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A C A D E M I C S P O N S O R S

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I N T E R N A T I O N A L C O M M I T T E E

PROFESSOR C CHRYSSOSTOMIDIS Massachusetts Inslitute of Technology PROFESSOR T MOAN University of Trondheim PROFESSOR P PRATT Imperial College of Science Technology and Medicine PROFESSOR J WOLTERS Technical University of Delft

N A T I O N A L O R G A N I S I N G C O M M I T T E E

PROFESSOR P HOLMES Imperial College of Science Technology and Medicine PROFESSOR M H PATEL University College London PROFESSOR P PRATT Imperial College of Science Technology and Medicine PROFESSOR R EATOCK TAYLOR University of Oxford

Managed on behalf of the Committee by Robert Gibbins -BOSS 92 Secretariat * BPP Technical Services Limited

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Archief

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BEHAVIOUR OF OFFSHORE

STRUCTURES

PROCEEDINGS OF T H E SIXTH INTERNATIONAL C O N F E R E N C E

1 9 9 2

VOLUME ONE

EDITED BY

MINOO H P A T E L

AND

R O B E R T GIBBINS

BPP T E C H N I C A L S E R V I C E S L T D LONDON

5

Proceedings ofthe Sixth International Conference on the behaviour of offshore structures, 7 -at Imperial College of Science, Technology and Medicine, London.

10 M y 1992 held

Secretariat

2 Tavistock Place London W C 1 H 9 R A Tel No: 071-837-6362 Fax No: 071-837-0822

Behaviour of Offshore Structures . Copyright (c) 1992 by BPP Technical Services Ltd. All rights reserved. No part of this publicaüon may be reproduced, stored in a retrieval system or distributed in any form or by any means without the pnor wntten permission of the publisher.

Bri t i sh L i b r a r y catalogue - in - Publication Data. A catalogue record for this book is

available from the Brit ish L i b r a r y .

I S B N 1 874612 00 5 Volume 1. (pblc)

ISBN 1 874612 02 1 Set of 2 volumes, (pbk)

6

Printed by Vail Printers Limited

London

CONTENTS

Committee and Sponsors Preface

Volume 1

SESSION A l - P L E N A R Y

PROGRESS THROUGH EVOLUTION R.H Bond

SESSION A2 - E V A L U A T I O N O F PREDICTIONS BV N U M E R I C A L H Y D R O D Y N A M I C ANALYSIS

A COMPARATIVE STUDY ON COMPUTED MOTION RESPONSE FOR FLOATING PRODUCnON PLATFORMS: DISCUSSION OF PRACTICAL PROCEDURES KHerfjord and F.G Nielsen

LOW FREQUENCY VERTICAL FORCES ACTING ON A SUBMERGED BODY: A COMPARISON BETWEEN THEORY AND EXPERIMENTS L Boudel. R Coinle and B Molin

SENSmVITY OF WAVE LOADS TO THE DISCRETIZATION OF BODIES JJ^ Newman and C.-H Lee

SESSION A3 - S T R U C T U R A L R E L I A B I L I T Y ANALYSIS

RECENT JAPANESE RESEARCH ACnVITEES ON STRUCTURAL R E L L S l B D J T Y OF SHIPS AND OFFSHORE STRUCTURES

S Machida, H Itagaki, T Oishi and K Ishikawa 5 7

RELLaLBILFTY ANALYSIS SYSTEM FOR OFFSHORE STOUCTURES-RASOS

J.T Gierlinski 5 LARGE ADMISSIBLE PERTUBATIONS APPROACH TO RÉLL\BILrTY: GLOBAL FAILURE EOUATIO^S FOR ELASTICyPLASTIC MATERLVL BEHAVIOUR E Beyko, M.M Bernilsas 5

SESSION A4 - FOUNDATION AND I N S T A L L A T I O N E N G I N E E R I N G

INNOVATTVE FOUNDATION SYSTEMS SELECTED FOR THE SNORRE FIELD DEVELOPMENT II.P Christophersen, S Bysveen and OJ Stove

ANALYSIS OF EXACT INSTALLATION OF A GRAVITY BASED STRUCTURE T Vinje, T Marthinsen and J.M Holwech

FOUNDATION BEHAVIOUR OFTHE FRIGG CDPl PLATFORM S Lacasse, L Robber stad, P Boisard and K Ohm

7

SESSION AS • T H E O C E A N ENVIRONMENT

COMBINED EDDY CURRENT/HURRICANE DESIGN CRITERIA FOR DBEPWATER GULF OF MEXICO STRUCTURES

KJ Schaudt. M W Spillam. V J Cardone 109

LARGE-SCALE VORTICES IN THE OCEAN AND UPWELLING

GS Triantafyllou and AA Dimas 121

ONTHE KINEMATICS OF LARGE OCEAN WAVES

P.H Taylor 134

WIND-WAVE DMTERACnONS

CSwan 146

DIRECnONAL DESIGN WAVE COMPUTATION - AN EWESTIG ATION

SSBhatA.B.UNayak.VSamUaimwandM.CDeo 158

SESSION A6 - S T R U C T U R A L R E L I A B I L I T Y APPLICATIONS

AGHNG OFFSHORE STRUCTURES. A REVIEW OF UK AND US RESEARCH

J.V Sharp. WJ Supple and CE Smith S UNCERTAINTIES ASSOCIATED WITH STRUCTURAL DESIGN OF RING STIFFENED TUBULAR X)INTS N Tahan. N.W Nichob, J.V Sharp and S.YA Ma S

CHARACTERISATION OF THE RESIDUAL STRENGTH OF STRUCTURES WTTH APPUC ATION TO RELIABILTTY ASSESSMENT J Gierlinski and E Yarimer

ANALYSIS OF TURRET MOORED STORAGE VESSEL FOR THE ALBA FIELD JP Laures and W.C de Boom

WAVE CROSS-CURRENT INTERACHON ON THE DRIFT FORCES OF A MOORED TANKER RM.M Huijsmans

A DISCRETE ELEMENT METHOD ON A CHAIN TURRET TANKER EXPOSED TO SURVIVAL CONDmONS A Dercksen and J.E.W Wickers

THE STATIC AND DYNAMIC ANALYSIS OF MOORED VESSELS IN IRREGULAR SEAS A .K Brook

THE DESIGN WAVE CONDmONS FOR DETERMINING WAVE DRIFF FORCES ON MOORED SHIPS AND SEMI-SUBMERSIBLES NS Miller and P.M Wilson

171

EFFICIENT REUABIUTY BASED DESIGN OF RING AND STRINGER STIFFENED CYLINDERS UNDER COMBINED LOADS P.K Das, D Faulkner and RA Zimmer 180

STRUCTURAL INTEGRITY ASSESSMENT AND U F E EXTENSION OF PLATFORMS IN AUSTRALIA AND SOUTH EAST ASIA

S French. J Seeto and P.G Dominish ^

SESSION A7 - T U R R E T MOORED F L O A T I N G PRODUCTION S Y S T E M S

EXTREME MOTIONS AND ANCHOR LINE LOADS INTURRETMOORING SYSTEMS I Fylling. CT Stansberg and K Mo 1^'

211

225

238

251

265

8

S E S S I O N B I - P L E N A R Y

F L U I D IJOADING R E S E A R C H - F U T U R E D I R E C T I O N S

T Sarpkaya 283

S E S S I O N B2 - L O A D I N G & R E S P O N S E O F C Y L I N D E R S - 1

L O A D I N G A N D R E S P O N S E O F A C I R C U U V R C Y L I N D E R I N O S C I L L A T O R Y F L O W A T C R m C A L R E Y N O L D S N U M B E R S

J.R Chaplin and VUM.R Lakkoju S

M E A S U R E M E N T A N D P R E D I C T I O N O F R E S P O N S E O F C I R C U L A R C Y L I N D E R S I N O S C I L L A T I N G F L O W P. W Bearman, X.W Lin and P.R Mackwood 29 7

R E S P O N S E O F A C I R C U L A R C Y L I N D E R I N R E G U L A R A N D R A N D O M O S C I L L A T O R Y F L O W A T K C = 10 A Slaouti and P.K Stansby 3{)g

S E S S I O N B3 - C O M P A R I S O N O F D E S I G N P R E D I C T I O N S W I T H F U L L S C A L E F O R F I X E D S T R U C T U R E S

E X T R E M E S T O R M L O A D I N G O N F D C E D O F F S H O R E P L A T F O R M S

P.S Tromans. J.W van de Graaf, M.Efthymiou, L Vanderschuren and P H Taylor 325

D Y N A M I C B E H A V I O U R O F D R I L L I N G D E R R I C K O N S T E E L J A C K E T P L A T F O R M : C O M P A R I S O N B E T W E E N N U M E R I C A L A N D E X P E R I M E N T A L R E S U L T S V Gusella, O Spadaccini and A Vignoli 337

M E A S U R E D J A C K - U P R E S P O N S E A N D S P U D C A N - S E A F L O O R I N T E R A C T I O N F O R A N E X T R E M E S T O R M E V E N T

W.O McCarron and M.D Broussard ^49

S E S S I O N B4 - C O M P A R I S O N O F D E S I G N P R E D I C T I O N S W I T H F U L L S C A L E A N D M O D E L S C A L E T E S T S

T H E B E N E F I T S A N D D I F H C U L T E S I N M E A S U R I N G O F F S H O R E V E H I C L E B E H A V I O U R GJ Lyons, A.D Walkins and D.T Brown ^65

E X T R E M E O F F S E T S O F COMPLIANT S T R U C T U R E S : E X P E R I M E N T A L NUMERICAL A N D THEOREnCAL R E S U L T S

M Dogliani, F Galeazzi an MJ Sterndorff 37g

P R O B A B I U S T I C A N A L Y S I S A N D I N T E R P R E T A T I O N O F W A V E L O A D I N G A N D R E S P O N S E O F T H E C B T C O M P L L \ N T C Y L I N D E R U N D E R R A N D O M W A V E S R Burrows, R.G Tickell and D Homes

388

I N T E R P R E T A T I O N OF BUOY M E A S U R E M E N T S I N DIRECnONAL S E A S A.E Mynetl, J Bosma and JA Keuning

9

S E S S I O N BS - L O A D I N G A N D R E S P O N S E O F C Y L I N D E R S - n

M E A S U R E M E N T S O F T H E H Y D R O D Y N A M I C D A M P I N G O F C I R C U L A R C Y L I N D E R S

PW Bearman and PH Mackwood

O N W A V E FORCE A N A L Y S I S U S I N G SYSTTEM IDENTinCATION

K Worden. P.K Stansby. G.R Tomlinson and SA Biltings

W A V E L O A D I N G O N A P A I R O F H O R I Z O N T A L C Y L I N D E R S

E Lambert and A Jamo-Druaux

T H E E F F E C T S O F W A V E S A N D M E A N F L O W O N T H E H Y D R O D Y N A M I C F O R C E S O N C I R C U I J \ R

C Y L I N D E R S R.H Arkell. JMJt Graham and C.Y.-Zhou

H Y D R O E L A S T I C R E S P O N S E A N A L Y S E S O F F L E X I B L E O F F S H O R E S T R U C T U R E S

H Kagemoto and T Waseda

S E S S I O N B6 - C O M P A R I S O N O F D E S I G N P R A C T I C E W T T H F U L L S C A L E F O R F I X E D

S T R U C T U R E S A N D T L P S

SPECTRAL FATIGUE A N A L Y S I S THEORY V E R S U S PRACnCE NM Fairweather. P.K Gorf. R£ Corr. R.O Snell and DJ Loader

VALIDATION OF " N E W W A V E T H E O R Y A N D RDWF PREDICTIONS A G A I N S T MEASURED G L O B A L LOADING ON A NORTH SEA JACKET 7" Elzinga and PS Tromans

APPLICATION OF TENSION LEG PLATFORM PERFORMANCE DATA E.R Jefferys. JA Mercier. S.C Bultema and PJi Erb

MEASURED A N D PREDICTED DYNAMIC BEHAVIOUR OF TOE GULLFAKS C G R A V T T Y PLATFORM ƒ Langen, E Skomedal and O Skjastad

STRUCTURAL RESPONSE A N D FATIGUE A N A L Y S I S OF A MONITORED PLATFORM O Spadaccini and S Biagini

S E S S I O N B7 - F O U N D A T I O N A N A L Y S I S T E C H N I Q U E

FOUNDATION WAVE LOAD TRANSFER FOR PLATFORMS ON RIB FOUNDATIONS HJLuger and P Meijers

OFFSHORE SKIRT PENETRATIW IN CLAY IN TOE GEOCENTRIFUGE A.GJ Hjortnaes-Pedersen and A Berauijen

A N IMPROVED CALCULATION METHOD FOR CONDUCTOR SETnNG DEPTHS I N SAND GJM Schotman and B Hospers

T H E BEHAVIOUR O F DISPLACEMENT P I L E S IN G L A C L \ L T I L L BM Lehane and RJ Jardine

10

SESSION C l - P L E N A R Y

OFRSHORE STRUCTURAL REUABIUTY ASSESSMENT - FROM RESEARCH TO REAUTY7 G Edwards and JJi Vugts S

SESSION C2 - TENSION L E G P L A T F O R M DYNAMICS

NON-UNEAR HYDRODYNAMIC ANALYSIS OFTLPS IN EXTREME WAVES: SLENDER BODY AND DIFFRACnON THEORIES COMPARED R Eaiock Taylor, R.C.T Rainey and DM Dai 5 69

EXPERIMENTAL MEASUREMENT OF SBCONIW)RDER SUM-FREQUENCY OSCILLATIONS OF ATENSION-LEG PLATFORM T Matsui. Y Sakoh and T Nozu 584

COMPARATIVE EVALUATION OFTENSIONED L E G PIATFORMS WTTH REDUCED TETHER TENSION MMPaielandHIfark 599

SESSION C3 - S T R U C T U R A L I N S P E C T I O N

INSERVICE INSPECTION PLANNING FOR STEEL OFFSHORE STRUCTURES USEMG REUABIUTY METHODS

I Lotsberg and M J Mar ley 517

REUABIUTY BASED INSPECnON PLANNING

H Carstens, C Eilersen and H O Madsen S

A BAYESLW INSPECnON PROCEDURE APPUED TO OFFSHORE STEEL PLATFORMS

J J Jensen and PT Pedersen 529

ACFM INSPECTION OF OFFSHORE STRUCTURES

W.D Dover, JJi Rudlin. C Monahan and M Lugg 643

SESSION C4 - COMPARISON O F DESIGN PREDICTIONS W I T H F U L L S C A L E FOR FOUNDATIONS

CORRELATION OFTHE RESULTS FROM FIELD EXPERIMENTS WTTH D^STRUMENTED MODEL PILES DM LONDON CLAY AND LABORATORY RING SHEAR INTERFACETESTS T.E Tika-Vassilikos. AJ Bond and RJ Jardine 1 INSTRUMENTATION OFTHE SKIRT PILED GULLFAKS C GRAVTH' PLATTORM FOR PERKDRMANCE MONTTORING F Myrvoll ^.^^ INSTRUMENTATION FOR MONITORING THE INSTALLATION AND PERFORMANCE OF THE CONCRETE FOUNDATIWJTEMPLATES FOR THE SNORRETENSION LEG PLATFORM R Jonsrud and G Finnesand

690

OBSERVATIONS ON DRAINAGE CONTROL EFFECTS ON GULUAKS CGRAVTTY STRUCTURE Tor IngeTjeha.N Janbu and L Grande 704

11

Volume 2

THE DESIGN OFTHE INSTALLATION AND OFFSHORE COMPLEHON OF THE EKOFISK PROTECnVE

BARRIER HAJde Ridder

733

744

SESSION C9 • MATERIALS TECHNOLOGY

HIGH PERFORMANCE COMPOSITE TUBES FOR DEEPWATER RISERS C Sparks, P Odru, M Auberon amd G Metivaud '23

BUCKLING BEHAVIOUR OF COMPOSITE GFRP CYLINDRICAL PANELS UNDER AXIAL COMPRESSION M K Chryssaruhopoulos, K D Kim and P J Dowling

UNDERSTANDING BRITTLE SHEAR FAILURE IN CONCRETE OFFSHORE STRUCTURES J Blaauwendraad and Z Ping Wu

SESSION CS - VORTEX INDUCED VIBRATIONS

HYDRODYNAMICS OF LARGE AMPLTTUDE CABLE VIBRATIONS IN CURRENTS W.W Massie, JA Battjes, M.W Dijkman and VM Thumann '59

THE SIGNIHCANCE OF WATER DEPTH OF VORTEX INDUCED VIBRATIONS OF MARINE RISERS

J Fang and GJ Lyons

THE INTRODUCTION OF A SECOND PHASE AS A MEAN OF REDUCING VORTEX EDUCED VIBRATIONS

A Moros and C Swan

THE USE OF HELICAL STRAKES TO SUPPRESS VORTEX INDUCED VIBRATION GS Jones and WS Lamb

SHIELDING AND BLOCKAGE MODEL FOR OFFSHORE PLATFORMS K.F Lambrakos and H Beckmann

SESSION C6 - STRUCTURAL ANALYSIS AND FATIGUE OF FIXED PLATFORMS

DESIGN IMPUCATIONS FOR NEW DRAFT FATIGUE GUIDANCE FOR TUBULAR JOINTS: CASE STUDIES

R Nataraja, D Loader, J.V Sharp and N.W Nichols

A METHODOLOGY FOR THE ASSESSMENT OF FATIGUE CRACKS IN OFFSHORE JACKET STRUCTURES

/ Haswell and R Murray

LOAD FACTOR CALIBRATION FOR THE GULF OF GUINEA ADAPTATION OF API RP2A-LRFD

M Birades, C A Cornell and B Ledoigt

776

791

804

836

S

851

866

LIMIT STATE CODE CHECKING OF OFFSHORE CONCRETE STRUCTURES MJ Bailey. N.F.O Evbuomwan, NDJ' Barlirop and T.Hodgson

892

12

SESSION C7 - S H E L L T R O L L P L A T F O R M FOUNDATION ANALYSIS

SOIL PARAMETERS FOR FOUNDATION DESIGN, TROLL PLATFORM T By and E Skomedal

FOUNDATION DESIGN, TROLL PLATFORM

B Hansen, F Nowacki, E Skomedal and J Hermstad 921

CLAYBEHAVIOUR UNDER IRREGULAR C Y C U C LOADING

K.H Andersen, R Dyvik, Y Kikuchi and E Skomedal 937

EFFECTIVE STRESS CONCEPT FOR DYNAMIC STIFFNESS OF CLAY

G Svano, H Lango. C Madshus and E Skomedal 95 j

EXTREME DYNAMIC RESPONSEOFTHETROLLGRAVTTYPLATFORM

D Karunakaran. BJLeira, O Skjastad and E Skomedal 959 SESSION C8 - J A C K - UP DESIGN ANALYSIS

JACK-UP SPUDCAN SUDING/BEARING RESISTANCE ON SAND E.C Hambly

ELEVATED JACK-UP MODEUNÜ

PLiu, W.W Massie, J.G Wolters and J Blaauwendraad jqO]

P I S T T O R J S " ^ ' ^ ^ ^ ' ^ ^ ^ ^ ^ ^ ^ ^ ^̂ ^̂ D Karunakaran, BJLeira, N.Spidsoe. O.TGudmestad and T Moan 1015

SESSION DI - P L E N A R Y

mSTORICALOVERVlEW OF GEOTECHNICAL DESIGN IN THE NORTH SEA Tor Inge Tjelta ^^^^

GEOTECHNICAL DESIGN AND ENGINEERING FOR THE 90'S F.E. Toolan

S

SESSION D2 - L O W F R E Q U E N C Y DAMPING

WAVE DRIFT DAMPING OF A TURRET MOORED SHIP

V Aanesland, K.E Kaasen and J.R Krokstad j ̂ ^ j

LgmiEQUENCY DAMPING P R E D I C ^ ^ ^

G£ Hearn and P Goodwin 1066

OSïi?lL°S!ïSSS^''''^°'''''^'^'^™^^ A Nestegird and T Vada

1082

13

SESSION D3 - DYNAMIC RESPONSE O F F L O A T I N G S T R U C T U R E S

EXPERIMENTAL AND THEOREnCAL INVESTIGATION INTO THE ROLL DAMPING OF A SYSTEMATIC SERIES OFTWO DIMENSIONAL BARGE SECTIONS R.G Standing . G.E Jackson andAK Brook

D4FLUENCE OF LOAD MOTION CONTROL ON THE OPERATIONAL UMITATIONS OF l A R G E CRANE VESSELS IN SEVERE ENVIRCM>nvIENT G.F Clauss and T Riekert

DYNAMIC RESPONSE OF A MULTI HINGE ARTICULATED TOWER COUPLEDTO A SHIP T.K Thomas and C Ganapalhy

SESSION D4 - S A F E T Y ISSUES

1112

1126

STRUCTURAL CONSEQUENCE ANALYSIS FOR QRA G Home and D Harrison

MANAGING RISK ASSESSMENT FOR THE TIFFANY PLATFORM STRUCTURE J Kennedy, P Linzi, P Dennis

BLAST RESISTANT RETROFTT OF AN OFFSHORE MODULE: AN OVERVIEW JA Alexander and JA Jones

1143

S E S S I O N DS - W A V E D R I F T B E H A V I O U R

W A V E D R I F T F O R C E S I N S H A L L O W W A T E R j ^ ^ ^

JA Pinkster and RJiM Huijsmans

SLOWLY VARYING DRIFT FORCES I N DIRECnONAL WAVES ^^^^

YInoueandW.YXue

L O N G D U R A T I O N M O D E L T E S T S F O R L O W F R E Q U E N C Y B E H A V I O U R O F F L O A T I N G O F F S H O R E

S T R O C T U R E S I N L O N G A N D S H O R T C R E S T E D W A V E S ^ ^ ^ ^

MJ Sterndorff and J Skourup

M O D E L S C A L E E X P E R I M E N T S O N E X T R E M E S L O W D R I F T M O T I O N S DM I R R E G U L A R W A V E S

CT Stansberg

T H E S L O W D R I F T R E S P O N S E O F M U L T I L E G S T R U C T U R E S I N I R R E G U L A R A N D R A N D O M W A V E S

PD Sclavounos arui OJ Emmerhoff

M E A N Y A W M O M E N T O N F L O A T I N G B O D I E S A D V A N C I N G W T T H A F O R W A R D S P E E D DM W A V E S

J Grue and E Palm

1207

1223

1238

SESSION D6 - HYDRODYNAMICS AND S T R U C T U R A L M E C H A N I C S O F F L E X I B L E PIPES

DESIGN METHODS FOR FLEXIBLE RISERS J253 CJA Larsen, BJ Leira, A Olufsen and N Sfidahl

LOOP FORMATION OF MARINE CABLES AND UMBIUCALS DURDJG mST ALLATTON ^^^^

Z Tan and J A Witz

DAMPDMG AND HYSTERESIS EFFECTS ON THE BEHAVIOUR OF FLEXIBLE RISERS ^

G de Boer and HJ van den Boom

A STUDY OF THE BEHAVIOUR OF A LONG AND FLEXIBLE PIPE Dl THE WATER ^

M Ohkusu

14

SESSION D7 - L I Q U I F I C A T I O N AND SCOUR

PULL-OUT CAPACITY ANALYSES OF SUCnON ANCHORS FOR TENSION LEG PLATFORMS KM Andersen, R Dyvik and K Schroder

BAYESLW UPDATING OF SETTLEMENT PREDICTION AH Tan and FNadim

UQUfflCATION OFTRENCH FILL AROUND A PIPELINE IN THE SEABED M.B de Groot and P Meijers

LOCAL SCOUR NEAR SUBMARINE PIPELINES ON A COHESIVE BCmDM ETJM Pluim - van der Velden, E W Bijker

EFFECT OF C Y C U C PRESTRAINING ON THE UQUIHCATION OF SAND S Teachavorasinskun, F Tatsuoka, K Kenkyo and K Yasuhara

* S signifies paper contained in supplementary volume