was performed. Firstly, the formation mechanisms of sea ice disasters were analyzed and the sources and modes of sea ice risks were clarified. Secondly, according to the calculation formulas of extreme ice force, dynamic ice force and accumulated force, several ice indices such as thickness, motion, strength, period, and concentration were proposed as the hazard indices and corresponding values were assigned to the proposed indices based on ice conditions in the Bohai Sea. Thirdly, based on four structural failure modes (structures overturned by the extreme ice force (Mode 1), structural fracture failure caused by dynamic ice force (Mode 2), facility damage caused by the dynamic ice force (Mode 3), and structural function failure caused by accumulated ice (Mode 4)), the structural vulnerability index, overturning index, dynamic index, ice-induced vibration index, and function index were proposed and corresponding values were assigned to the structural vulnerability index of fixed jacket platforms in the Liaodong Bay. Fourthly, the weight of each risk index was determined according to previous sea ice disasters and accidents and the sea ice risk was calculated with the weighted synthetic index method. Finally, with the above index system and risk assessment methods, the risk assessment of sea ice disasters on 10 jacket platforms in three sea areas in the Liaodong Bay was carried out. The analysis results showed that efficient sea ice prevention strategies could largely mitigate the sea ice-induced vibration-related risks of jacket platforms in the Liaodong Bay. If steady-state vibration occurred (usually in front of the vertical legged structure) or the structural fundamental frequency was high, the structural vulnerability was significantly increased and the calculated risk levels were high. The sea ice risk assessment method can be applied in the design, operation, and management of other engineering structures in sea ice areas.

show abstract

Model tests of dynamic ice loading on the Chinese JZ-20-2 jacket platform

Cited by 26 publications

References 4 publications

Experimental study of dynamic conical ice force

Experimental study of dynamic conical ice force

Risk assessment of sea ice disasters on fixed jacket platforms in Liaodong Bay

Risk assessment of sea ice disasters on fixed jacket platforms in the Liaodong Bay

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