1、NA to BS EN 1995-2:2004UK National Annex to Eurocode 5: Design of timber structures Part 2: BridgesICS 91.010.30; 91.080.20; 93.040NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWNATIONAL ANNEXLicensed Copy: Wang Bin, na, Fri Feb 02 07:25:10 GMT+00:00 2007, Uncontrolled Copy, (
2、c) BSIPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2006ISBN 0 580 49351 2The following BSI references relate to the work on this standard:Committee reference B/525/5Draft for comment 05/30128368Publication hi
3、storyFirst edition, October 2006Amendments issued since publicationAmd. no. Date Text affectedNA to BS EN 1995-2:2004Licensed Copy: Wang Bin, na, Fri Feb 02 07:25:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2006 iNA to BS EN 1995-2:2004ContentsIntroduction 1NA.1 Scope 1NA.2 Nationally Determin
4、ed Parameters 1NA.3 Guidance on the use of informative annexes 3NA.4 Reference to non-contradictory complementary information 3Bibliography 4List of tablesTable NA.1 Partial factors Mfor material properties 2Table NA.2 Limiting values for deflections of beams and trusses 2Summary of pagesThis docume
5、nt comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover.Licensed Copy: Wang Bin, na, Fri Feb 02 07:25:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSINA to BS EN 1995-2:2004ii BSI 2006 This page deliberately left blankLicensed Copy: Wang Bi
6、n, na, Fri Feb 02 07:25:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2006 1NA to BS EN 1995-2:2004National Annex NA (informative) to BS EN 1995-2:2004, Eurocode 5: Design of timber structures Part 2: BridgesIntroductionThis National Annex has been prepared by BSI Subcommittee B/525/5, Structura
7、l use of timber. In the UK it is to be used in conjunction with BS EN 1995-2 for the structural design of timber bridges, together with BS EN 1995-1-1, BS EN 1990 and BS EN 1991 and their respective National Annexes.NA.1 ScopeThis National Annex gives:a) the UK decisions for the Nationally Determine
8、d Parameters described in the following subclauses of BS EN 1995-2:2004: 2.3.1.2(1) 2.4.1 7.2 7.3.1(2)b) the UK decisions on the status of BS EN 1995-2:2004 informative annexes;c) reference to non-contradictory complementary information.NA.2 Nationally Determined ParametersNA.2.1 Assignment of loads
9、 to load-duration classes BS EN 1995-2:2004, 2.3.1.2(1)Variable actions due to the passage of vehicular and pedestrian traffic should be regarded as short-term actions.Actions occurring during erection should be regarded as short-term actions.Licensed Copy: Wang Bin, na, Fri Feb 02 07:25:10 GMT+00:0
10、0 2007, Uncontrolled Copy, (c) BSINA to BS EN 1995-2:20042 BSI 2006NA.2.2 Partial factors for material properties BS EN 1995-2:2004, 2.4.1BS EN 1995-2:2004, Table 2.1 is implemented nationally by using Table NA.1.NA.2.3 Limiting values for deflections BS EN 1995-2:2004, 7.2BS EN 1995-2:2004, Table 7
11、.1 is implemented nationally by using Table NA.2.NA.2.4 Damping ratios BS EN 1995-2:2004, 7.3.1(2)Where no other values have been verified, the damping ratio () should be taken as: = 0,010 for structures without mechanical joints; = 0,015 for structures with mechanical joints.Table NA.1 Partial fact
12、ors Mfor material propertiesFundamental combinations Solid timber untreated M= 1,3Solid timber preservatively treated M= 1,3Glued laminated timber M= 1,25LVL, plywood, OSB M= 1,2Connections M= 1,3Shear connectors between timber and concrete in composite members M,v= 1,25Steel used in composite membe
13、rs M,s= 1,15Pre-stressing steel elements M,s= 1,15Concrete used in composite members M,c= 1,5Fatigue combinations Timber and wood-based materials M,fat= 1,0Connections M,fat= 1,0Shear connectors between timber and concrete in composite members M,v,fat= 1,0Accidental combinations All materials M,acc=
14、 1,0Table NA.2 Limiting values for deflections of beams and trussesActionLimiting value for deflections in beams and trusses of span, lCharacteristic traffic load l/400Pedestrian load and low traffic load l/200Licensed Copy: Wang Bin, na, Fri Feb 02 07:25:10 GMT+00:00 2007, Uncontrolled Copy, (c) BS
15、I BSI 2006 3NA to BS EN 1995-2:2004NA.3 Guidance on the use of informative annexesNA.3.1 Fatigue verification BS EN 1995-2:2004, Annex ABS EN 1995-2:2004, Annex A may be used.NA.3.2 Vibrations caused by pedestrians BS EN 1995-2:2004, Annex BBS EN 1995-2:2004, Annex B may be used.NA.4 Reference to no
16、n-contradictory complementary information Material from BS 5268, Structural use of timberPD 6693, Complementary information for use with Eurocode 5, BSI, London. (Publication date to be announced.)Licensed Copy: Wang Bin, na, Fri Feb 02 07:25:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSINA to BS EN
17、1995-2:20044 BSI 2006BibliographyStandards publicationsFor dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS 5268, Structural use of timberPD 6693, Complementary information for use with Euroc
18、ode 5BS EN 1990:2002, Eurocode Basis of structural designBS EN 1991 (all parts), Eurocode 1 Actions on structuresBS EN 1995-1-1:2004, Eurocode 5 Design of timber structures Part 1-1: General Common rules and rules for buildingsLicensed Copy: Wang Bin, na, Fri Feb 02 07:25:10 GMT+00:00 2007, Uncontro
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