1、NA to BS EN 1993-1-9:2005UK National Annex to Eurocode 3: Design of steel structures Part 1-9: FatigueICS 91.010.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWNATIONAL ANNEXLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 30/07/2008 08:14, Uncontrolled Copy, (c) BSIPu
2、blishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2008ISBN 978 0 580 54971 7The following BSI references relate to the work on this standard:Committee reference B/525/10 and B/525/31Draft for comment 07/30128138 DCP
3、ublication historyFirst published May 2008Amendments/corrigenda issued since publicationDate Text affectedNA to BS EN 1993-1-9:2005Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 30/07/2008 08:14, Uncontrolled Copy, (c) BSI BSI 2008 iNA to BS EN 1993-1-9:2005ContentsIntroduction 1NA.1 Scope 1
4、NA.2 Nationally Determined Parameters 1NA.3 References to non-contradictory complementary information 5Bibliography 6List of tablesTable NA.1 Minimum required fatigue strength 2Table NA.2 Recommended *Fffor safe life design 3Summary of pagesThis document comprises a front cover, an inside front cove
5、r, pages i and ii, pages 1 to 6, an inside back cover and a back cover.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 30/07/2008 08:14, Uncontrolled Copy, (c) BSINA to BS EN 1993-1-9:2005ii BSI 2008 This page deliberately left blankLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 30/07
6、/2008 08:14, Uncontrolled Copy, (c) BSI BSI 2008 1NA to BS EN 1993-1-9:2005National Annex (informative) to BS EN 1993-1-9:2005, Eurocode 3 Design of steel structures Part 1-9: FatigueIntroductionThis National Annex has been prepared by BSI Subcommittee B/525/10, Bridges, in consultation with B/525/3
7、1, Structural use of steel. In the UK it is to be used in conjunction with BS EN 1993-1-9:2005.NA.1 ScopeThis National Annex gives:a) the UK decisions for the Nationally Determined Parameters described in the following clauses and subclauses of BS EN 1993-1-9:2005: 1.1(2)Clause 2(2)Clause 2(4)Clause
8、 3(2)Clause 3(7)Clause 5(2) 6.1(1) 6.2(2) 7.1(3) 7.1(5)Clause 8(4)b) references to non-contradictory complementary information.NA.2 Nationally Determined ParametersNA.2.1 Material and execution tolerances and information on inspection requirements for fabrication BS EN 1993-1-9:2005, 1.1(2)NA.2.1.1
9、Material and execution tolerancesUntil such time as BS EN 1090-2 is published, the rules are applicable to structures where execution conforms to either BS 5400-6:1999 for bridges or BS 5950-2:2001 for buildings. Note that, where BS 5400-6:1999 makes reference to minimum class requirements D, E and
10、F, Unspecified, these may be taken to refer to a minimum requirement for the value of %c= 91 N/mm2, 80 N/mm2, 63 N/mm2and 56 N/mm2respectively. For additional guidance see NA.3.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 30/07/2008 08:14, Uncontrolled Copy, (c) BSINA to BS EN 1993-1-9:200
11、52 BSI 2008NA.2.1.2 Information on inspection requirements for fabricationFor the safe life method of assessment, special inspection and testing requirements for welds, cut edges and plain surfaces should be provided on drawings for all applications where the minimum required fatigue strength exceed
12、s the relevant value of cin Table NA.1.For additional guidance see NA.3.NA.2.2 Fatigue loading models BS EN 1993-1-9:2005, Clause 2(2)NA.2.2.1 Sources of fatigue loadingAll sources of fluctuating stress in the structure should be identified and should be obtained from the relevant parts of BS EN 199
13、1. For fatigue loading not covered in BS EN 1991 the following should receive particular attention:a) superimposed moving loads, including vibrations from machinery in stationary structures;b) environmental loads such as wind, waves, etc.;c) acceleration forces in moving structures;d) temperature ch
14、anges.Where no published data for live loading exist, the partial safety factors for fatigue load intensity for safe life design should take into account the degree of confidence in the prediction of the design load spectrum from the available data. Recommended values of Ffare given in Table NA.2.Ta
15、ble NA.1 Minimum required fatigue strengthDetail type according to BS EN 1993-1-9 Fatigue strength levels, c Table Detail numbers N/mm28.1 1, 2, 3, 4 1258.2 1, 2, 3, 4, 5, 6, 7, 10, 11 908.31, 2, 4, 5, 7, 19 808, 10 713, 6 638.4 4 808.8 5 80NOTE Minimum required fatigue strength is the value of c th
16、at would just achieve compliance with BS EN 1993-1-9:2005, Clause 8.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 30/07/2008 08:14, Uncontrolled Copy, (c) BSI BSI 2008 3NA to BS EN 1993-1-9:2005Reference to guidance on determination of specific fatigue loading models is given in NA.3.NA.2.3
17、 Determination of fatigue strength from tests BS EN 1993-1-9:2005, Clause 2(4)Reference to guidance on determination of specific fatigue strength data from tests is given in NA.3.NA.2.4 Provisions for in-service inspection programmes BS EN 1993-1-9:2005, Clause 3(2)In the event that the damage toler
18、ant assessment method is to be used, the following provisions apply.a) The designer should be satisfied that the Maintaining Authority for the structure is aware of the practical requirements and the likely costs of provision of access, the inspection itself, possible repair and temporary loss of se
19、rvice, prior to approval being given.b) Any potential fatigue crack initiation sites should be on or close to a surface which will be readily accessible in service.c) The method or methods of inspection should be specified for each potential fatigue initiation site. Inspection for fatigue cracking r
20、equires more sophisticated techniques than are used for normal principal inspections.d) The minimum size of detectable fatigue crack should be specified for each initiation site, taking into account the capability of the methods in c).e) The maximum tolerable size of fatigue crack (using fracture me
21、chanics) for fracture under ULS loading should be calculated.f) The time taken for the fatigue crack to grow from the minimum detectable size in d) to the fracture tolerable size in e) should be calculated by fracture mechanics using upper bound crack growth data and the upper bound fatigue loading.
22、 g) The maximum interval between inspections should be not more than half the time calculated in f). This may be less than the interval between principal inspections.h) Guidance should be given on any requirements for taking the structure out of service or increasing the inspection frequency in the
23、event that cracks are detected.Table NA.2 Recommended Fffor safe life designNumber of standard deviations on load intensityValue of Ff0 standard deviations A)+2 standard deviations A)01,5 1,4+1 1,3 1,2+2 1,1 1,0A)Number of standard deviations on number of cycles.Licensed Copy: Wang Bin, ISO/EXCHANGE
24、 CHINA STANDARDS, 30/07/2008 08:14, Uncontrolled Copy, (c) BSINA to BS EN 1993-1-9:20054 BSI 2008i) Viable schemes should be drawn up for repair, strengthening or replacement of the member where fatigue cracks have been detected.j) A maintenance manual should be provided to the maintaining authority
25、 at the time of commissioning of the structure, giving details of the items in c), g), h) and i).NA.2.5 Assessment method, definition of class of consequence and partial factor for fatigue strength BS EN 1993-1-9:2005, Clause 3(7)NA.2.5.1 Assessment methodSteel structures subject to fatigue loading
26、should be assessed using the safe life method, unless otherwise agreed with the Maintaining Authority.NA.2.5.2 Classes of consequencesUnless otherwise specified in the project specification, all steel structures subjected to fatigue should be consequence class CC2 according to BS EN 1990:2002, Annex
27、 B. If consequence class CC1 or CC3 is specified, the appropriate KF1factors should also be applied. The values in BS EN 1990:2002, Annex B are recommended.NA.2.5.3 Partial factor for fatigue strengthFor steel structures assessed for safe life using the detail categories given in BS EN 1993-1-9:2005
28、, Tables 8.1 to 8.10, and the fatigue loading in BS EN 1991-2, a value of Mf= 1.1 should be used irrespective of consequence class in BS EN 1990:2002. For additional guidance see NA.3.NA.2.6 Stress limitations for Class 4 sections BS EN 1993-1-9:2005, Clause 5(2)The effects of excessive repeated non
29、-linear out of plane deflection in flat panels might be neglected if the slenderness of plates meets criterion (2) of BS EN 1993-2:2006, 7.4.NA.2.7 Use of nominal, modified nominal and geometric stress ranges BS EN 1993-1-9:2005, Clause 6.1(1)Reference to guidance on determination of stress ranges i
30、s given in NA.3.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 30/07/2008 08:14, Uncontrolled Copy, (c) BSI BSI 2008 5NA to BS EN 1993-1-9:2005NA.2.8 Design value of nominal stress range BS EN 1993-1-9:2005, Clause 6.2(2)Where no ivalues are given it is not possible to calculate the value of
31、 E,2. In such cases the verification format should be based on damage accumulation equation A.1, given in BS EN 1993-1-9:2005, A.5(1), and damage accumulation expression A.2, given in BS EN 1993-1-9:2005, A.6(1), using the most comprehensive load model available. For additional guidance see NA.3.NA.
32、2.9 Verification of fatigue strength category BS EN 1993-1-9:2005, Clause 7.1(3)Verification of a fatigue strength category for a particular application by testing is permitted provided that it is evaluated in accordance with BS EN 1993-1-9:2005, 7.1(3), Note 1. For additional guidance see NA.3.NA.2
33、.10 Fatigue strength categories for details not covered by Tables 8.1 to 8.10 or Annex B BS EN 1993-1-9:2005, Clause 7.1(5)Fatigue strength categories for details not covered by BS EN 1993-1-9 should be given for individual projects.NA.2.11 Use of Annex A BS EN 1993-1-9:2005, Clause 8(4)NA.2.11.1 Lo
34、ading eventsReference to guidance on determining fatigue loading models is given in NA.3.NA.2.11.2 Cycle countingReference to guidance on the procedure for cycle counting by the reservoir method is given in NA.3.NA.3 References to non-contradictory complementary informationComplementary guidance on
35、fatigue is given in PD 6695-1-9.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 30/07/2008 08:14, Uncontrolled Copy, (c) BSINA to BS EN 1993-1-9:20056 BSI 2008BibliographyFor dated references, only the edition cited applies. For undated references, the latest edition of the referenced documen
36、t (including any amendments) applies.BS 5400-6:1999, Steel, concrete and composite bridges Part 6: Specification for materials and workmanship, steelBS 5950-2:2001, Structural use of steelwork in building Part 2: Specification for materials, fabrication and erection Rolled and welded sectionsPD 6695
37、-1-9, Recommendations for the design of structures to BS EN 1993-1-9BS EN 1990:2002, Eurocode Basis of structural designBS EN 1991, Eurocode 1 Actions on structuresBS EN 1993-2:2006, Eurocode 3 Design of steel structures Part 2: Steel bridgesLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 30/
38、07/2008 08:14, Uncontrolled Copy, (c) BSIThis page deliberately left blankNA to BS EN 1993-1-9:2005Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 30/07/2008 08:14, Uncontrolled Copy, (c) BSIBSI British Standards InstitutionBSI is the independent national body responsible for preparing Britis
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