Physical Mechanism of Ice-Induced Self-Excited Vibration
Publication: Journal of Engineering Mechanics
Volume 138, Issue 7
Abstract
Steady amplitude vibration on cylinder structures caused by dynamic ice loading has been observed during the measurements on prototype structures. Further analysis indicates that it belongs to self-excited vibration, in which the vibration amplitude stays constant and the frequency of the dynamic ice load is locked by the frequency of the structural vibration. Based on the conclusions from ice mechanics, this study proposes a physical mechanism to describe the ice-induced self-excitation process: during the loading phase within a single vibration cycle, the compressive strain rate in the ice sheet close to the structure enters a ductile-brittle transition range, and thereby the steady formation of micro cracks maintains the resistance of the ice sheet as the ice load steadily increases; when the density of cracks in the ice reaches a critical level, cracks coalesce and collapse, resulting in the unloading phase. In this way structure vibration dominates the time-variation of the ice load. The proposed mechanism is verified using field data.
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References
Blenkarn, K. (1970). “Measurements and analysis of ice forces on Cook Inlet structures.” Offshore Tech. Conf., OTC 1261, Houston, TX, Vol. II, 365–378.
Engelbrektson, A. (1983). “Observations of a resonance vibrating lighthouse structure in moving ice.” Proc., 7th Int. Conf. Port Ocean Eng. under Arctic Cond. (POAC), Helsinki, Finland, Vol. II, 855–864.
Engelbrektson, A. (1997). “A refined ice/structure interaction model based on observations in the Gulf of Bothnia.” OMAE 97, Vol. IV, Yokohama, Japan, 373–376.
Guo, F. W., and Yue, Q. J. (2009). “Model test of ice-structure interaction.” Proc., 28th Int. Conf. Ocean, Offshore Arctic Eng., OMAE 2009-79780, Hawaii.
Izumiyama, K., and Uto, S. (1997). “Ice loading on a compliant indentor.” Proc., 14th Int. Conf. Port Ocean Eng. under Arctic Cond., Yokohama, Japan, Vol. 4, 431–436.
Kärnä, T. et al. (2003). “Tests on dynamic ice-structure interacion.” Proc., 22nd Int. Conf. Offshore Mech. Arctic Eng., OMAE 2003-37397, Cancun, Mexico.
Kärnä, T. et al. (2007). “An upper bound model for self-excited vibrations.” Proc., 19th Int. Conf. Port Ocean Eng. under Arctic Cond. (POAC 07), 177–189.
Kärnä, T., and Muohonen, A. (1990). “Preliminary results from ice indentation tests using flexible and rigid indentors.” Proc., 10th Int. Symp. on Ice, Vol. 3, Espoo, Finland, 261–275.
Kärnä, T., and Qu, Y. (2006). “Analysis of the size effect in ice crushing.” STRICE project report.
Kärnä, T., and Turunen, R. (1990). “A straightforward technique for analyzing structural response to dynamic ice action.” Proc., 9th Int. Conf. Offshore Mech. Arctic Eng., 135–142.
Määttänen, M. (1975). “Experiences of ice forces against a steel lighthouse mounted on the seabed, and proposed constructional refinements.” Proc., 3rd Int. Conf. Port Ocean Eng. under Arctic Cond. (POAC), Fairbanks, AK, Vol. II, 857–869.
Määttänen, M. (1978). “On conditions for the rise of self-excited ice-induced autonomous oscillations in slender marine pile structures. Winter navigation research board.” Research Rep. No. 25, Helsinki University of Technology, Helsinki, Finland.
Määttänen, M. (1987). “Ten years of ice induced vibration isolation in lighthouses.” Proc., 6th Int. Offshore Mech. Arctic Eng. Symp., Houston, TX, Vol. IV, 261–266.
Michel, B., and Toussaint, N. (1977). “Mechanics and theory of indentation of ice plates.” J. Glacial., 19(81), 285–300.
Palmer, A. C., Goodman, D. J., Ashby, M. F., Evans, A. G., Hutchinson, J. W., and Ponter, A. R.S. (1983). “Fracture and its role in determining ice forces on offshore structures.” Ann. Glacial., 4, 216–221.
Peyton, H. (1966). “Sea ice strength.” Report No UAG R-182, University of Alaska, Geophysical Institute.
Ralston, T. D. (1979). “Sea ice loads.” Technical seminar on Alaskan Beaufort Sea Gravel Islands.
Sanderson, T. J. O. (1988). Ice mechanics: Risks to offshore structures, Graham & Trotman, London, 156–157.
Sodhi (1988). “Ice induced vibrations of structures.” IAHR’88, Ice Symp., Sapporo, Japan, 625–657.
Sodhi, D. (1998). “Nonsimultaneous crushing during edge indentation of freshwater ice sheets.” Cold Reg. Sci. Technol.CRSTDL, 27(3), 179–195.
Sodhi, D. (2001). “Crushing failure during ice-structure interaction.” Eng. Fract. Mech.EFMEAH, 68(17–18), 1889–1921.
Timco, G. W., Irani, M. B., Tseng, J., Liu, L. K., and Zheng, C. B. (1992). “Model tests of dynamic ice loading on the Chinese JZ-20-2 jacket platform.” Can. J. Civ. Eng.CJCEB8, 19(5), 819–832.
Timoshenko, S., Young, D. H., and Weaver, W. (1974). Vibration problems in engineering, Wiley, New York, 110–113.
Toyama, Y., Sensu, T., Minami, M., and Yashima, N. (1983). “Model test on ice-induced self-excited vibration of cylindrical structures.” Proc., 7th Int. Conf. Port Ocean Eng. under Arctic Cond. (POAC’83), Espoo, Finland, Vol. 2, 834–844.
Yue, Q., Zhang, X., Bi, X., and Shi, Z. (2001). “Measurements and analysis of ice induced steady state vibration.” Proc., 16th Int. Conf. Port Ocean Eng. under Arctic Cond., Ottawa, Canada, 413–420.
Yue, Q. J., Bi, X., Zhang, X., and Karna, T. (2002). “Dynamic ice forces caused by crushing failure.” Proc., 16th Int. Symp. Ice., Dunedin, New Zealand, 134–141.
Yue, Q. J., Guo, F. W., and Kärnä, T. (2009). “Dynamic ice forces of slender vertical structures due to ice crushing.” Cold Reg. Sci. Technol.CRSTDL, 56(2–3), 77–83.
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© 2012. American Society of Civil Engineers.
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Received: Nov 23, 2010
Accepted: Dec 12, 2011
Published online: Dec 14, 2011
Published in print: Jul 1, 2012
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