april 2010 the death of british standards

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


3

HighwaysAgencyEurocodes strategy

TheuseofcurrentNationalStandardswillti t b itt d til BSI ithdcontinuetobepermitteduntilBSIwithdraws

them.OncewithdrawntheAgencywillspecifythathighwaystructuresshallonlybedesignedinaccordancewithEurocodes

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


Whatwelose


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



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


5


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


Whatwegain


6

TheEurocodeprogramme


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


7

Geotechnicalinvestigationandtesting


Executionofspecialgeotechnicalworks


8

Technicaldifferences(structural)


Contentsoftheresistancestandards


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


Membersignconventionisnowcompatiblewithsoftware,i.e.xx

alongmember

z z

yy

zv

y y

z

u

u

z

y y


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)


Similartocurrentpractice

ThosefamiliarwiththemethodsinBS8110willfind the Eurocode procedures not toofindtheEurocodeproceduresnottoo

dissimilartocurrentpracticebutinevitablytheywillneedtogothroughalearningcurve.Onthewholethedesignsresultingfromthe

twocodesarelikelytobereasonablycomparable comparable.

NaryNarayananProc.ICE,CivilEngineeringSpecialIssue(2001)


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


Classificationofsteelcrosssections


12

Eurocode3offersgreaterversatility

ThescopeofEurocode3isverywideintermsoftypesofstructures,formsofconstructionandmethodsofdesign

d i landmaterials.Inrelationtocommontypesofbuildingusinghotrolledsections,thedifferencesinresultsareonlyminor,though

thedesignproceduresaresometimesmoretedious.Bypresentingalltherulesforaswideavarietyofsteeldesign

aspossibleinaconsistentformat,thespecialiststeeldesignerwillbegivenagreatversatilitythaneverbefore.

ColinTaylorProc.ICE,CivilEngineeringSpecialIssue(2001)


Impactofresistancestandards

Initialshockduetonumberofdocumentsandscatter of rulesscatter ofrules

Somestateoftheartdesignmethodsdiffer,butmanymethodsaspreviousUKpractice

MostdaytodayrulesaresimilartoBritishStandardequivalents

Different(touse),notmoredifficultChrisHendy

NCEConf.onBuildingBetterBridges,London(2005)


13

Technicaldifferences(geotechnical)


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


14

Verificationofgeotechnicalstrength


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


15

NationalchoiceofDesignApproach


NotablechangetotheDesignManualforRoadsandBridges(DMRB)

DMRBcannolongerreproduceandmodifysections of StandardssectionsofStandards

ItcanonlycontaininformationthatiscomplementarytotheEurocodes

alongwithnoncontradictoryrequirements

F f t d i t i t f N ti lForsafetyreasons,designtoamixtureofNationalStandardsandEurocodes willnotbepermittedwww.highways.gov.uk/business/1198.aspx


16

Whathelpisthere?


ContentsofaEurocode

CENpublishestextofEurocode(EN)

NationalStandardsBodies(NSBs)mayadd NationalTitlePage NationalForeword NationalAnnex

EurocodepublishedbyCEN EN1990 i l d bli h d NationalcodepublishedbyNSB BSEN1990(inUK) DINEN1990(inGermany) NFEN1990(inFrance)


17

NationalAnnexcompletestheEurocodejigsaw


StatusofUKNationalAnnexes(September2009)


18

PublishedDocuments

Supportingdocumentproducedbycommitteeforinformationonlyincludesguidance,reportsand

d i recommendationsBSIguidetostandardization(2005)

AdoptionsofCEN,CENELEC,ISOorIECpublicationsthatarethemselvesnotstandards(e.g.TechnicalReports)

DerivedfromBritishStandardsthatconflictwithENsbutarestillneededbyindustry Developedbynationalcommitteesbutdonotgothroughthewholedevelopment

processinstrictconformitywithBS

Thisisacatchallcategoryforstandardstypedocumentsthatdonothavethesamestatusasa

BSBSIWebsite


UKPublishedDocumentsforEurocodes

PD Year For BS EN Subject6687 2006 BP 1992-1 Concrete Design of concrete structures (general)6687-2 2007 R 1992-2 Concrete bridges6688-1-2 2007 BP 1991-1-2 Actions Actions on structures exposed to fire6688 1 2 00 1991 1 2 Actions Actions on structures exposed to fire6688-1-7 2009 R 1991-1-7 Accidental actions6694-1 DPC R 1997-1 Geotech. Geotechnical design (subject to traffic

loading)6695-1-9 2008 R 1993-1-9 Steel Design of steel structures for fatigue6695-1-10 2009 R 1993-1-10 Material toughness and through-

thickness properties6695-2 2008 R 1993-2 Steel bridges6696-2 2007 R 1994-2 Composite Composite steel and concrete bridges6698 2009 R 1998-2 Earthquake Design of structures for earthquake q g q

resistanceBP = Background paper to the UK National Annex(es) R = Recommendations for the design of structures


19

FuturePublishedDocumentsPD Year For BS EN Subject6687-1 11/09 BP 1992-1 & -3 Concrete Design of concrete structures (general)6688-1-1 ? BP 1991-1-1 Actions Densities, self-weight, imposed loads

for buildingsfor buildings6688-1-4 9/09 BP 1991-1-4 Wind actions6688-1-5 12/09 BP 1991-1-5 Thermal actions6688-2 12/09 R 1992-2 ? ?6693-1 12/09 ? Timber ?6693-2 12/09 ? ?6702-1 09/09 ? Aluminium ?6705-3 09/09 ? ?BP = Background paper to the UK National Annex(es) R = Recommendations for the design of structures g


PD66941Recommendationsforthedesignofstructuressubjecttotraffic

loadingtoBSEN199711. General

2. Basisofdesigng3. Spreadfoundations4. Piledfoundations5. Gravityretainingstructuresandbridgeabutments6. Embeddedwalls7. Integralbridges8. Buriedconcretestructures9. Bibliography

A. Diagramsshowingloadcasestobeconsideredforburiedconcretestructures


20

HighwaysAgencysDesignManualforRoadsandBridges

DMRBcannolongerreproduceandmodifysectionsofStandards

OnlycontaininformationcomplementarytotheEurocodes Alongwithadditional(noncontradictory)requirements

50existingBDsandBAssomeinformationwillbe superseded retainedinaformcomplementarytotheEurocodes

ithd ( t f d t ) withdrawn(asoutofdate)

Thiswillresultintherebeingfewer,morefocusedDMRBpartsforthedesignofhighwaystructures


BSIStructuralEurocodes Companion

64pagecompanionguidetotheStructuralEurocodes

Guidewrittenbyleadingindustryexperts

Deliverspracticalandtimelyadviceonhowthenewcodeswillworkandhow they might benefithowtheymightbenefitconstructionprofessionals

AvailablefreeofchargefromtheBSIwebsite


21

DecodingEurocode7bookwww.decodingeurocode7.com

BookpublishedAugust2008 Keyfeatures

C EN 1997 1 d 2 l CoversENs19971and2,plusrelevantpartsofotherEurocodes

Alsocoversassociatedexecutionandtestingstandards

Explainskeyprinciples Illustratesapplicationruleswith

reallifecasestudies Materialextensivelytestedon

trainingcoursesover5years AuthorsAndrewBond

(Geocentrix)andAndyHarris(Geomantix)

PublishedbyTaylorandFrancisinhardback,withcoloursection

ISBN:9780415409483


DecodingtheEurocodesblogwww.eurocode7.com

WeblogstartedMay2006 Aimtopostarticlesatleast

h f ll ionceamonth,onfollowingsubjects: BGA Books BSI Eurocode3 Eurocode7 ICE IStructE Seminars Singapore StructuralEurocodes Trainingcourses


22

ETC10Designexample2www.eurocode7.com/etc10


Conclusion


23

Ofvitalimportance

TheEurocodes willbecometheEuropewidemeans of designing Civil and StructuralmeansofdesigningCivilandStructural

engineeringworksandsotheyareofvitalimportancetoboththedesignand

constructionsectorsoftheCivilandBuildingindustries

IntroductiontoEurocodes

EuropeanCommissionwebsite(http://ec.europa.eu)


TheEurocodeScreambyJackOfford(withapologiestoMunch)


april 2010 the death of british standards

Documents

en eurocodes32

steel composite

use of structural steel

concrete bridges parts

mastsandchimneys bs8100lattice