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26/30500225 DC NA TO BS EN 1990-1. UK Basis of structural and geotechnical design - New structures, 2026
- Where websites and webpages have been cited, they are provided for ease of reference and are correct at the time of publication. The location of a webpage or website, or its contents, cannot be guaranteed.
- National Annex to BS EN 1990-1:2023+A1:2026, Eurocode: Basis of structural and geotechnical design − Part 1: New structures
- NA.1 Scope
- NA.2 Nationally determined parameters [Go to Page]
- NA.2.1 General [Go to Page]
- NA.2.1.1 4.2(3) Target reliability levels
- NA.2.1.2 4.3(1) Qualification of consequence classes
- NA.2.1.3 4.4(2) Measures to enhance structural robustness
- NA.2.1.4 4.7(1) Supplementary requirements for sustainability in the design
- NA.2.1.5 6.1.3.2(4) Characteristic value of water actions
- NA.2.1.6 6.1.3.2(4) Frequent value of water actions
- NA.2.1.7 6.1.3.2(4) Quasi-permanent value of water actions
- NA.2.1.8 6.1.3.2(6) Accidental value of water actions
- NA.2.1.9 7.1.5(7) Duration of fire exposure
- NA.2.1.10 8.3.2.1(4) Partial factors applied to effects of actions
- NA.2.1.11 8.3.3.1(5) Reduction factor for stabilising permanent actions
- NA.2.1.12 8.3.3.6(1) Fatigue actions
- NA.2.1.13 8.3.4.2(2) Formula for combination of actions for persistent and transient design situations
- NA.2.1.14 8.3.4.2(2) Reduction factor for permanent actions
- NA.2.2 Annex A.1 General application and application for buildings [Go to Page]
- NA.2.2.1 A.1.3(1) Consequence classes
- NA.2.2.2 A.1.4(1) Design service life
- NA.2.2.3 A.1.6.1(1) Formula for combination of actions for persistent and transient design situations
- NA.2.2.4 A.1.6.1(1) Reduction factor for permanent actions
- NA.2.2.5 A.1.6.1(1) Coefficient for the main accompanying variable action in the accidental design situation
- NA.2.2.6 A.1.6.3(1) Combination factors
- NA.2.2.7 A.1.7(1) Partial factors on actions
- NA.2.2.8 A.1.7(1) Consequence factors
- NA.2.2.9 A.1.8.1(1) Limiting values of serviceability criteria
- NA.2.2.10 A.1.8.2.2(2) Maximum vertical deflections
- NA.2.2.11 A.1.8.2.3(2) Maximum horizontal displacements
- NA.2.2.12 A.1.8.3(1) Aspects to consider for vibration behaviour
- NA.2.2.13 A.1.8.3(3) Acceleration limits for buildings
- NA.2.2.14 A.1.8.3(4) Limiting values for dynamic response
- NA.2.2.15 A.1.8.4(2) Buildings in different structural sensitivity classes
- NA.2.2.16 A.1.8.4(4) Maximum permitted differential settlement
- NA.2.2.17 A.1.8.4(4) Maximum permitted angular distortion
- NA.2.2.18 A.1.8.4(4) Maximum permitted tilt
- NA.2.3 Annex A.2 Application for bridges [Go to Page]
- NA.2.3.1 A.2.3(1) Consequence classes
- NA.2.3.2 A.2.4(1) Design service life
- NA.2.3.3 A.2.7.1(1) Formula for combination of actions for persistent and transient design situations
- NA.2.3.4 A.2.7.1(1) Coefficient for the main accompanying variable action in the accidental design situation
- NA.2.3.5 A.2.7.1(1) Reduction factor for permanent actions
- NA.2.3.6 A.2.7.3.6(1) Actions outside the scope of BS EN 1991
- NA.2.3.7 A.2.7.4.1(1) Combination factors for road bridges
- NA.2.3.8 A.2.7.4.1(1) Combination rules for special vehicles
- NA.2.3.9 A.2.7.4.3(1) Combination of traffic load on bridge deck and behind abutment
- NA.2.3.10 A.2.7.4.5(1) Combinations of wind and thermal actions for road bridges
- NA.2.3.11 A.2.7.4.6(1) Combinations of snow and traffic for road bridges
- NA.2.3.12 A.2.7.4.6(1) Combinations of snow and traffic for road bridges
- NA.2.3.13 A.2.7.5.1(1) Combination factors for footbridges
- NA.2.3.14 A.2.7.5.3(1) Combinations of wind and thermal actions for footbridges
- NA.2.3.15 A.2.7.5.4(1) NOTE 1 Combinations of snow and traffic for footbridges
- NA.2.3.16 A.2.7.5.4(1) NOTE 2 Combinations of snow and traffic for footbridges
- NA.2.3.17 A.2.7.5.1(1) Combination factors for railway bridges
- NA.2.3.18 A.2.7.6.4(1) Combination rules for railway bridges – Combinations involving snow
- NA.2.3.19 A.2.7.10(5) Limiting movement at an integral abutment
- NA.2.3.20 A.2.7.10(5) Combination to which limiting abutment movement applies
- NA.2.3.21 A.2.7.10(9) Combination rules for traffic and enhanced earth pressures on abutments
- NA.2.3.22 A.2.8(1) Partial factors on actions
- NA.2.3.23 A.2.8(1) Consequence factors
- NA.2.3.24 A.2.9.1(1) Serviceability criteria – General
- NA.2.3.25 A.2.9.3.1(5) Approach for the assessment of vibrations on footbridges
- NA.2.3.26 A.2.9.3.3(1) Critical vertical natural frequency limits for footbridges
- NA.2.3.27 A.2.9.3.3(3) Critical lateral / torsional natural frequency limits for footbridges
- NA.2.3.28 A.2.9.3.3(4) Critical vertical natural frequency limits for footbridges for joggers
- NA.2.3.29 A.2.9.4.1(1) NOTE 3 Deformation and vibration requirements for temporary railway bridges
- NA.2.3.30 A.2.9.4.1(1) NOTE 4 Special requirements for temporary railway bridges
- NA.2.3.31 A.2.9.4.2.1(3) Criteria for traffic safety – Vertical acceleration of the deck
- NA.2.3.32 A.2.9.4.2.2(4) Deck twist
- NA.2.3.33 A.2.9.4.2.2(5) Total deck twist
- NA.2.3.34 A.2.9.4.2.3(1) Vertical deformation of the deck
- NA.2.3.35 A.2.9.4.2.3(1) Additional limits of angular rotations at the end of decks
- NA.2.3.36 A.2.9.4.2.4(2) NOTE 2 Transverse deformation and vibration of the deck
- NA.2.3.37 A.2.9.4.2.4(2) NOTE 3 Maximum differential transverse deflection
- NA.2.3.38 A.2.9.4.2.4(2) Minimum lateral frequency for railway bridges
- NA.2.3.39 A.2.9.5(1) Limiting values for foundation movement for bridges
- NA.2.3.40 A.2.10(1) Partial factor for fatigue actions
- NA.2.3.41 A.2.11.1(9) Actions to be considered for the stay cable/hanger replacement
- NA.2.3.42 A.2.11.4.5(3) Guidance on expansion joint supporting members
- NA.2.3.43 A.2.11.4.7(1) Format for expansion joint schedule
- NA.2.4 Annex A.3 Application for towers, masts and chimneys
- NA.2.5 Annex A.4 Application for silos and tanks
- NA.2.6 Annex A.5 Application for structures supporting cranes or other machines
- NA.2.7 Annex A.6 Application for coastal structures
- NA.2.8 Annex B.2(1), B.4(2), B.5(1), B.6(1), B.6(2), B.7(1), B.8(1)
- NA.2.9 Annex C.3 Basis for reliability analysis and partial factor design [Go to Page]
- NA.2.9.1 C.3.1(5) Conditions for use of reliability-based methods
- NA.2.9.2 C.3.4.2(3) Criterion for reliability-based design and assessment
- NA.2.10 Annex G.2 Scope and field of application [Go to Page]
- NA.2.10.1 G.2(1) Minimum requirements for additional or amended provisions for bearings in structures other than bridges
- NA.2.11 Annex G.3 General rules [Go to Page]
- NA.2.11.1 G.3.1(6) Criteria under which tensile forces are permitted in bearings and support systems
- NA.2.11.2 G.3.3.2(1) Format for bearing schedule
- NA.2.11.3 G.3.3.2(2) Combination for sizing the sliding plate
- NA.2.11.4 G.3.4(2) Lifting clearance for replacement of bearings
- NA.2.11.5 G.3.4(3) Actions to be considered for jacking force
- NA.2.12 Annex G.6 Structural analysis – Effects of deformation of piers and abutments [Go to Page]
- NA.2.12.1 G.6(2) Reduction factor for pier and abutment geometric imperfections kφ
- NA.2.13 Annex G.7 Verification by the partial factor method [Go to Page]
- NA.2.13.1 G.7.1.2(2) Model factor for sliding resistance
- NA.2.13.2 G.7.1.3(2) Model factor for shear resistance
- NA.2.13.3 G.7.3.2(2) Upper and lower values for shear modulus
- NA.2.13.4 G.7.4.2(1) Geometric uncertainty on bearing position ∆d
- NA.2.13.5 G.7.5.1(1) Applicable combination of actions for vertical force on bearing
- NA.2.13.6 G.7.5.2(1) NOTE 1 Applicable combination of actions for unfavourable friction force
- NA.2.13.7 G.7.5.2(1) NOTE 2 Applicable combination of actions for favourable friction force
- NA.3 Decisions on the status of informative annexes [Go to Page]
- NA.3.1 Annex B, Technical management measures for design and execution
- NA.3.2 Annex C, Reliability analysis and code calibration
- NA.3.3 Annex D, Design assisted by testing
- NA.3.4 Annex E, Additional guidance for enhancing the robustness of buildings and bridges
- NA.3.5 Annex F, Rain-flow and reservoir counting methods for the determination of stress ranges due to fatigue
- NA.3.6 Annex H, Verifications concerning vibration of footbridges due to pedestrian traffic
- NA.4 Complementary information [Go to Page]
- NA.4.1 6.1.3.2(1) Water actions
- NA.4.2 A.2.3(1) Consequence classes
- NA.4.3 A.2.7.3.1(1) General combination rules – Specific design situations
- NA.4.4 G.2(1) Use of Annex G, basis of design for bearings, for structures other than bridges
- NA.4.5 G.5.1 Combinations of actions for bearing forces
- NA.4.6 G.7.5.3 Intermediate elastic fixed point, other piers free
- NA.4.7 Complementary information
- Annex NA.E Additional guidance for enhancing the robustness of buildings and bridges
- NA.E.1 Use of this annex
- NA.E.2 Scope and field of application
- NA.E.3 Design strategies
- NA.E.4 Design methods
- Annex NA.H Verifications concerning vibration of footbridges due to pedestrian traffic
- NA.H.1 Use of this annex
- NA.H.2 Scope and field of application
- NA.H.3 Dynamic load models and traffic classes
- NA.H.4 Comfort criteria and design situations
- NA.H.4.1 General
- NA.H.4.2 Vertical acceleration limit
- NA.H.4.3 Horizontal acceleration limit
- NA.H.5 Vibration control devices
- Annex NA.I Partial factors on actions
- NA.I.1 Use of this annex
- NA.I.2 Scope and field of application
- NA.I.3 General application and application for buildings
- NA.I.4 Application for bridges [Go to Page]
