Download - API_RP_2A_21st 2000 vs 2007 - Joint Only
-
ComparisonsonAPIRP2A WSD21st edition
2000Publicationvs.2007Publication
StrengthofTubularJoints
6/24/2010 1EngineeringDynamics,Inc
All right reserved. No part of this document may be reproduced in any form without prior written permission of Engineering Dynamics, Inc.
-
OverviewTheold(wewillcallitAPI2000):
APIRP2A WSD21st edition2000Publication
Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms Working Stress Design
Upstream Segment
API RECOMMENDED PRACTICE 2A-WSD (RP 2A-WSD)
TWENTY-FIRST EDITION, DECEMEBER 2000
Andthelatest(wewillcallitAPI2007):
APIRP2A WSD21st edition2007Publication(API2007)
Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms Working Stress Design
Upstream Segment
API RECOMMENDED PRACTICE 2A-WSD (RP 2A-WSD)TWENTY-FIRST EDITION, DECEMEBER 2000ERRATA AND SUPPLEMENT 1, DECEMBER 2002ERRATA AND SUPPLEMENT 2, SEMPTEMBER 2005ERRATA AND SUPPLEMENT 3, AUGUST 2007
6/24/2010 2EngineeringDynamics,Inc
-
Conclusions1. Thelatest.ThenewAPIRP2A WSD21st editionwithErrataand
Supplement1,2an3hasmadewiderangingchangesontubularconnections,fatigueandfoundationsoverthe2000publication.ThenewcodeshouldbeusediftheAPIRP2A WSD21st editionisselectedasdesigncode.
2. Onestopsolution,nointerfacehandling.Basedon35+yearsexperienceinsupplyingoffshorestructuresoftwaresystem,EDIistheleadingsoftwarecompanywithintegratedgraphicsmodeling,preprocessing,solvingandgraphicspostprocessingcapabilities.
3. Demandthebest.Fullyimplementedinpostprocessor,jointcanandfatigueprogramsinSACS5.3release,thenewAPIRP2A WSD21st editionwithErrataandSupplement1,2and3isnowanessentialpartinthe mostcomprehensiveoffshorepackageintheworld.
6/24/2010 3EngineeringDynamics,Inc
-
StrengthofTubularJointsCodeContents
API20004 Connections4.1 Connections of Tension and Compression
Members4.2 Restraint and Shrinkage4.3 Tubular Joints
API20074 Strength of Tubular Joints4.1 Application4.2 Design Considerations4.3 Simple Joints4.4 Overlapping Joints4.5 Grouted Joints4.6 Internally Ring-stiffened Joints4.7 Cast Joints4.8 Other Circular Joint Types4.9 Damaged Joints4.10 Non-circular Joints
6/24/2010 4EngineeringDynamics,Inc
-
Fact:
Lastmajorupdatetojointstrengthprovisionswas14th edition.Theguidanceessentiallyremainedunchangedforalleditionsupto21st.
StrengthofTubularJointsBackground
6/24/2010 5EngineeringDynamics,Inc
-
Fact:Muchfurtherknowledge,includingbothexperimentaldataandnumericalstudies,hasbeengainedonthebehaviorofjointssince14th editionissued.Overtheperiod1994to1996MSLengineering,undertheauspicesofajointindustryproject,undertookanupdatetothetubularjointdatabaseandguidance.Thisworkhadmorerecentstudies,notablybyAPI/EWIandtheUniversityofIllinois,haveformedthebasisofthetubularjointstrengthprovisionsofISO.
StrengthofTubularJointsBackground
6/24/2010 6EngineeringDynamics,Inc
-
Fact:
TheISOdraftingcommitteetook,asastartingpointfordrafting,therelevantprovisionsfromAPIRP2ALRFD1st edition(similartoAPIRP2AWSD20th edition)becauseISOisinLRFDformat.Forthepurposeofthesupplementtothe21st
editionofAPIRP2A,thedraftISOprovisions,inturn,havebeenusedasastartingbasis.
StrengthofTubularJointsBackground
6/24/2010 7EngineeringDynamics,Inc
-
StrengthofTubularJointsMajorUpdate
API2007
6/24/2010 EngineeringDynamics,Inc 8
Minimum Capacity Check Revised
API2000
InwhichPaiscalculatedasfollowswithFS=1.0
InSACSprogramthefollowingequationisused:
-
API2000
SF=1.7CorrespondedtoanLRFDresistancefactorof0.95.
StrengthofTubularJointsMajorUpdate
SafetyFactorRecalibrated
API2007
SF=1.6CorrespondedtoanLRFDresistancefactorof1.0
6/24/2010 9EngineeringDynamics,Inc
-
API2000
Section4.1
Fyc theyieldstrengthofthechordmemberatthejoint(or2/3ofthetensilestrengthifless)
StrengthofTubularJointsMajorUpdate
The2/3limitsontensilestrengthrelaxed
API2007
Section4.2.1
Thevalueofyieldstressforthechord,inthecalculationofjointcapacity,shouldbelimitedto0.8timesthetensilestrengthofthechord formaterialswithayieldstressof72ksi(500MPa)orless.
6/24/2010 10EngineeringDynamics,Inc
-
API2000
StrengthofTubularJointsMajorUpdate
Additionalguidanceondetailingpractice
6/24/2010 11EngineeringDynamics,Inc
-
StrengthofTubularJointsMajorUpdate
Additionalguidanceondetailingpractice continued
API20076/24/2010 12EngineeringDynamics,Inc
-
API2000Theadequacyofthejointmaybe
determinedonthebasisof(a)punchingshearor(b)nominalloadsinthebrace.
StrengthofTubularJointsMajorUpdate
Punchingshearapproachremoved
API2007Thejointinteractionratio,IR,foraxial
loadsand/orbendingmomentsinthebraceshouldbecalculatedusingthefollowingexpression,
6/24/2010 13EngineeringDynamics,Inc
-
API2000
StrengthofTubularJointsMajorUpdate
NewStrengthfactorQu formulations
API2007
6/24/2010 14EngineeringDynamics,Inc
-
API2000
StrengthofTubularJointsMajorUpdate
NewchordloadfactorQf formulations
API2007
6/24/2010 15EngineeringDynamics,Inc
-
API2000N/A
StrengthofTubularJointsMajorUpdate
StrengthforaxiallyloadedYandXjointswithshortcanlengthsreduced
API2007Forsimple,axiallyloadedYandXjointswherea
thickenedjointcanisspecified,thejointallowablecapacitymaybecalculatedasfollows,
6/24/2010 16EngineeringDynamics,Inc
-
API2000
Fullyimplemented
StrengthofTubularJointsMajorUpdate
ImplementationintoSACSjointcanprogram
API2007
Fullyimplemented
6/24/2010 17EngineeringDynamics,Inc
-
SimpleTjoint:
Brace34:16x0.375 5.0ft
Chord13&32:24x0.375 8.25ft
Can:24x0.625 1.75ft
AllFy =36ksi
Loadatbracejoint4:Fx=10.0kip
Fy=7.5kip
Fz=50.0kip
Loadatconnectingjoint3:
Fx=400.0kip
Fy=50.0kip
StrengthofTubularJointsExample
MemberLengthshowninft
6/24/2010 18EngineeringDynamics,Inc
-
API2000 Punchingshearjointcheckwithfinalunitycheckratio=0.974
* * J O I N T C A N D E T A I L R E P O R T * *(JOINT ORDER)
CHORD * ACTING STRESSES * *** PUNCHING SHEAR ***COMMON CHORD BRACE ****** CHORD ***** JOINT GAP *** BRACE ** BRACE LOAD *CHORD** BRACE * ALLOWABLE STRESSES UNITYJOINT JOINT JOINT O.D. WT FY TYPE O.D. WT ANGLE CASE SRSS FA OPB IPB FA OPB IPB CHECK
(IN) (IN) (KSI) (IN) (IN) (IN) (DEG) (KSI) (KSI) (KSI) (KSI) (KSI) (KSI) (KSI)3 1 4 24.00 0.625 36.0 T 16.00 0.375 90.00 1 11.51 -1.63 3.84 5.12 3.66 6.65 11.15 0.974
StrengthofTubularJointsExampleResultsCompared
API2007 Braceloadsinteractioncheckwithfinalunitycheckratio=1.168
* * J O I N T C A N D E T A I L R E P O R T * *(UNITY CHECK ORDER)
EFFT. CHORD * ACTING STRESSES * *** PUNCHING SHEAR ***COMM CHRD BRCE ****** CHORD **** CHORD JNT GAP *** BRACE ** BRACE LOAD *CHORD** BRACE * ALLOWABLE STRESSES UNITYJNT JNT JNT O.D. WT FY LNGTH TYP O.D. WT ANGLE CASE STRESS FA OPB IPB FA OPB IPB CHECK
IN IN KSI FT IN IN IN DEG KSI KSI KSI KSI KSI KSI KSI 3 1 4 24.00 0.625 36.0 3.5 T 16.00 0.375 90.00 1 -11.51 -2.72 6.40 8.54 7.20 10.16 21.30 1.168
JointCanLength
6/24/2010 19EngineeringDynamics,Inc