Polar and Arctic Science and Technology

Results of Field Monitoring on Ice Actions on Conical Structures

[+] Author and Article Information
Ning Xu, Xiangjun Bi

 Dalian University of Technology, Dalian 116024, China

Qianjin Yue1

 Dalian University of Technology, Dalian 116024, Chinayueqj@dlut.edu.cn

Yan Qu

 China National Offshore Oil Corporation, Beijing 100027, China

Andrew Palmer

 National University of Singapore, Singapore 117576, Singapore


Corresponding author.

J. Offshore Mech. Arct. Eng 133(4), 041502 (Apr 12, 2011) (8 pages) doi:10.1115/1.4003392 History: Received June 18, 2009; Revised November 20, 2010; Published April 12, 2011; Online April 12, 2011

Ice-structure interaction plays a central part in determining ice loads and ice-induced vibrations. This is a controversial research issue, and many factors make the problem more complicated. The authors have been monitoring several ice resistant structures in the Bohai Sea for 20 years and have measured ice forces and simultaneously observed ice-structure interaction processes. This paper describes typical physical ice sheet–conical structure interaction processes, field data, and theoretical explanations for different ice conditions and structure dimensions. The conclusions are more widely applicable, and we relate them to field work on ice resistant conical structures in other ice-covered regions. Further work will quantify ice loads on conical structures once the interaction process is understood.

Copyright © 2011 by American Society of Mechanical Engineers
Topics: Ice , Force
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Figure 1

The JZ20-2 MUQ platform and sketch of measurement system on the platforms

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Figure 2

An ice-breaking cone and the load panels on the cone

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Figure 3

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

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Figure 4

Ice force variation during the ice-cone interaction

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Figure 5

Ice bending failure against a narrow cone

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Figure 6

The influence by ice velocity to the broken ice state front of the acting incline/cone: (a) low ice velocity about 0.15 m/s and (b) high ice velocity about 0.60 m/s

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Figure 7

The influence of ice thickness to the broken ice state front of the acting incline/cone: (a) thin ice less than 0.1 m, (b) ordinary thickness ice around 0.15 m, and (c) thick ice more than 0.20 cm

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Figure 8

Two causes to the change in cone diameter at water level: (a) The tide range induced water level fluctuation. (b) Different structures with different ice-breaking cones; JZ20-2 MUQ: d=1.2 m; D=4 m. (c) JZ20-2 NW: d=3.5 m; D=6 m.

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Figure 9

The influence by cone diameter at the water level (D) and the ratio of D/h (ice thickness) to the broken ice state front of the acting incline/cone: (a) h: about 0.10 m; D: 2 m. (b) h: about 0.20 m; D: 2 m. (c) h: about 0.10 m; D: 3.5 m. (d) h: about 0.20 m; D: 3.5 m. (e) h: about 0.10 m; D: 5 m. (f) h: about 0.20 m; D: 5 m.

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Figure 10

The difference between broken ice gathering and ice jamming, and narrow structure and wide structure: (a) break ice mound mode on narrow structure, (b) ice sheet breaking at narrow cone, (c) ice jamming on wide structure, and (d) ice sheet breaking at pile-up/jamming on wide structure

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Figure 11

Kemi-1 light house

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Figure 12

Confederation Bridge




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