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NA to BS EN 1993-1-9:2005:2008 Edition

NA to BS EN 1993-1-9:2005:2008 Edition

$86.31

UK National Annex to Eurocode 3. Design of steel structures – Fatigue

Published By Publication Date Number of Pages
BSI 2008 12
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This National Annex gives:

  1. 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 3(2)
    • Clause 3(7)
    • Clause 5(2)
    • 6.1(1)
    • 6.2(2)
    • 7.1(3)
    • 7.1(5)
    • Clause 8(4)
  2. references to non-contradictory complementary information.

PDF Catalog

PDF Pages PDF Title
3 Contents
Introduction 1
NA.1 Scope 1
NA.2 Nationally Determined Parameters 1
NA.3 References to non-contradictory complementary information 5
Bibliography 6
List of tables
Table NA.1 – Minimum required fatigue strength 2
Table NA.2 – Recommended *Ff for safe life design 3
5 Introduction
NA.1 Scope
a) the UK decisions for the Nationally Determined Parameters described in the following clauses and subclauses of BS EN 1993-1-9:2005;
b) references to non-contradictory complementary information.
NA.2 Nationally Determined Parameters
NA.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 Material and execution tolerances
6 NA.2.1.2 Information on inspection requirements for fabrication
Table NA.1 Minimum required fatigue strength
NA.2.2 Fatigue loading models [BS EN 1993-1-9:2005, Clause 2(2)]
NA.2.2.1 Sources of fatigue loading
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 changes.
7 Table NA.2 Recommended gFf for safe life design
NA.2.3 Determination of fatigue strength from tests [BS EN 1993-1-9:2005, Clause 2(4)]
NA.2.4 Provisions for in-service inspection programmes [BS EN 1993-1-9:2005, Clause 3(2)]
a) The designer should be satisfied that the maintaining authority for the structure is aware of the practical requirements and …
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 requires 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 mechanics) 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.
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 event that cracks are detected.
8 i) 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 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 method
NA.2.5.2 Classes of consequences
NA.2.5.3 Partial factor for fatigue strength
NA.2.6 Stress limitations for Class 4 sections [BS EN 1993-1-9:2005, Clause 5(2)]
NA.2.7 Use of nominal, modified nominal and geometric stress ranges [BS EN 1993-1-9:2005, Clause 6.1(1)]
9 NA.2.8 Design value of nominal stress range [BS EN 1993-1-9:2005, Clause 6.2(2)]
NA.2.9 Verification of fatigue strength category [BS EN 1993-1-9:2005, Clause 7.1(3)]
NA.2.10 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)]
NA.2.11 Use of Annex A [BS EN 1993-1-9:2005, Clause 8(4)]
NA.2.11.1 Loading events
NA.2.11.2 Cycle counting
NA.3 References to non-contradictory complementary information
10 Bibliography

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