Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/12006
Title: Working Group on Ice Forces on Structures : a state-of-the-art-report
Authors: International Association for Hydraulic Research
International Association for Hydraulic Research. Section on Ice Problems. Working Group on Ice Forces on Structures
Carstens, Torkild Johan, 1931-
Keywords: Force (mechanics)
Ice pressure
Ice loads
Hydraulic structures
Dams
Floating ice
Ice wedges
Ice sheets
Ice
Sea ice
Structures
Underwater structures
Waterfront structures
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 80-26.
Description: Special Report
Abstract: Part I. A short review is presented of the literature on thermal ice pressure against extended hydraulic structures such as dams. Some of the methods suggested for the computation of ice loads caused by temperature changes are reviewed. As a means of comparison measurements of thermal ice pressure and empirical values used at present for estimating these loads are referred to. Part II. Ice forces on structures are determined either by the environmental driving force or by the force to fail the ice sheet and move the ice around the structure; which ever is the least. State-of-the-art techniques for predicting these forces on fixed, rigid structures are presented. A rigid structure is defined as one where the ice interaction process is not influenced by the deformation of the structure itself. Structures are considered in three broad categories; structures with sloping sides, structures with vertical sides, and wide structures such as artificial islands. Both uniform and ridged ice is considered. The problem of ice ride-up on sloping beaches is also discussed. Part III. The modes of interaction between ice and structure are discussed, and the properties of both ice and structure are seen in the context of interaction. The key parameter of the ice is the dependence of crushing strength on loading rate, in particular the inverse relationship that exists for a certain range and gives rise to negative damping. Self-excited vibrations leading to limit cycles are explained and some design problems are discussed. Part IV. A review of the buckling analyses of floating ice sheets is presented. The theory used is that of a beam or plate on an elastic foundation. For beams, the results for all possible boundary conditions are presented and discussed. For plates, results of numerical solutions for a semi-infinite plate loaded over a part of its boundary are presented and discussed. One solution is presented for an infinite plate loaded radially at a hole in the plate. In addition, results for wedge-shaped beams and plates are presented and discussed. Wedge-shaped ice sheets frequently occur due to previous cracking in the ice.
Rights: Approved for public release; distribution is unlimited.
URI: http://hdl.handle.net/11681/12006
Appears in Collections:Special Report

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