BC 1: 2008 BC 1: 2008 Implementation Issues Implementation Issues & Current Revisions & Current Revisions by: by: Chiew Sing Chiew Sing-Ping Ping Nanyang Technological University Nanyang Technological University Singapore Singapore http://www.bca.gov.sg/Publications/others/Design_Guide_on_use_of_Structural_Steel.pdf http://www.bca.gov.sg/Publications/others/Explanatory_Notes_for_BC1-2008.pdf Since January 2009 Implementation Issues Implementation Issues BC 1: 2008 BC 1: 2008 Urghhh !! Urghhh !!
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BC 1: 2008BC 1: 2008
Implementation IssuesImplementation Issues
& Current Revisions& Current Revisions
by:by:
Chiew SingChiew Sing--PingPing
Nanyang Technological UniversityNanyang Technological University
�� To allow a wider choice of steel materials to To allow a wider choice of steel materials to achieve greater economy and sustainability achieve greater economy and sustainability
�� To ensure product conformity, quality and To ensure product conformity, quality and traceability in materials from various sourcestraceability in materials from various sources
Deliverables:Deliverables:
�� Use only adequate & reliable alternative materials Use only adequate & reliable alternative materials to ensure public safetyto ensure public safety
�� Optimize usage of alternative materials (e.g. use Optimize usage of alternative materials (e.g. use full design strength) for more competitive designfull design strength) for more competitive design
�� Address longAddress long--standing material problems facing standing material problems facing the steel construction sectorthe steel construction sector
BC 1 BC 1 –– ObjectivesObjectives
Two major concernsTwo major concerns
Adequacy?Adequacy? Reliability?Reliability?
Material Material
performance performance
requirementsrequirements
Quality Quality
assurance assurance
requirementsrequirements
BC 1 BC 1 –– Main concernsMain concerns
BC 1 BC 1 –– Material performance Material performance
still being used and available in large quantity!!
�� Manufacturer test certificate (MTC)Manufacturer test certificate (MTC)
�� Factory production control (FPC)Factory production control (FPC)
certificatecertificate
Why MTC not good enough?
BC 1 BC 1 –– Quality assurance Quality assurance
requirements requirements
Clas s 2Class 1 Clas s 3
Adequacy as s es s ment
(s e e 4 .1 )
Stee l mate rials for
s tructural us e in Singapore
Re liability as s es s ment
(se e 4 .2 )
Re liability as s es s ment
(s e e 4 .2 )
by ce r tifica t ion
(s e e 4 .1 .1)
by ma te r ia l te s t ing
(s e e 4 .1 .2 )
Ke y:
Pass
Fa il
BC 1 BC 1 –– Design frameworkDesign framework
BS EN, ASTM, AS/NZS, JIS & GB For e.g. IS, KS, API
Not common route !!
�� An An interim measure interim measure for certified steel materialsfor certified steel materials
�� The material can be treated as The material can be treated as Class 2Class 2 if its if its
adequacy & reliability are guaranteed through adequacy & reliability are guaranteed through
material testing and control plan, e.g. material material testing and control plan, e.g. material
testing based on testing based on 1 test unit per batch/heat1 test unit per batch/heat, test , test
report from accredited laboratory and material report from accredited laboratory and material
compliance reportcompliance report
�� Implication:Implication:
We (instead of steel mills) continue to shoulder We (instead of steel mills) continue to shoulder
the quality problem!the quality problem!
BC 1 BC 1 –– Cl. 4.4 Alternative route Cl. 4.4 Alternative route
�� We have taken a bold step to liberalize the use of We have taken a bold step to liberalize the use of
steel materials in Singapore. We now have a wider steel materials in Singapore. We now have a wider
choice to choose steel from more diverse sources; choice to choose steel from more diverse sources;
however, it is important in the process, we do not however, it is important in the process, we do not
compromise quality and public safety.compromise quality and public safety.
�� While we are liberalizing, we are also tightening in While we are liberalizing, we are also tightening in
some aspects, especially on quality assurance for the some aspects, especially on quality assurance for the
steel products which are being brought into steel products which are being brought into
Singapore.Singapore.
Key Points of BC 1 (1)Key Points of BC 1 (1)
�� To qualify for To qualify for Class 1Class 1 steel, it will be necessary for steel, it will be necessary for
stockists, traders and stockists, traders and steel specialist builderssteel specialist builders to to
purchase from purchase from ‘‘audited millsaudited mills’’ who have in place who have in place
proper factory production control system, and for proper factory production control system, and for
audited mills to provide proper test certification (MTC audited mills to provide proper test certification (MTC
& FPC) for their products.& FPC) for their products.
�� Steel from Steel from ‘‘nonnon--audited millsaudited mills’’ can only qualify for can only qualify for
Class 2Class 2 under alternative route if adequacy and under alternative route if adequacy and
reliable are guaranteed through material batch/heat reliable are guaranteed through material batch/heat
testing.testing.
Key Points of BC 1 (2)Key Points of BC 1 (2)
�� Guide is blind to Guide is blind to ‘‘country of origincountry of origin’’; all steels are ; all steels are
allowed and are treated the same, including BS/EN allowed and are treated the same, including BS/EN
steelssteels
�� ‘‘Who produces the steelWho produces the steel’’, i.e. the mills where the steel , i.e. the mills where the steel
come from will now become importantcome from will now become important
�� The intent is to raise the The intent is to raise the ‘‘material quality barmaterial quality bar’’ based on based on
‘‘trust and sharedtrust and shared--responsibilityresponsibility’’ amongst all key amongst all key
stakeholdersstakeholders
Key Points of BC 1 (3)Key Points of BC 1 (3)
Is BC 1 your foe?Is BC 1 your foe?
BC 1 favors European mills with FPC and BC 1 favors European mills with FPC and
discredits regional Asian mills without FPC.discredits regional Asian mills without FPC.
BS materials from these regional mills without BS materials from these regional mills without
FPC will now be FPC will now be ‘‘downgradeddowngraded’’ to Class 2.to Class 2.
FPC is no guarantee of quality, material FPC is no guarantee of quality, material
testing is better.testing is better.
BC 1 gives Chinese steel specialist builders an BC 1 gives Chinese steel specialist builders an
edge over local builders, byedge over local builders, by--passing many passing many
local stockists, traders and service providers in local stockists, traders and service providers in
the process.the process.
Current RevisionsCurrent Revisions
BC 1: 2012BC 1: 2012
Current Revisions of BC 1Current Revisions of BC 1
�� Working title: Working title: ““BC 1: 2012 Design Guide on BC 1: 2012 Design Guide on
use of alternative structural steel to BS5950 use of alternative structural steel to BS5950
and Eurocode 3and Eurocode 3”” to cover expanded scope:to cover expanded scope:--
�� Additional material categories (Section 2)Additional material categories (Section 2)
�� Specific provision to Clause 4.4 (Section 4)Specific provision to Clause 4.4 (Section 4)
�� Design parameters to Eurocode 3 (Section 5)Design parameters to Eurocode 3 (Section 5)
�� Material traceability & reusability for Material traceability & reusability for rere--use steel use steel
((newnew Section 6 for struts and sheet piles)Section 6 for struts and sheet piles)
�� Update of material standards, and hence the list of Update of material standards, and hence the list of
certified steel materials (Appendix A)certified steel materials (Appendix A)
�� Inclusion of 2 new material categories:Inclusion of 2 new material categories:--
–– HotHot--rolled steel barsrolled steel bars –– round/flat/square bars up to round/flat/square bars up to
grade 690/1000 based on EN 10058/59/60;grade 690/1000 based on EN 10058/59/60;
–– Sheet pilesSheet piles –– hothot--rolled sheet piles to JIS A5523 & rolled sheet piles to JIS A5523 &
EN 10248, coldEN 10248, cold--formed sheet piles to EN 10249; formed sheet piles to EN 10249;
pipe piles & steel piles are already covered under pipe piles & steel piles are already covered under
‘‘hothot--rolled sectionsrolled sections’’ and and ‘‘hollow sectionshollow sections’’..
Important NoteImportant Note: : Sheet piles to JIS A5528 notSheet piles to JIS A5528 not--
certified (Grades SY295 and SY390)certified (Grades SY295 and SY390)
BC 1: 2012BC 1: 2012
Updates in Section 2Updates in Section 2
�� Clause 4.4 Special Case is made more Clause 4.4 Special Case is made more
specific and clearer, i.e. the written plan specific and clearer, i.e. the written plan
should comprise should comprise at least one set of material at least one set of material
testing for each batch/lot of steel materialstesting for each batch/lot of steel materials
(instead of (instead of ““100% material testing100% material testing””))
BC 1: 2012BC 1: 2012
Updates in Section 4Updates in Section 4
�� Inclusion of design recommendations to Inclusion of design recommendations to EN 1993EN 1993
�� Simplification of design parameters tables for Simplification of design parameters tables for
ASTM/AS steel materials* and boltsASTM/AS steel materials* and bolts
–– *Gradual downgrading of material strengths are applied to *Gradual downgrading of material strengths are applied to ASTM/AS steel materials as thickness increasesASTM/AS steel materials as thickness increases
�� Omission of boltOmission of bolt--nutnut--washer matching tables washer matching tables ––
more appropriate to refer to the material standardsmore appropriate to refer to the material standards
�� Inclusion of GB/T 19879:2005 steels up to Q460, Inclusion of GB/T 19879:2005 steels up to Q460,
–– *Steel for cold forming is also accepted as *Steel for cold forming is also accepted as certified materials for cold formed sheet pilescertified materials for cold formed sheet piles
BC 1: 2012BC 1: 2012
Updates in Appendix AUpdates in Appendix A
Summary (1)Summary (1)
� Implementation issues of BC 1:-
� BC 1 provides a level playing field for all steel & promotes quality material usage
� Unless quality and consistency of the steel can be assured through proper factory production control (FPC) certification, steel can at bestqualify for Design Class 2 and an appropriate material safety factor should be used
� There are still plenty of non-certified steel being used, for e.g. BS 4360 Grade 43A, ASTM Grade A500, JIS G3101 Grade SS400, etc.
Summary (2)Summary (2)
�� Current revisions of BC 1 to cover extended Current revisions of BC 1 to cover extended
scope & updated material standards:scope & updated material standards:--
�� Additional material categories Additional material categories –– steel bars & sheet steel bars & sheet
pilespiles
�� Design recommendations to Eurocode 3Design recommendations to Eurocode 3
�� Material traceability & reusability for sheet piles & Material traceability & reusability for sheet piles &
steel strutting systemsteel strutting system
�� Update of the list of certified steel materials per Update of the list of certified steel materials per
latest material production standardslatest material production standards
�� Good for Good for stockists/traders and steel specialist builders/suppliers to keep abreast of development