A Scaled Model Design Method for an Ice-resistant Structure under Dynamic Ice Loads

MA Hongyang; LI Hui; JIA Ziyi

doi:10.7643/ issn.1672-9242.2025.11.008

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (11) : 78-84. DOI: 10.7643/ issn.1672-9242.2025.11.008

Ships and Marine Engineering Equipment

A Scaled Model Design Method for an Ice-resistant Structure under Dynamic Ice Loads

MA Hongyang, LI Hui^*, JIA Ziyi

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Abstract

The work aims to address the inconsistency of strain rate effects between the prototype and scaled models of ice-resistant structures under dynamic ice loads and develop a design method for scaled models of ice-resistant structures considering scale effects. By taking the stiffened plate, a basic unit of ice-resistant structures, as an example, and assuming that the scale effect of ice was not considered, the Cowper-Symonds constitutive model was used to account for the strain rate hardening effect of ice-resistant structures under dynamic loads and provide the stress relationship between the scaled model and the prototype. The collision forces when the prototype ice-resistant structure and the scaled model with arbitrary scaling ratios collided with ice at a certain speed were calculated respectively. The equivalent plastic strains at the center of the ice-resistant structure prototype and the scaled model were extracted respectively. By maintaining the similarity of strain rates between the prototype and the scaled model, the collision speed of the scaled model of the ice-resistant structure and the ice was given. The collision forces, equivalent plastic strains, and strain rates after the prototype ice-resistant structure and the scaled models with scaling ratios of 0.9, 0.8, and 0.2 collided with ice were calculated. The plastic region of the ice-resistant structure was concentrated in the range where it was in contact with the ice. The strain rates of each scaled model increased overall with the increase of the scaling ratio. The collision speed of the scaled model of the ice-resistant structure and the ice calculated by the method proposed was higher than that of the prototype. By comparing the collision forces before and after the collision between the scaled model of the ice-resistant structure and the ice, the differences in collision forces between the prototype and the scaled model could be effectively reduced after the speed was corrected, and the errors could all be controlled within 8%. Therefore, the bearing capacity of the prototype of the ice-resistant structure could be effectively predicted by conducting scaled model tests with the method proposed. There is a scale effect between the prototype and the scaled model of the ice-resistant structure. By using the method proposed to correct the collision speed, the problems of inconsistent stress states and strain rates caused by the scale effect can be effectively solved, thereby achieving the similarity of collision forces between the prototype and the scaled model of the ice-resistant structure.

Key words

ice-resistant structures / dynamic ice loads / scaled models / scale effects / strain rate / collision forces

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MA Hongyang, LI Hui, JIA Ziyi. A Scaled Model Design Method for an Ice-resistant Structure under Dynamic Ice Loads[J]. Equipment Environmental Engineering. 2025, 22(11): 78-84 https://doi.org/10.7643/ issn.1672-9242.2025.11.008

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