April 2010 - the death of British .April 2010 –the death of British Standards Dr Andrew Bond ... – BS 6399 Loading for buildings ... (as in BSs 5400 and 5950)

  • View
    215

  • Download
    0

Embed Size (px)

Text of April 2010 - the death of British .April 2010 –the death of British Standards Dr...

  • 1

    April2010 thedeathofBritishStandards

    DrAndrewBond(Geocentrix)

    Outlineoftalk

    WhathappensinApril2010? Whatwelose Whatwegain Technicaldifferences(structural) Technicaldifferences(geotechnical) Whathelpisthere? Conclusion

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 2

  • 2

    WhathappensinApril2010?

    April2010 thedeathofBritishSt d dStandards

    Eurocodes arecoming.Areyouready?

    TheEurocodes andtheirNationalAnnexeswillreplaceexistingBritishStandardsinMarch2010.Theirusewill

    bemandatoryforallpublicbuildingsandrecommendedforprivatebuildingsfromthisdate

    IntroductiontoBSIsconferenceonPreparingforEurocodes managingthechange

    October2009

    AccordingtoaBSIsurveyinJune2009:over30%oftheconstructionsectorarealreadyusingEurocodes

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 4

  • 3

    HighwaysAgencyEurocodes strategy

    TheuseofcurrentNationalStandardswillti t b itt d til BSI ithdcontinuetobepermitteduntilBSIwithdraws

    them.OncewithdrawntheAgencywillspecifythathighwaystructuresshallonlybedesignedinaccordancewithEurocodes

    www.highways.gov.uk/business/1198.aspx

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 5

    Whatwelose

    April2010 thedeathofBritishSt d dStandards

  • 4

    ListofBritishStandardsthataretobewithdrawnon31st March2010

    Loads BS6399Loadingforbuildings(parts13)

    Concrete BS8110Structuraluseofconcrete(parts13) BS8007(CP)Designofconcretestructuresforretaining

    aqueousliquids Steel

    BS5950Structuraluseofsteelworkinbuilding(parts19) BS 4492 Specification for the use of structural steel in buildingBS449 2Specificationfortheuseofstructuralsteelinbuilding BS4604Specificationfortheuseofhighstrengthgripboltsin

    structuralsteelwork(parts12) BS7608(CP)Fatiguedesignandassessmentofsteelstructure

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 7

    ListofBritishStandardsthataretobewithdrawnon31st March2010

    Timber BS5268Structuraluseoftimber(parts27)

    Masonry BS5628(CP)Useofmasonry(parts13) BS80003Workmanshiponbuildingsites.(CP)Masonry

    Aluminium BS8118Structuraluseofaluminium(parts12)

    BridgesBS 5400 Steel composite and concrete bridges (parts 1 10) BS5400Steel,compositeandconcretebridges(parts110)

    Towers,mastsandchimneys BS8100Lattice,towersandmasts(parts14) BS4076Specificationforsteelchimneys

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 8

  • 5

    ListofBritishStandardsthataretobewithdrawnon31st March2010

    Geotechnics BS8002(CP)Earthretainingstructures( ) g BS8004(CP)Foundations BS8081(CP)Groundanchorages

    Butmanymorearebeingrevised... BS5930(CP)Siteinvestigations BS6031(CP)Earthworks BS6349(CP)Marinestructures BS8006(CP)Strengthened/reinforcedsoilsandotherfills BS8102(CP)Protectionofstructuresagainstwaterfromtheground

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 9

    Whatwegain

    April2010 thedeathofBritishSt d dStandards

  • 6

    TheEurocodeprogramme

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 11

    Eurocode7sconnectingstandardsEN

    1536

    EN 15

    37

    EN 15

    38 EN 12

    063

    cutio

    n

    rdsl

    ISO 14

    688

    3

    EN

    EN 12

    715

    EN 12

    716

    EN 12

    699

    EN 14

    199

    EN 14

    475

    EN 14

    679

    Exec

    u

    stand

    ards

    Geote

    chnic

    al

    inves

    tigati

    on

    and t

    estin

    g

    stand

    ards

    2247

    6ISO

    2247

    5

    ISO

    2228

    2

    ISO 17

    892

    ISO 14

    689

    2

    12

    6

    12N

    1998

    EN 19

    99

    5

    EN 14

    731

    EN 15

    237

    ENISO

    22

    13EN

    1

    EN 1997

    5

    ISO 22

    477

    13

    2

    EN 19

    90

    EN 19

    91

    EN 19

    92

    EN 19

    93 EN

    1996

    EN 19

    95

    EN 19

    94

    EN Eu

    roco

    des

    3

    2 26

    341

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 12

  • 7

    Geotechnicalinvestigationandtesting

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 13

    Executionofspecialgeotechnicalworks

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 14

  • 8

    Technicaldifferences(structural)

    April2010 thedeathofBritishSt d dStandards

    Contentsoftheresistancestandards

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 16

  • 9

    KeydifferencesfromBritishStandards

    Eurocodes dealwithphenomena,notelementtypes ULS:bending,shear,torsion,punching,fatigue SLS:stresslimitation,crackcontrol,minimumreinforcement,

    deflectioncontrol Secondorderanalysisisdefault(butfirstorderwillusually

    suffice) Extensiveuseofsubscripts,somehelpful,sometedious

    NEd =axialforceinamember NRd =resistancetoaxialforceRd Ac,eff,loc =effectivecompressionareaduetoplatesubpanellocal

    buckling MPapreferredtoN/mm2forunitsofstress

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 17

    Membersignconventionisnowcompatiblewithsoftware,i.e.xx

    alongmember

    z z

    yy

    zv

    y y

    z

    u

    u

    z

    y y

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 18

    z z

    u

    vz

  • 10

    KeyfeaturesofEurocode2

    Designbasedoncylinderstrength(0.8 cubestrength) e.g.C40/50=40MPa cylinder(fck),50MPa cubestrength

    Highstrengthgradescovered uptoC90/105forbuildings,C70/85forbridges

    Stressblocksgiven,designformulaebasedonthemarenot Steelreinforcement

    Partialmaterialfactors =1.15 YoungsmodulusE=200GPa Coefficientofthermalexpansion=10106K1U k d li l ti l i itt d f ll li it t t Uncrackedlinearelasticanalysispermittedforalllimitstates

    Plasticanalysis allowedforbuildingsifsufficientrotationcapacity notallowedforbridges(exceptforaccidentalsituations)

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 19

    Similartocurrentpractice

    ThosefamiliarwiththemethodsinBS8110willfind the Eurocode procedures not toofindtheEurocodeproceduresnottoo

    dissimilartocurrentpracticebutinevitablytheywillneedtogothroughalearningcurve.Onthewholethedesignsresultingfromthe

    twocodesarelikelytobereasonablycomparable comparable.

    NaryNarayananProc.ICE,CivilEngineeringSpecialIssue(2001)

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 20

  • 11

    KeyfeaturesofEurocode3

    Yieldstrengthvarieswiththickness(asinBSs5400and5950) Steelproperties

    YoungsmodulusE=210GPa forstructuralsteel c.f.200GPa forrebarinEN1992

    Poissonsration=0.3 Unitmass(massdensity)=7850kg/m3 Coefficientofthermalexpansion=12106K1

    Partialmaterialfactors yield,M0 =1.0 shear buckling M1 = 1 0 (buildings) 1 1 (bridges)shearbuckling,M1 =1.0(buildings),1.1(bridges) fractureintension,M2 =1.25

    Sectionclassification forClass1or2crosssections,basedonplasticstressblock forClass3or4crosssections,basedonelasticstressblock

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 21

    Classificationofsteelcrosssections

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 22

  • 12

    Eurocode3offersgreaterversatility

    ThescopeofEurocode3isverywideintermsoftypesofstructures,formsofconstructionandmethodsofdesign

    d i landmaterials.Inrelationtocommontypesofbuildingusinghotrolledsections,thedifferencesinresultsareonlyminor,though

    thedesignproceduresaresometimesmoretedious.Bypresentingalltherulesforaswideavarietyofsteeldesign

    aspossibleinaconsistentformat,thespecialiststeeldesignerwillbegivenagreatversatilitythaneverbefore.

    ColinTaylorProc.ICE,CivilEngineeringSpecialIssue(2001)

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 23

    Impactofresistancestandards

    Initialshockduetonumberofdocumentsandscatter of rulesscatter ofrules

    Somestateoftheartdesignmethodsdiffer,butmanymethodsaspreviousUKpractice

    MostdaytodayrulesaresimilartoBritishStandardequivalents

    Different(touse),notmoredifficultChrisHendy

    NCEConf.onBuildingBetterBridges,London(2005)

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 24

  • 13

    Technicaldifferences(geotechnical)

    April2010 thedeathofBritishSt d dStandards

    LimitstatePrinciples

    Structuraldesignisbasedonlimitstateprinciples:A distinction shall be made between ultimate andAdistinctionshallbemadebetweenultimateand

    serviceabilitylimitstatesEN19903.1(1)P

    Geotechnicaldesignisnowbasedonlimitstateprinciples:F h t h i l d i it ti it h ll bForeachgeotechnicaldesignsituationitshallbeverifiedthatnorelevantlimitstate,asdefinedin

    EN1990isexceededEN199712.1(1)P

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 26

  • 14

    Verificationofgeotechnicalstrength

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 27

    DesignApproachesforSTR/GEO

    Design Approach1 2 31 2 3

    Combination 1

    Combination 2

    Actions Material properties

    Actions (or effects)& resistances

    Structural actions (or effects)& material properties

    A1 + M1 + R1 A2 + M2 + R1 A1 + M1 + R2 A1/A2 + M2 + R3A1 + M1 + R1 A2 + M2 + R1 A1 + M1 + R2 A1/A2 + M2 + R3

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 28

  • 15

    NationalchoiceofDesignApproach

    Nov-09 (c)2009 Geocentrix Ltd. All rights reserved 29

    NotablechangetotheDesignManualforRoadsandBridges(DMRB)

    DMRBcannolongerreproduceandmodifysections of StandardssectionsofStandards

    ItcanonlycontaininformationthatiscomplementarytotheEurocodes

    alongwithnoncontradictoryrequirements

    F f t d i t i t f N ti lForsafetyreasons,designtoamixtureofNationalStandardsandEurocodes