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Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-068
...<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...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-051
... of the conductor system. sea level resistance tube wall force conductor axial force quantity strength formula internal pressure effective axial force calculation offshore platform conductor interaction formula internal overpressure platform design true force cross sectional area subsea...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-067
... The estimation of ice force on offshore structures Is connected with the determination ice strength in front of the structure. The lee strength has to satisfy the strength criteria which correspond to the characteristic features of ice influence to the ice failure mechanizm and to the properties of sea ice...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-023
... 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...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-054
... 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...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-063
... 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...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-019
... 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 Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-025
...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...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-030
... 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 and tether system, references are made to Gaul and Pettersen (1989) and Hannus et. al. (1990). Conclusions are presented in section 4. bearing...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-022
...Pro<eedIn8' of the First (1990) Elilopean Offshore Mechamo SymposIum Trondhelm, Norway, 20-22 August 1990 CopYlIght © 1990 by The In/flnatlOnal Souery of Offshore and Polat Engineers ISBN 0-9626104-4-5 THE STATIC STRENGTH AND STIFFNESS OF MULTIPLANAR TUBULAR STEEL X-JOINTS G J van del' Vegte and J...
Proceedings Papers

Paper presented at the The First ISOPE European Offshore Mechanics Symposium, August 20–22, 1990
Paper Number: ISOPE-E-90-061
...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...

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