Ice Load Prediction with the Use of a Rate-Dependent Anisotropic Constitutive Law

by Vitoon Vivatrat, Brian Watt Associates Inc, Houston, TX, USA,
Victor L. Chen, Brian Watt Associates Inc, Houston, TX, USA,



Document Type: Proceeding Paper

Part of: Civil Engineering in the Arctic Offshore

Abstract:

Man-made structures built in arctic offshore areas are subject to ice loads. Traditional methods for estimating ice loads rely on an indentation factor from rigid-plasticity, an empirical expression for the 'equivalent' strain-rate, and an empirical contact factor. Experimental results show that the ice behavior is rate-dependent and anisotropic. To accurately represent this behavior, the pointwise variation in the strain-rate must be taken into account. An anisotropic creep law for ice is introduced and various possible methods for ice load prediction are based on this law. Solutions are presented for the Upper Bound Method. Potential applications to field ice load problems are discussed.

Subject Headings: Ice loads | Offshore structures | Anisotropy | Constitutive relations | Strain rates | Load factors | Structural design | Arctic

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