...<hamcs Symposium TlOndhelm. NOIway. 20-22 August 1990 CopYllght © 1990 by The Intel natIOnal Souely ofOffshOle and Polar Englneels ISBN 0-9626104-4-5 MULTIAXIAL CREEP OF SALINE ICE A I Goillbol'. V N Ra:beglll. and ME SlepaA Research Institute of Bases and Underground Structures Moscow, USSR ABSTRACT The creep behaviour and strength of ice under the multiaxial loading conditions are discussed in the paper basing on the results of laboratory experiments with an artificial saline ice. Possible modifications of mathe- matical models early proposed by the authors are investigated in order to take into acco- unt the regularities of multiaxial tests. INTRODUCTION Ice-to-structure interaction is one of the key problems which should be carefully investigated for offshore structures success- ful designing and operating in Arctic regions and also in all regions where sea ice cover, floes, icebergs or ground ice can exist. It is well-known for most realistic situ~' a tions in engineering practice that the com- plex, multiaxial stress-strain state arises in ice under the interaction, affecting strongly the contact loads and ctisplacements e g., when an ice floe s trike the leg of structure or when a structure foundation ba- ses on the ice layer. Nevertheless, most of experimental data concern the simplest loa- ding geometry (uniaxial compression-tension, shear and bending tests). Up to now, only few work is known presenting original test re- sults of multiaxial ice behaviour, mainly of fresh-water ice: Rigsby (1958); Haefeli et ale (1968); Hausler (1981); Jones (1982,1983); Richter-Menge et ale (1986); Timco and Freder- king (1983). In this paper, strength and creep proper~ ties of an artificial saline ice are investi- gated by the device of stabilometric type pro- viding the uniform stress state 5; > 52 = 0; through the samples ( ~ denote the principal stress vector components). The main goal is to estimate the effect of hydrostatic pressu- re on both quasi-instantaneous and long-term strength, as well as on the shear and volume 556 creep strains development and also to find a suitable...

... no. n. Cm Moment factor in the interaction formula of ref. [13). Dl Outer diameter of tube no. 1. DJ Outer diameter of tube no. j. N 424 Modulus of elasticity of steel. Eccentricity of tube no. j. Yield strength. "Reduced" yield strength. Buckling stress in ref. [12). The acceleration of gravity. Max...

...-of-plane braces on the behaviour of statically loaded X-joints under axial load, bending in-plane or bending out-of plane. A clear multiplanar effect is observed for stiffness, strength and deformation capacity of multiplanar X-joints in comparison to uniplanar Xjoints. Finally, the test results...

...P/Ouedlngs of the FlIst (1990) Eu/Opean OjfshOle Me(ham(s SymposIum Ttondhelm, Norway, 20-22 August 1990 Copyllght © 1990 by The 1nlernatlOnai Souety ofOjfshOle and Polm Engtneels ISBN 0-96261044-5 THE STRENGTH OF COMPOSITE ICE-RESISTING WALLS SUBJECTED TO COMBINED LOADS M J Stephen I and T , E...

... shear stress zanegin friction coulomb-mohr criterion proc dependence shear strength upstream oil &amp; gas normal stress internal friction strength estimation poly technical institute plane criterion normal force sea ice cohesion P/Oceedmgs a/the Fllst (/990) EUlopean O!fshme...

... to fatIgue behaviour of steel offshore structures. TheoretIcal and experImental investigations are conducted on unstlffened and stiffened steel tubular JOInts to assess stress concentratlOn and statlc strength, and study the effect of lnternal rIng stIffeners. The results of the theoretIcal and experimental...

... of serVIce lIfe of dynamIC risers. PART I - STATIC PROPERTIES Calculations of motlOns and loadmgs in dynamIC fleXIble nsers requires prior calculation of static strength and stIffness properties of the pipes. A series of static properties calculatIOn methods has been developed (Ollveira, Gots & Okamodo, 1985...

... ABSTRACT Two main varieties of ice strength change are considered: the first one - variation at purposeful strengthening methods affecting ice by using certain cooling facilities and the second one - strength variation under natural conditions at the ice contact with engineering structures...

... of local denting of unstiffened cylindrical shells developed by Wierzbicki and Sub (1987), to ring stiffened shells. Observations show that while the ring stiffeners increase the strength of the shell, they may cause premature fracture in the case of extreme loads. The fracture process is driven...

...Proceedings of the Fllst (1990) European Offshore Mechanics SymposIum Trondhelm, NO/way, 20-22 August 1990 CopYright © 1990 by The InternatIOnal SOCIety ofOffshOle and Polar Engtneels ISBN 0-9626/04-4-5 HIGH STRENGTH WELDABLE FORGED STEEL FOR TENSION LEG PLATFORM TETHER SYSTEMS T Fukuda and T Abe...

... of the Snorre CLB radial bearing and conduit seal. The test programs were designed to provide the necessary data to validate 245 essential functional and strength aspects of the designs. Design data of the two elastomer components are presented in paragraphs below. For descriptions of the Snorre TLP platform...