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Technical Briefs

Dynamic Ice Force Analysis on a Conical Structure Based on Direct Observation and Measurement

[+] Author and Article Information
Ning Xu

National Marine Environmental Monitoring Center,
Dalian 116023, China
State Key Laboratory of Structural Analysis
of Industrial Equipment,
Dalian University of Technology,
Dalian 116023, China

Qianjin Yue

Department of Engineering Mechanics,
Dalian University of Technology,
Dalian 116023, China

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 5, 2010; final manuscript received October 1, 2013; published online November 12, 2013. Assoc. Editor: Longbin Tao.

J. Offshore Mech. Arct. Eng 136(1), 014501 (Nov 12, 2013) (6 pages) Paper No: OMAE-10-1031; doi: 10.1115/1.4025622 History: Received April 05, 2010; Revised October 01, 2013

In order to study dynamic ice force induced by ice-structure interaction, we adopted the most reliable method to directly measure ice force on full-scale structure. This paper mainly demonstrates the qualitative description on the basic model for dynamic ice forces based on direct measurement on the jackets with ice-breaking cone in the Bohai Sea. Temporal variations of ice force are recorded by the ice load panels, and corresponding ice failure processes on conical structures are recorded by video camera. It is found that, when an ice sheet acts on the upward narrow cone, bending failure occurs and broken ice pieces are completely cleared up by the side of the cone. The basic form of dynamic ice force in time domain is a series of impulse signals with minimum load of zero.

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Topics: Ice
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Figures

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Fig. 1

The JZ20-2 MUQ platform and schematic diagram of the measurement system

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Fig. 2

Physical model of ice load panel

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Fig. 3

Ice load panels on JZ20-2 MUQ platform

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Fig. 4

Ice force recorded by the load panels on JZ20-2 MUQ platform

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Fig. 5

Ice-cone interaction process

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Fig. 6

Ice force variation during the interaction between the ice and cone

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Fig. 7

Ice force press on a cone-shaped structure

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Fig. 8

Ice bending failure against the narrow cone

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Fig. 9

Broken ice removing styles during clearing process

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Fig. 10

Ice-induced structure vibration before piling up

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Fig. 11

Ice-induced structure vibration after piling up

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