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research-article

SCALE EFFECT IN ICE FLEXURAL STRENGTH

[+] Author and Article Information
Mohamed Aly

Memorial University of Newfoundland St. John's, NL, Canada, A1C 5S7
maly@mun.ca

Rocky S. Taylor

Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada A1B 3X5
rstaylor@mun.ca

Eleanor Bailey

C-CORE, Morrissey Road, St. John's, NL, Canada, A1B 3X5
eleanor.bailey@c-core.ca

Ian Turnbull

C-CORE, Morrissey Road, St. John's, NL, Canada, A1B 3X5
ian.turnbull@c-core.ca

1Corresponding author.

ASME doi:10.1115/1.4042388 History: Received September 13, 2018; Revised December 18, 2018

Abstract

Ice flexural strength is an important parameter in the assessment of ice loads on the hulls of ice-class ships, sloped offshore structures, and sloped bridge piers. While scale effects in compressive ice strength are well known, there has been debate as to whether or not scale effects in ice flexural strength exist. To investigate scale effects during flexural failure of both freshwater and saline ice, a comprehensive up-to-date database of beam flexural strength measurements has been compiled. The database includes 2073 freshwater ice beam tests with beam volumes between 0.00016 to 2.197 m3, and 2843 sea ice beam tests with volumes between 0.00048 to 59.87 m3. The data show a considerable decrease in flexural strength as the specimen size increases, when examined over a large range of scales. Empirical models of freshwater ice flexural strength as a function of beam volume, and of saline ice as function of beam and brine volumes have been developed using regression analysis. For freshwater ice, the scale-dependent flexural strength is given as: s_f=839(V/V_1 )^(-0.13). For sea ice, the dependence of flexural strength has been modeled as: s=?1324 ?(V/V_1 )?^(-0.054) e?^(-4.969 v(v_b )). Probabilistic models based on the empirical data were developed based on an analysis of the residuals, and can be used to enhance probabilistic calculations and Monte Carlo simulations for ice loads where ice flexural strength is an input.

Copyright (c) 2018 by ASME
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