... characterization veritec calculation modification natural frequency heimdal flareboom heimdal chord stavanger ABSTRACT The Norwegian Petroleum Directorate recommend the structural damping ratio of welded individual members to be taken as 0.15% of critical damping when evaluating vortex induced...

... on the global resistance on the basis of the true local stresses. 1. INTRODUCTION The buckling calculation of a conductor involves certain problems which are not involved in the calculation of an ordinary beam-column. There are problems both with regard to the load and with regard to the resistance, even...

...PI OL eedlng , of the FII ,t (1990) EUlopean OffshOle Meehan SymposIUm TI ol1dheJm, NOI way, 20-22 August 1990 CopvlIght © 1990 hy The 1I1IeJnatlOnai Souety ofOjfshOle and PolO! Engll1eels ISBN 0-9626104-4-5 EFFICIENT METHODS FOR THE CALCULATION OF DYNAMIC MOORING LINE TENSION KJell Lw sen...

... Dept of elVll Engmeenng, Delft UmversIty of Technology Delft, The Netherlands ABSTRACT This paper presents a probability distribution of stress ranges and a spectral fatigue damage calculation of offshore structures subjected to nonnarrow banded Gaussian stress processes. The stress range probability...

... stress analysis, together with strain hmlts which are not well defined This leads to inconsistencies with pipeline steel specifications which include plasticity effects A constitutive model for pipeline steels IS Introduced which allows the calculation of stresses and strains for sigmficant design cases...

... is leading to the capability to predict the service lIfe of dynamic flexible risers. The motions and loads on flexible risers require knowledge of static mechanical properties of the pipe Wellstream has developed a family of simple and accurate methods for calculating static failure and stiffness properties...

... structures. Typical calculated results by this system are also presented being compared with field measurements and model test data as well as calculations by the other analysis programs. Through the comparative calculations the validity and flexible applicability of the system have been confirmed...

.... variation interaction strength equation adhesion structure building intensity ice strength granulated ice strength variation spray cone method air temperature calculation foundation ice building ice structure cross-section experimental result show upstream oil & gas P, oceedmgs...

... H LlU and C H Kln1 Texas A&M Umverslty College StatJon, Texas, USA x S Lu ShanghaI Jlao Tong Umverslty Shanghai, China ABSTRACT This paper presents the description of a higher- order boundary element method (HOBEM) for calculating linear hydrodynamic loadings on large floating bodies and comparison...

...PlOceedrng' of the FII ,t (1990) Ewopean Offshme MechanlL' SymposIum TlOndhefm, NO/way, 20-22 August 1990 COIf Ighl © 1990 "v The Inlel nalionol Souely of Offshm e and Pola! Engll1eels ISBN 0-9626104-4-5 ON THE MODELLING OF SHORT CRESTED SEA FOR STRUCTURAL RESPONSE CALCULATIONS Svene Havel StatOll...

... and wave forces, as well as the response from earthquakes is determined from the static space frame analysis. The platform was modelled in the same manner as for the dynamic response analysis. The final analysis was a series of calculations executed to obtain data on the longterm response distribution...

... that certainly are important, the problem is still quite complex involving environmental statistics and response calculation. In principle, lifetime extreme response must be found from long-term statistics of the response parameter of concern. It is, however, quite laborious to establish this kind of probability...

... known linear response characteristics, placed on or around a floating structure. A model of the sea state which retains information about the amplitude, phase and direction can then be used to calculate the resulting non-'linear drift forces by means of known quadratic transfer functions. It is shown...

... Standcng BMT FlUid MechanIcs Limited Teddmgton, U K ABSTRACT Sample calculations illustrate uncertainties in predicting second-order wave forces and low-frequency motions of a large moored structure. The results, for a 'deep-draught floater' in regular and irregular waves, demonstrate sensitivity...