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Träfflista för sökning "LAR1:ltu srt2:(1980-1989);srt2:(1985);pers:(Fransson Lennart)"

Sökning: LAR1:ltu > (1980-1989) > (1985) > Fransson Lennart

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1.
  • Fransson, Lennart, et al. (författare)
  • Brash ice shear properties : laboratory tests
  • 1985
  • Ingår i: POAC 85. - Hørsholm : Dansk hydraulisk institut. - 8798195018
  • Konferensbidrag (refereegranskat)abstract
    • According to earlier studies of brash ice covered channels and problems connected with winter navigation laboratory tests have been performed, treating brash ice as a Mohr-Coulomb material cohesion and shear properties have been studied. A shear box, 0. 5 multiplied by 0. 5 m, equipped with a water bag for normal loading, was used. The force required to shear the rubble was determined as a function of normal force, shear rate and ice piece thickness. The test results are analyzed and presented. The results are also compared with results from other studies and the applicability is discussed
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3.
  • Fransson, Lennart (författare)
  • Load bearing capacity of an ice cover subjected to concentrated loads
  • 1985
  • Ingår i: Proceedings of the Fourth International Offshore Mechanics and Arctic Engineering Symposium. - New York : American Society of Mechanical Engineers. ; , s. 170-176
  • Konferensbidrag (refereegranskat)abstract
    • This work presents theoretical and field investigations of the bearing capacity of floating ice covers subjected to concentrated loads. The field tests were performed in the Gulf of Bothnia on columnar sea-ice with low salinity and with a thickness of 0. 4-0. 8 m. Thick plates with vertical anisotropy such as the tested ice covers have shown large local shear deformations and nonlinear creep. An empirical model is presented for the prediction of deflections based on curve fitting where these facts are taken into account. A modified strain-energy criteria or a local puncing are assumed to govern the failure. The failure load as a function of ice thickness and loading rate is plotted for a certain ice type. The bearing capacity of reinforced ice covers is compared with natural ice and the effect of different reinforcements such as wooden bars is discussed
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