UK National Annex to Eurocode 5 Design of timber structures – Part 1 1 General – Common rules and rules for buildings ICS 91 010 30; 91 080 20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY[.]
Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 NAto toBS BSEN EN1995-1-1:2004+A1:2008 1995-1-1:2004+A1:2008 NA Incorporating Incorporating National National Amendment Amendment No No NATIONAL ANNEX UK National Annex to Eurocode 5: Design of timber structures – Part 1-1: General – Common rules and rules for buildings ICS 91.010.30; 91.080.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Licensed Licensed Copy: Copy: Ms Copy: Ms Jacqueline Jacqueline Ms Jacqueline Burman, Burman, Burman, British British British Standards Standards Standards Institution, Institution, Institution, 15/02/2012 15/02/2012 15/02/2012 10:25, 10:25, 10:25, Uncontrolled Uncontrolled Uncontrolled Copy, Copy, (c) Copy, (c) The The (c) British British The British Standards Standards Standards Institution Institution Institution 2012 20122012 NA to toBS BSEN EN 1995-1-1:2004+A1:2008 NA 1995-1-1:2004+A1:2008 NA to BS EN 1995-1-1:2004+A1:2008 NA to BS EN 1995-1-1:2004+A1:2008 Publishing and copyright information The BSI copyright displayed in this document indicates when the Publishing andnotice copyright information document wasand last issued Publishing copyright information The BSI copyright notice displayed in this document indicates when the The BSI copyright displayed in this document indicates when the © BSI 200 Standards document was last notice issued.Institution The British 2012 document was last issued ISBN Limited 2012 Published by580 BSI65038 Standards © BSI978 20009 © BSI 2009 78020 The following BSI65038 references relate to the work on this standard: ISBN 978 580 32 ISBN 978 0reference 580 65038 Committee B/525/5 The BSI references relate to the work on this standard: 05/30128360 Draftfollowing for comment The following BSI references Committee reference B/525/5relate to the work on this standard: Committee reference 05/30128360 Draft Draftsfor forcomment comment B/525/5 5/30128360 DC; Draft for comment 05/30128360 12/30261261 DC Publication history First edition, October Publication history2006 Publication history First edition, October 2006 First edition, October 2006 Amendments issued since publication Amendments issued since publication Amd no Date Text affected Amendments issued since publication Amd no A1 Amd no A1 A1 Date 31 October 2009 Date 31 October 2009 31 October 2009 A2 31 October 2012 Text affected Addition of 6.1.7(2) in Scope, Text affected insertion of new subclause NA.2.5 Addition of 6.1.7(2) and new Table NA.4; in seeScope, introduction Addition of in Scope, insertion of 6.1.7(2) new subclause NA.2.5 insertion of newNA.4; subclause NA.2.5 and new Table see introduction and new Table NA.4; see introduction See Introduction Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 NA NA to BS ENEN 1995-1-1:2004+A1:2008 to BS 1995-1-1:2004 +A1:2008 Contents Introduction NA.1 NA.2 NA.3 NA.4 Scope Nationally Determined Parameters Guidance on using informative annexes Reference to non-contradictory complementary information Bibliography List of tables Table NA.1 – Load-duration classes Table NA.2 – Service classes Table NA.3 – Partial factors γM for material properties and resistances Table NA.4 – Value of modification factor, kcr Table NA.5 – Limiting values for deflections of individual beams Table NA.6 – Limits for a and b in BS EN 1995-1-1:2004+A1:2008 expressions (7.3) and (7.4) Table NA.7 – Values of modification factors for bracing systems Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages to , an inside back cover and a back cover © BSI2012 2009 ã ã ii â The British Standards Institution Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 NA to toBS BSEN EN 1995-1-1:2004+A1:2008 NA 1995-1-1:2004+A1:2008 ii ii ãã â © BSI The200 British Standards Institution 2012 This page deliberately left blank Licensed Licensed Licensed Copy: Copy: Copy: MsMs Jacqueline Ms Jacqueline Jacqueline Burman, Burman, Burman, British British British Standards Standards Standards Institution, Institution, Institution, 15/02/2012 15/02/2012 15/02/2012 10:25, 10:25, 10:25, Uncontrolled Uncontrolled Uncontrolled Copy, Copy, Copy, (c)(c) The (c) The The British British British Standards Standards Standards Institution Institution Institution 2012 2012 2012 NA to BS EN 1995-1-1:2004+A1:2008 NA NA to BS ENEN 1995-1-1:2004+A1:2008 to BS 1995-1-1:2004+A1:2008 NA to BS EN 1995-1-1:2004+A1:2008 National Annex NA (informative) to National Annex NA (informative) to National Annex NA (informative) to +A1:2008, Eurocode 5: BS EN 1995-1-1:2004 +A1:2008, Eurocode 5: BS EN 1995-1-1:2004 +A1:2008, Eurocode 5: BS EN 1995-1-1:2004 Design of timber structures – Part 1-1: General –– Design of timber structures – Part 1-1: General Design ofrules timber structures –buildings Part 1-1: General – Common and rules for Common rules and rules for buildings Common rules and rules for buildings Introduction Introduction This National National Annex Annex has is published by BSIby Standards Limited, under Introduction This been prepared BSI Subcommittee B/525/5, licence fromuse The Standards Thisin National Annex This National Annex has been prepared Subcommittee B/525/5, Structural ofBritish timber In the UKInstitution it isby to BSI be used conjunction with This National Annex prepared by BSI Subcommittee B/525/5, has been prepared byhas BSIbeen Subcommittee B/525/5, Structural use of Structural use of timber In the UK it is to be used in conjunction BS EN 1995-1-1 for the design of timber structures, together with with Structural useUK offor timber Inused theofUK it is to be used conjunction timber In the it is todesign be in cojunction withinBS EN 1995-1-1 BS EN 1995-1-1 timber structures, together with with BS EN 1990 and BS the EN structures, 1991 and their National Annexes for the design of timber together with BS EN 1990 and BS EN 1995-1-1 for the design of timber structures, together with BS EN 1990 and BS EN 1991 and their National Annexes ThisEN National Annex has been and updated reflect Annexes Amendment A1:2008 to BS EN 1991 and their National Annexes BS 1990 BS EN 1991 their to National This National Annex hasThe been updated to reflect Amendment to BS EN 1995-1-1:2004 start and finish of text introducedA1:2008 or altered Annex has been updated to reflect Amendment A1:2008 to This National Annex reflects Amendment A1:2008 to BS EN 1995-1-1:2004 The start and finish of text introduced or altered by Amendment No is indicated in the text by tags Minor BS EN 1995-1-1:2004 The start and finish of text introduced or altered startrenumbering and finish introduced ortables by Amendment No isThe indicated in the textofby tags and Minor editorial changes including the oftext subclauses by Amendment No is indicated in the text by tags Minor altered by Amendment No and Amendment No is indicated in the editorial changes including the renumbering of subclauses and tables have not been tagged editorial changes including the renumbering subclauses and tables haveby not been tagged text tags and Minor editorialofchanges including the have not been renumbering oftagged subclauses and tables have not been tagged NA.1 Scope NA.1 Scope National Annex gives: NA.1 This Scope This National Annex gives: a) UK decisions for the Nationally Determined Parameters Thisthe National Annex gives: a) the UK decisions for the Nationally Determined Parameters described in the following subclauses of a) the UK decisions for the Nationally Determined Parameters described in the following subclauses of BS EN 1995-1-1:2004 +A1:2008 : described in the following subclauses of +A1:2008 BS EN 1995-1-1:2004 : • 2.3.1.2(2)P BS EN 1995-1-1:2004 +A1:2008 : • 2.3.1.2(2)P 2.3.1.3(1)P • 2.3.1.2(2)P • 2.3.1.3(1)P • 2.4.1(1)P 2.3.1.3(1)P • 2.4.1(1)P • 6.1.7(2) 2.4.1(1)P • 6.1.7(2) • 6.4.3(8) • 6.1.7(2) • 6.4.3(8) • 7.2(2) • • 6.4.3(8) 7.2(2) 7.3.3(2) • 7.2(2) • 7.3.3(2) • 8.3.1.2(4) 7.3.3(2) • 8.3.1.2(4) • 8.3.1.2(7) 8.3.1.2(4) • 8.3.1.2(7) • 9.2.4.1(7) 8.3.1.2(7) • 9.2.4.1(7) • 9.2.5.3(1) 9.2.4.1(7) • 9.2.5.3(1) • 10.9.2(3) 9.2.5.3(1) • 10.9.2(3) • 10.9.2(4) 10.9.2(3) • 10.9.2(4) b) the decisions on the status of BS EN 1995-1-1:2004 +A1:2008 • UK 10.9.2(4) b) the UK decisions on the status of BS EN 1995-1-1:2004 +A1:2008 informative annexes; b) the UK decisions on the status of BS EN 1995-1-1:2004 +A1:2008 informative annexes; c) reference to non-contradictory complementary information informative annexes; c) reference to non-contradictory complementary information c) reference to non-contradictory complementary information NA.2 Nationally Determined Parameters NA.2 Nationally Determined Parameters NA.2 NationallyofDetermined Parameters NA.2.1 Assignment loads to load-duration classes NA.2.1 NA.2.1 Assignment of loads to load-duration classes [BS EN 1995-1-1:2004+A1:2008, 2.3.1.2(2)P] Assignment of loads to load-duration classes [BS EN 1995-1-1:2004+A1:2008, 2.3.1.2(2)P] [BS 1995-1-1:2004+A1:2008, 2.3.1.2(2)P] +A1:2008 , Table 2.2 is implemented BS ENEN 1995-1-1:2004 nationally BS EN 1995-1-1:2004 by using Table NA.1 +A1:2008 , Table 2.2 is implemented nationally BS using EN 1995-1-1:2004 by Table NA.1 +A1:2008 , Table 2.2 is implemented nationally by using Table NA.1 © BSI 2009 • © BSI2012 2009 • • © The British Standards Institution â BSI 2009 ã Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 NA to toBS BSEN EN 1995-1-1:2004+A1:2008 NA 1995-1-1:2004+A1:2008 Table NA.1 Load-duration classes Load-duration class Duration Examples of loading Permanent More than 10 years Self-weight Long-term months to 10 years Storage loading (including in lofts), water tanks Medium-term week to months Imposed floor loading Short-term Less than week Snow, maintenance or man loading on roofs, residual structure after accidental event Instantaneous Wind, impact loading, explosion NA.2.2 Assignment of timber constructions to service classes [BS EN 1995-1-1:2004 +A1:2008, 2.3.1.3(1)P] BS EN 1995-1-1:2004 +A1:2008 , 2.3.1.3(1)P is implemented nationally for common timber constructions by using Table NA.2 Table NA.2 NA.2.3 Service classes Type of construction Service class Cold roofs Warm roofs Intermediate floors Ground floors Timber-frame walls, internal and party walls Timber-frame walls, external walls External uses where member is protected from direct wetting External uses, fully exposed Partial factors for material properties [BS EN 1995-1-1:2004 +A1:2008, 2.4.1(1)P] BS EN 1995-1-1:2004 +A1:2008 , Table 2.3 is implemented nationally by using Table NA.3 Table NA.3 Partial factors γM for material properties and resistances Fundamental combinations Solid timber, timber, untreated grade stamp individually marked Solid timber, timber, preservative-treated grade stamp package marked 1,3 1,3 2,0 Glued laminated timber 1,25 LVL, plywood, OSB 1,2 Particleboard 1,3 Fibreboards, hard 1,3 Fibreboards, medium 1,3 Fibreboards, MDF 1,3 Fibreboards, soft 1,3 Connections (except for punched metal plate fasteners) 1,3 Punched metal plate fasteners, anchorage strength 1,3 Punched metal plate fasteners, plate (steel) strength 1,15 Accidental combinations 1,0 2 ãã â â BSI The200 British Standards Institution 2012 Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 NA NA toNA BS EN 1995-1-1:2004+A1:2008 to to BS BS EN EN 1995-1-1:2004+A1:2008 1995-1-1:2004+A1:2008 NA.2.4 NA.2.4 Tensile Tensile stresses stresses perpendicular perpendicular toto grain grain inin double double tapered, tapered, curved curved and and pitched pitched cambered cambered beams beams [BS [BS EN EN 1995-1-1:2004 1995-1-1:2004 , 6.4.3(8)] , 6.4.3(8)] +A1:2008 +A1:2008 TheThe tensile tensile stresses stresses perpendicular perpendicular to grain to grain in double in double tapered, tapered, curved curved andand pitched pitched cambered cambered beams beams should should be be evaluated evaluated using using +A1:2008 +A1:2008 BSBS ENEN 1995-1-1:2004 1995-1-1:2004 , Expression , Expression 6.54 6.54 NA.2.5 NA.2.5Modification Modification factor factor for for influence influence ofof cracks cracks onon shear shear resistance resistance [BS [BS EN EN 1995-1-1:2004 1995-1-1:2004 +A1:2008, +A1:2008, 6.1.7(2)] 6.1.7(2)] BSBS ENEN 1995-1-1:2004+A1:2008, 1995-1-1:2004+A1:2008, 6.1.7(2) 6.1.7(2) is implemented is implemented nationally nationally , given in Table in Table NA.4 NA.4 by by using using values values forfor thethe modification modification factor, factor, kcr,kgiven cr 0,67 0,67 1,0 1,0 6 Limiting NA.2 NA.2 Limiting values values for for deflections deflections ofof beams beams [BS [BS EN EN 1995-1-1:2004 1995-1-1:2004 , 7.2(2)] , 7.2(2)] +A1:2008 +A1:2008 As As stated stated in BS in BS ENEN 1990:2002, 1990:2002, A1.4.2(2), A1.4.2(2), thethe serviceability serviceability criteria criteria should should be be specified specified forfor each each project project andand agreed agreed with with thethe client client TheThe 5, which 5, which values values in Table in Table NA.NA take take intointo account account creep creep deformations, deformations, areare given given forfor guidance guidance 5 Limiting Table Table NA.NA Limiting values values forfor deflections deflections of of individual individual beams beams Type Type of member of member Limiting Limiting value value forfor netnet final final deflections deflections of of individual individual beams, beams, wnet,fin wnet,fin A member A member of span, of span, = = A member A member with with a a = = between between two two supports supportscantilever, cantilever, Roof Roof or floor or floor members members with with a plastered a plastered or plasterboard or plasterboard ceiling ceiling =/250 =/250 Roof Roof or floor or floor members members without without a plastered a plastered or plasterboard or plasterboard ceiling ceiling =/150 =/150 =/125 =/125 =/75=/75 + A1:2008 + A1:2008 NOTE NOTEWhen When calculating calculating wnet,fin, wnet,fin, wfinwshould be calculated be calculated as u as in accordance with with BS BS ENEN 1995-1-1:2004 1995-1-1:2004 , , fin should finuin fin accordance 2.2.3(5) 2.2.3(5) NA.2 NA.2 7 Vibrations Vibrations inin residential residential floors floors [BS [BS EN EN 1995-1-1:2004 1995-1-1:2004 , 7.3.3(2)] , 7.3.3(2)] +A1:2008 +A1:2008 NOTE NOTEForFor thethe value value of the of the modal modal damping damping ratio, ratio, ζ, in ζ, in + A1:2008 + A1:2008 BS BS ENEN 1995-1-1:2004 1995-1-1:2004 , 7.3.1(3), , 7.3.1(3), a value a value of 0,02 of 0,02 hashas been been found found appropriate appropriate forfor typical typical UKUK floors floors +A1:2008 +A1:2008 7.17BS NA.2 NA.2 .1 BS ENEN 1995-1-1:2004 1995-1-1:2004 , 7.3.3(2) , 7.3.3(2) is implemented is implemented 6 nationally nationally by by using using Table Table NA.NA 9 © BSI © BSI 200200 • •3 © The British Standards Institution 2012 • 3 Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 NA to to BS EN 1995-1-1:2004+A1:2008 NA NABS NA toEN BS to1995-1-1:2004+A1:2008 BS EN EN 1995-1-1:2004+A1:2008 1995-1-1:2004+A1:2008 NA.Limits 6NA.6Limits TableTable NA.Table for Limits afor andfor a band in a and BS b inEN bBS in1995-1-1:2004 EN BS EN 1995-1-1:2004 1995-1-1:2004 + A1:2008 + A1:2008 + A1:2008 expressions expressions expressions (7.3)(7.3) and(7.3) (7.4) andand (7.4) (7.4) Parameter Parameter Parameter LimitLimit Limit a, deflection a, deflection a, deflection of floor of under floor of floor under a under kNa point kN a 1point load kN point loadload 1,8 mm 1,8 mm 1,8 mm u 4=mm 000 u 000 mm mm for = u for4 =000 for 1,1 1,1 mm for = > 16 500/ 16=500/ 16mm 500/ for4=000 for = 1,1 =mm >4 =mm > 000 000 mm mm wherewhere = =where joist = =span joist = = joist in span mm span in mm in mm b, constant b, constant b,for constant the forcontrol the for control the ofcontrol unitofimpulse unit of unit impulse velocity impulse velocity response velocity response response for a for u 1afor mm ua 1u mm mm for a for > amm for > 1a mm > mm b = 180 b =–b180 60a = 180 – 60a – 60a b = 160 b =–b160 40a = 160 – 40a – 40a + A1:2008 + A1:2008 +, Figure A1:2008 NOTENOTE The NOTE formulae The formulae The for formulae b correspond for bfor correspond b correspond to BS EN to BS 1995-1-1:2004 toEN BS1995-1-1:2004 EN 1995-1-1:2004 , Figure 7.2 , Figure With 7.2 a With 7.2 value With a value of a0,02 value offor 0,02 of the 0,02 for the for the ζ, the ζunit , theζimpulse ,unit the unit impulse velocity impulse velocity response velocity response will response not will normally will not normally not normally govern govern thegovern size theofsize the floor size of joists floor of floor joists in joists in in modalmodal damping modal damping damping ratio,ratio, ratio, residential residential residential timber timber floors timber floors floors NA.2.NA.2 The The The recommended recommended limit limit on alimit on may aon be may acompared may be compared be compared with awithwith a a 7.2NA.2 7.2recommended corresponding corresponding corresponding floor floor deflection floor deflection deflection calculated calculated calculated as: as: as: 3 =k kk= k= k 000 0001 k000 48 ( EI 48 ) joist ( EI 48)(joist EI ) joist dist eq dist amp dist eq amp amp (NA.1) (NA.1) (NA.1a) (NA.1) ≤eqa -mm ≤ a- ≤mm a mm wherewhere where kdist k= kdist = proportion = proportion of point of point load of point acting loadload acting onacting a single on aon single joist a single joistjoist distproportion =eq =eq = equivalent =eq= equivalent = equivalent floor floor span floor span in mm span in mm in mm k amp k=ampamplification k amp = amplification = amplification factorfactor to account factor to account tofor account shear for shear for deflections shear deflections deflections in theincase the in case the case of solid of solid timber of solid timber and timber glued and and glued thin-webbed glued thin-webbed thin-webbed joistsjoists or joint joists or joint slip or joint inslip theslip in the in the case case of mechanically-jointed case of mechanically-jointed of mechanically-jointed floor floor trusses floor trusses trusses (EI)joist (EI) (EI) =bending stiffness stiffness stiffness of a joist of a of in joist aNmm² joist in Nmm² in (calculated Nmm² (calculated (calculated usingusing Emean using E ) mean E)mean) joist=bending joist=bending ⎧ ⎧ ⎧ wherewhere where ⎪ ⎪ ⎪ ]i/is 4] 4] ⎪ k strut⎪ k0,38 ⎪ k strut strut 0,38 – 0,08ln 0,38 – 0,08ln [–14 0,08ln EI [ 14 EI [ 14 b i/is b EI b i/is = ⎨max = max kdist k= kdist ⎨ ⎨ distmax ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎩ 0,30⎩ 0,30 ⎩ 0,30 = 0,97 = 0,97 kstrut k= kstrut 0,97 only only in only theincase the in of case thesolid case of solid timber of solid timber joists timber joists which joists which have which have a have a a strut transverse transverse transverse stiffness stiffness stiffness provided provided provided by single by single by or single multiple or multiple or lines multiple lines of lines of of herringbone herringbone herringbone strutting, strutting, strutting, or blocking or blocking or blocking with awith depth with a depth of a depth at of least atofleast at least 75% 75% the depth 75% the depth the of depth joists, of joists, of in joists, addition in addition in to addition that to provided that to that provided provided by theby the by the decking/ceiling, decking/ceiling, decking/ceiling, otherwise otherwise otherwise 1,0 1,0 1,0 (EI)b(EI) (EI) = floor flexural = floor flexural rigidity flexural rigidity perpendicular rigidity perpendicular perpendicular to thetojoists the to joists the in Nmm²/m joists in Nmm²/m in Nmm²/m b = bfloor s s = joist s = spacing joist = joist spacing in spacing mm in mm in mm =eq =eq = span, =eq= span, ==, in span, mm, =, in=mm, ,for in simply mm, for simply forsupported simply supported supported singlesingle span single span joists span joists joists = 0,9=0,875 0,9 = =the 0,9 = for for=end the forspans end the end spans of spans continuous of continuous of continuous joistsjoists joists = 0,85 =0,8 = 0,85 =0,85 for =the for=internal the for internal the spans internal spans of spans continuous of continuous of continuous joistsjoists joists 1,05 for text solid solidsolid timber joists k amp k=amp k amp = 1,05 = simply-supported 1,05 for simply-supported fordeleted simply-supported timber solid timber joists timber joists joists = 1,10 =Text 1,10 for = deleted continuous 1,10 for continuous for continuous solid solid timber solid timber joists timber joists joists for text glued glued thin-webbed joists = 1,20 1,15 = 1,15 = simply-supported 1,15 for simply-supported fordeleted simply-supported glued thin-webbed glued thin-webbed thin-webbed joists joists joists = 1,30 =Text 1,30 for = deleted continuous 1,30 for continuous for continuous gluedglued thin-webbed glued thin-webbed thin-webbed joistsjoists joists for text mechanically-jointed mechanically-jointed floorfloor trusses = 1,30 = 1,30 = simply-supported 1,30 for simply-supported fordeleted simply-supported mechanically-jointed mechanically-jointed floor trusses floor trusses trusses = 1,45 =Text 1,45 for = deleted continuous 1,45 for continuous for continuous mechanically-jointed mechanically-jointed mechanically-jointed floor floor trusses floor trusses trusses (EI)b(EI) (EI) is calculated as theasflexural the as flexural therigidity flexural rigidity ofrigidity theoffloor the of floor the decking floor decking decking b is calculated b is calculated perpendicular perpendicular perpendicular to thetojoists, the to joists, the using joists, using Emean using Efor E E for Discontinuities E for Discontinuities E Discontinuities at theat the at the mean mean edgesedges of edges floor of floor panels of floor panels orpanels theorends the or ends the of floor ends of floor boards of floor boards may boards be may ignored may be ignored be ignored 200 92009 4Theâ200 ãBritish BSI â BSIStandards ãã4â âãBSI Institution 2012 5/02/2012 10:25, Uncontrolled Licensed Copy: Copy,Ms (c)Jacqueline The BritishBurman, Standards British Institution Standards 2012Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 NA NA to BS ENEN 1995-1-1:2004+A1:2008 to BS 1995-1-1:2004+A1:2008 (EI)b may be increased by adding the flexural rigidity of plasterboard ceilings fastened directly to the soffit of the floor joists, assuming Eplasterboard = 000N/mm2 (EI)b may be increased for open web joists with a continuous transverse bracing member fastened to all the joists within 0,1= of mid-span, by adding the bending stiffness of the transverse member in Nmm2 divided by the span = in metres Also (EI)b may be increased for open web joists with two continuous transverse bracing members of equal cross-section and grade fastened to all the joists within 0,05= of one-third span points, by adding the bending stiffness of one of the transverse members in Nmm2 divided by the span, =, in metres. The fundamental frequency f1 should not be less than Hz unless a special investigation is made In BS EN 1995-1-1 expression 7.5 the mass of the floor should be the permanent actions only without including partition loads or any variable actions thethe equivalent platefrequency bending stiffness (EIcalculated ) of floors,asin Forcalculating girder joists fundamental should be In in expression NA.1b A girder joist is defined a single-member which the decking is adhesively bonded to theasjoists, no allowanceor multiple-member joist which directly joists or should be made for composite action supports unless theeither floorother is designed in another girder joist accordance with 9.1.2 and with adhesives meeting the requirements of 3.6 and the detailing and control provisions of 10.3 0.5 El 50 π load-carrying joist capacity of nails in end NA.2 Lateral (NA.1b) f1 = grainL[BS , 8.3.1.2(4)] 2Pi / L sin π a i / L +A1:2008 wEN s j + ∑1995-1-1:2004 t ( ) ( ) ( ) The application rules of BS EN 1995-1-1:2004 +A1:2008 , 8.3.1.2(4) should be used to determine the lateral load-carrying capacity of nails NA to BS EN 1995-1-1:2004+A1:2008 (NA.1c) in end w t =grain max w 0,75 Species sensitive to splitting in nailed joints (EI) where: b may be increased by adding the flexural rigidity of plasterboard [BS (EI) EN 1995-1-1:2004 , 8.3.1.2(7)] ceilings fastened directly to the soffit of the floor joists, assuming +A1:2008 joist is the mean bending stiffness of the girder joist in Nmm ; Eplasterboard = 000N/mm2 +A1:2008 The application of BSof ENthe 1995-1-1:2004 , 8.3.1.2(7) L isrules the span girder joist, in mm; should not be applied to nailed joints be increased open webinjoists with a continuous transverse (EI)b may Pi is the ith for point load, N, comprising only permanent bracing member fastened to all the joists within 0,1 = of mid-span, by actions calculated where appropriate using wt; the bending stiffness of transverse member in Nmm divided NA.2.10 adding Racking resistance ofthewall diaphragms aspan ismetres the distance from themay ith point load to the i be increased fornearest open web Also (EI) by the = in b [BS EN 1995-1-1:2004 support, in mm; +A1:2008 , 9.2.4.1(7)] joists with two continuous transverse bracing members of equal The racking resistance offastened wall width diaphragms should be evaluated sj is the tributary forthe thejoists uniformly distributed cross-section and grade to all within 0,05= ofby Method B loading, in m; one-third span points, by adding the bending stiffness of one of the by the span, transverse members in Nmm2 divided =, in metres. is the is uniformly load calculated using NOTEwtPD 6693-1-1 currentlydistributed under development It is anticipated expression NA.1c,toinMethod kN/m B, ; based on Method A. that it will include an alternative The fundamental frequency f1 should not be less than Hz unless a is the is weight being permanent actions only specialw investigation made.ofInthe BSfloor EN 1995-1-1 expression 7.5 the without including partition loads, in kN/m mass of the floor should be the permanent actions only without NA.2.11 Modification factors for bracing systems including partition loads or any variable actions NA.2.9 [BS EN 1995-1-1:2004 +A1:2008 , 9.2.5.3(1)] In calculating the equivalent plate bending stiffness (EI ) of floors, in BS EN 1995-1-1:2004 +A1:2008 , Table 9.2 is implemented nationally which the decking is adhesively bonded to the joists, no allowance by using Table NA.7 should be made for composite action unless the floor is designed in accordance with 9.1.2 and with adhesives meeting the requirements of 3.6 and the detailing and control provisions of 10.3 NA.2.8 Lateral load-carrying capacity of nails in end grain [BS EN 1995-1-1:2004 +A1:2008 , 8.3.1.2(4)] â BSI2012 2009 ã ã â The British Standards Institution The application rules of BS EN 1995-1-1:2004 +A1:2008 , 8.3.1.2(4) should be used to determine the lateral load-carrying capacity of nails /2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 In calculating the equivalent stiffness (EI ) of floors, in special investigation is made.plate In BSbending EN 1995-1-1 expression 7.5 the whichofthe is adhesively bonded to actions the joists, nowithout allowance mass thedecking floor should be the permanent only should be made for composite action unless the floor is designed in including partition loads or any variable actions NA to BS EN 1995-1-1:2004+A1:2008 accordance with 9.1.2 and with adhesives meeting the requirements In 3.6 calculating equivalent plate bending stiffness (EI ) of floors, in of and the the detailing and control provisions of 10.3 which the decking is adhesively bonded to the joists, no allowance should be made for composite action unless the floor is designed in NA.2.8 Lateral load-carrying capacity of nails in end accordance with 9.1.2 and with adhesives meeting the requirements grain [BS 1995-1-1:2004 +A1:2008 of 3.6 and theEN detailing and control provisions of 10.3., 8.3.1.2(4)] NA.2.8 NA.2.9 NA.2.9 NA.2.10 The application rules of BS EN 1995-1-1:2004 +A1:2008 , 8.3.1.2(4) should be used to determine thecapacity lateral load-carrying capacity of nails Lateral load-carrying of nails in end in end grain grain [BS EN 1995-1-1:2004 +A1:2008 , 8.3.1.2(4)] The application rules of BS EN 1995-1-1:2004 +A1:2008 , 8.3.1.2(4) Species sensitive to splitting in nailed joints should be used to determine the lateral load-carrying capacity of nails [BS in end EN grain.1995-1-1:2004 +A1:2008 , 8.3.1.2(7)] The application rules of BS EN 1995-1-1:2004 +A1:2008 , 8.3.1.2(7) should not besensitive applied to nailed joints Species to splitting in nailed joints [BS EN 1995-1-1:2004 +A1:2008 , 8.3.1.2(7)] Racking resistance of wall diaphragms The application rules of BS EN 1995-1-1:2004 +A1:2008 , 8.3.1.2(7) [BS EN 1995-1-1:2004 +A1:2008 , 9.2.4.1(7)] should not be applied to nailed joints wall diaphragms down toshould underlying timber by TheFor racking resistance offully wall held diaphragms be evaluated construction or foundationsof at their by tiedowns, Method A Method B resistance Racking wallends diaphragms should be used For wall diaphragms connected to underlying [BS EN 1995-1-1:2004 , 9.2.4.1(7)] +A1:2008 NOTE PD 6693-1-1 is currently under development is anticipated timber construction or foundations by bottom railItconnections or a that it will include an alternative to Method B, based on Method A. The racking resistance wall diaphragmsand should be evaluated by combination of bottomofrail connections tiedowns, the method Method given in B PD 6693-1:2012, Clause 21, should be used in preference NA.2.11 to Modification Method B. factors for bracing systems NA.2.10 NOTE PD 6693-1-1 is currently under development It is anticipated [BS 1995-1-1:2004 , 9.2.5.3(1)] Text deleted that it EN will include an alternative to+A1:2008 Method B, based on Method A. NA.2.11 BS EN 1995-1-1:2004 +A1:2008 , Table 9.2 is implemented nationally by using Table NA.7factors Modification for bracing systems [BS EN 1995-1-1:2004 +A1:2008 , 9.2.5.3(1)] NA to BS EN 1995-1-1:2004+A1:2008 BS EN 1995-1-1:2004 +A1:2008 , Table 9.2 is implemented nationally by using Table NA.7 Table NA.7 Values of modification factors for bracing systems Modification factor ks kf,1 60 kf,2 100 â BSI 2009 ã â BSI 2009 • 50 (members spaced at u 600 mm) 40 (members spaced at > 600 mm) kf,3 NA.2.12 Value Erection tolerances for trusses: maximum bow [BS EN 1995-1-1:2004 +A1:2008 , 10.9.2(3)] The maximum bow permitted in any truss member after erection should be 10 mm NA.2.13 Erection tolerances for trusses: maximum deviation from vertical alignment [BS EN 1995-1-1:2004 +A1:2008 , 10.9.2(4)] The maximum permitted deviation (in mm) of a truss, adev,perm, from true vertical alignment is given in Equation NA.2 ⎧ 10 + ( H – ) ⎩ 25 a dev,perm = (NA.2) ã â The British Standards Institution 2012 where controlled Copy, (c) The British Standards Institution 2012 Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The Briti [BS EN 1995-1-1:2004 +A1:2008 , 10.9.2(3)] The maximum bow permitted anyEN truss member after erection should NA to in BS 1995-1-1:2004+A1:2008 be 10 mm NA.2.13 Erection tolerances for trusses: maximum deviation from vertical alignment [BS EN 1995-1-1:2004 +A1:2008 , 10.9.2(4)] The maximum permitted deviation (in mm) of a truss, adev,perm, from true vertical alignment is given in Equation NA.2 ⎧ 10 + ( H – ) a dev,perm = ⎨ ⎩ 25 (NA.2) where H is the height of truss (m) NA.3 Guidance on using informative annexes NA.3.1 Block shear and shear plug failure at multiple dowel-type steel-to-timber connections [BS EN 1995-1-1:2004 +A1:2008 , Annex A] BS EN 1995-1-1:2004 +A1:2008 , Annex A should only be used for connections containing 10 or more dowel-type fasteners of diameter u mm in line parallel to grain or containing or more dowel-type fasteners of diameter > mm in line parallel to grain NA.3.2 Mechanically jointed beams [BS EN 1995-1-1:2004 +A1:2008 , Annex B] BS EN 1995-1-1:2004 +A1:2008 , Annex B may be used NA.3.3 Built-up columns [BS EN 1995-1-1:2004 +A1:2008, Annex C] NA to BS EN 1995-1-1:2004+A1:2008 BS EN 1995-1-1:2004 +A1:2008 , Annex C may be used • © BSI 2009 NA.4 Reference to non-contradictory complementary information The following reference contains non-contradictory complementary information for use with BS EN 1995-1-1:2004+A1:2008. P D 6693-1:2012, Guidance to Eurocode 5: Design of timber PD 6693-1-1, Guidance to Eurocode 5: Design of timber structures – Part 1: General – Common rules rules rules for buildings structures — Part 1: General — and Common and rules for (In preparation.) buildings. © The British Standards Institution 2012 • Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 NA to toBS BSEN EN 1995-1-1:2004+A1:2008 NA 1995-1-1:2004+A1:2008 Bibliography Standards publications For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies PD 6693-1:2012, Guidance to Eurocode 5: Design of timber PD 6693-1-1, Guidance to Eurocode 5: Design of timber structures – Part 1: General – Common rules rules rules for buildings structures — Part 1: General — and Common and rules for (In preparation.) buildings BS EN 1990:2002, Eurocode – Basis of structural design BS EN 1991 (all parts), Eurocode Actions on structures 8 ãã â â BSI The2009 British Standards Institution 2012 Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 NA NA to BS EN 1995-1-1:2004+A1:2008 to BS EN 1995-1-1:2004+A1:2008 This page deliberately left blank Licensed Copy: Ms Jacqueline Burman, British Standards Institution, 15/02/2012 10:25, Uncontrolled Copy, (c) The British Standards Institution 2012 BS EN EN 1995-1-1:2004 1995-1-1:2004+A1:2008 NA to BS +A1:2008 BSI – British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: +44 (0)20 8996 9000 Fax: +44 (0)20 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001 Email: orders@bsi-global.com Standards are also available from the BSI website at http://www.bsi-global.com In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: +44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048 Email: info@bsi-global.com Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: membership@bsi-global.com Information regarding online access to British Standards via British Standards Online can be found at http://www.bsi-global.com/bsonline Further information about BSI is available on the BSI website at http://www.bsi-global.com Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained 389 Chiswick High Road London W4 4AL Details and advice can be obtained from the Copyright & Licensing Manager Tel: +44 (0)20 8996 7070 Fax: +44 (0)20 8996 7553 Email: copyright@bsi-global.com