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1、NATIONAL ANNEX NA to BS EN 1991-1-1:2002 UK National Annex to Eurocode 1: Actions on structures Part 1-1: General actions Densities, self-weight, imposed loads for buildings ICS 91.010.30 NA to BS EN 1991-1-1:2002 This National Annex was published under the authority of the Standards Policy and Stra
2、tegy Committee on 30 December 2005 BSI 30 December 2005 First edition December 2005 The following BSI references relate to the work on this National Annex: Committee reference B/525/1 Draft for comment 03/700514 ISBN 0 580 47335 X Committees responsible for this British Standard The preparation of t
3、his National Annex was entrusted by Technical Committee B/525, Building and civil engineering structures, to Subcommittee B/525/1, Actions (loadings) and basis of design, upon which the following bodies were represented: Association of Consulting Engineers British Constructional Steelwork Associatio
4、n British Masonry Society Building Research Establishment Concrete Society Health and Safety Executive Highways Agency Institution of Civil Engineers Institution of Structural Engineers National House Building Council Office of the Deputy Prime Minister Steel Construction Institute Summary of pages
5、This document comprises a front cover, an inside front cover, page i, a blank page, pages 1 to 11 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No.DateComments NA to BS EN 1991-1-1:2002 BSI
6、30 December 2005 i Contents Page Committees responsibleInside front cover Introduction 1 NA.1 Scope 1 NA.2 Nationally Determined Parameters 1 NA.3 Decisions on the status of informative annexes 10 NA.4 References to non-contradictory complementary information 10 Bibliography 11 Table NA.1 Characteri
7、stic values of self-weight UK guidance on additional provisions for bridges 3 Table NA.2 Categories for residential, social, commercial and administration areas including additional sub-categories for the UK 4 Table NA.3 Imposed loads on floors, balconies and stairs in buildings 6 Table NA.4 Categor
8、ies for storage and industrial areas including additional sub-categories for the UK 7 Table NA.5 Imposed floor loads due to storage 7 Table NA.6 Imposed loads on garages and vehicle traffic areas 8 Table NA.7 Imposed loads on roofs not accessible except for normal maintenance and repair 8 Table NA.8
9、 Horizontal loads on partition walls and parapets 9 blank NA to BS EN 1991-1-1:2002 BSI 30 December 2005 1 National Annex (informative) to BS EN 1991-1-1:2002, Eurocode 1: Actions on structures Part 1-1: General actions Densities, self-weight, imposed loads for buildings Introduction This National A
10、nnex has been prepared by BSI Subcommittee B/525/1, Actions (loadings) and basis of design. In the UK it is to be used in conjunction with BS EN 1991-1-1:2002. NA.1 Scope This National Annex gives: a) the UK decisions for the Nationally Determined Parameters described in the following subclauses of
11、BS EN 1991-1-1:2002: 2.2 (3) 5.2.3 (1) to 5.2.3 (5) 6.3.1.1 (Table 6.1) 6.3.1.2 (1)P (Table 6.2) 6.3.1.2 (10) 6.3.1.2 (11) 6.3.2.2 (1)P (Table 6.4) 6.3.3.2 (1) (Table 6.8) 6.3.4.2 (Table 6.10) 6.4 (1) (Table 6.12) b) the UK decisions on the status of BS EN 1991-1-1:2002 informative annexes; and c) r
12、eferences to non-contradictory complementary information for the following subclauses of BS EN 1991-1-1:2002: 6.3.2.2 6.3.4.2 (1) NA.2 Nationally Determined Parameters NA.2.1 Dynamically susceptible structures BS EN 1991-1-1:2002, 2.2(3) NA.2.1.1 General The procedure to be used for structures that
13、are susceptible to dynamic excitation is outlined in NA.2.1.2, NA.2.1.3 and NA.2.1.4 for particular cases of dynamic loading conditions and structural types. In such cases, the design should take account of the load-structure interaction and dynamic characteristics of the structure, e.g. natural fre
14、quency, mass, damping and mode shapes. Furthermore, for structural design with oscillation or vibration as a serviceability criterion, separate consideration of their influence is necessary, e.g. on the operation of equipment in the building and/or on the comfort of the users and occupiers of the bu
15、ilding. In certain cases, e.g. structures intended primarily for providing spectator facilities, the relevant certifying authority may refer to specific guidance documents that are considered appropriate and sufficient for compliance with their requirements. NA.2.1.2 Synchronized rhythmical movement
16、s Structures with elements subject to dancing and jumping are liable to inadvertent or deliberate synchronized movement of occupants, sometimes accompanied by music with a strong beat, such as occurs at pop concerts and aerobics events. These activities generate dynamic effects that can result in en
17、hanced vertical and horizontal loads. If a natural frequency of a structure matches the frequency of the synchronized movement, or an integer multiple of it, then resonance can occur that greatly amplifies the dynamic response. NA to BS EN 1991-1-1:2002 2 BSI 30 December 2005 The following three alt
18、ernative procedures are recommended for such design situations. a) In addition to design using the dead and static imposed loads given for category C4 uses in Table NA.3, resonance of the structure should be avoided by limiting its natural frequencies so that the vertical frequency is greater than 8
19、,4 Hz and the horizontal frequency is greater than 4,0 Hz. These frequencies should be evaluated for the appropriate mode of vibration of an empty structure. b) Structural elements subject to dancing and jumping should be designed to resist the anticipated dynamic loading. The deformation should not
20、 exceed limits appropriate to the structure type. Detailed design should be carried out accounting for dynamic response of the structure and a range of load frequencies and types, and with the help of specialist advice and specialist guidance documents, e.g. BRE Digest 426, The response of structure
21、s to dynamic crowd loads 1. c) Specific guidance, as required by the certifying authority for the type of structure under consideration, should be used. NA.2.1.3 Dynamic loads from machinery Dynamic effects caused by the operation of machinery depend on the type of machinery and the structural form.
22、 Designers should seek specialist guidance and consider dynamic loads and potential resonant excitation of such structures. Guidance on actions induced by cranes and machinery is given in BS EN 1991-31). NA.2.1.4 Lightweight structures and long-span structures Where these structures are used as conc
23、ourses and public spaces, they are likely to be subject to inadvertent or deliberate synchronized movement by people, causing dynamic excitation. The design provisions should take account of the nature and intended use of the structure, the potential number of people and their possible behaviour. St
24、ructural design should be carried out with the help of specialist advice and specialist guidance documents. NA.2.2 Characteristic values of self-weight Additional provisions specific to bridges BS EN 1991-1-1:2002, 5.2.3 Additional provisions for bridges are given in BS EN 1991-1-1:2002, 5.2.3. The
25、UK guidance on these provisions is given in Table NA.1. NA.2.3 Categories for residential, social, commercial and administration areas BS EN 1991-1-1:2002, 6.3.1.1 The categories for residential, social, commercial and administration areas are given in BS EN 1991-1-1:2002, Table 6.1. These categorie
26、s have been expanded in Table NA.2 to include additional sub-categories for the UK. NA.2.4 Imposed loads on floors, balconies and stairs in buildings BS EN 1991-1-1:2002, 6.3.1.2 (1)P Values for minimum imposed loads on floors, balconies and stairs in buildings should be taken from Table NA.3 (as a
27、replacement for BS EN 1991-1-1:2002, Table 6.2) for the categories of residential, social, commercial and administration areas described in Table NA.2. NA.2.5 Reduction factor for imposed loads for floors and accessible roofs BS EN 1991-1-1:2002, 6.3.1.2 (10) The reduction factor A should be determi
28、ned using Equation (NA.1) instead of BS EN 1991-1-1:2002, Equation (6.1): where NOTE Loads that have been specifically determined from knowledge of the proposed use of the structure do not qualify for reduction. 1)In preparation. A = 1,0 A/1 000 0,75(NA.1) A is the area (m2) supported. NA to BS EN 1
29、991-1-1:2002 BSI 30 December 2005 3 Table NA.1 Characteristic values of self-weight UK guidance on additional provisions for bridges NA.2.6 Reduction factors for imposed loads from several storeys BS EN 1991-1-1:2002, 6.3.1.2 (11) The reduction factor n should be determined using Equation (NA.2) ins
30、tead of BS EN 1991-1-1:2002, Equation (6.2): where n is the number of storeys with loads qualifying for reduction (see Note). Load reductions based on area in NA.2.5 may be applied if A 10 Table NA.2 Categories for residential, social, commercial and administration areas including additional sub-cat
31、egories for the UK Category of loaded area Specific useSub-categoryExample AAreas for domestic and residential activities A1All usages within self-contained dwelling units (a unit occupied by a single family or a modular student accommodation unit with a secure door and comprising not more than six
32、single bedrooms and an internal corridor) Communal areas (including kitchens) in blocks of flats with limited use (see Note 1). For communal areas in other blocks of flats, see A5, A6 and C3 A2Bedrooms and dormitories except those in self-contained single family dwelling units and in hotels and mote
33、ls A3Bedrooms in hotels and motels; hospital wards; toilet areas A4Billiard/snooker rooms A5Balconies in single family dwelling units and communal areas in blocks of flats with limited use (see Note 1) A6Balconies in hostels, guest houses, residential clubs and communal areas in blocks of flats exce
34、pt those covered by Note 1 A7Balconies in hotels and motels BOffice areasB1General use other than in B2 B2At or below ground floor level CAreas where people may congregate (with the exception of areas defined under category A, B and D) C1Areas with tables C11Public, institutional and communal dining
35、 rooms and lounges, cafes and restaurants (see Note 2) C12Reading rooms with no book storage C13Classrooms C2Areas with fixed seats C21Assembly areas with fixed seating (see Note 3) C22Places of worship C3Areas without obstacles for moving people C31Corridors, hallways, aisles in institutional type
36、buildings not subjected to crowds or wheeled vehicles, hostels, guest houses, residential clubs, and communal areas in blocks of flats not covered by Note 1 Table NA.2 Categories for residential, social, commercial and administration areas including additional sub-categories for the UK (continued) C
37、ategory of loaded area Specific useSub-categoryExample C32Stairs, landings in institutional type buildings not subjected to crowds or wheeled vehicles, hostels, guest houses, residential clubs, and communal areas in blocks of flats not covered by Note 1 C33Corridors, hallways, aisles in all building
38、s not covered by C31 and C32, including hotels and motels and institutional buildings subjected to crowds C34Corridors, hallways, aisles in all buildings not covered by C31 and C32, including hotels and motels and institutional buildings subjected to wheeled vehicles, including trolleys C35Stairs, l
39、andings in all buildings not covered by C31 and C32, including hotels and motels and institutional buildings subjected to crowds C36Walkways Light duty (access suitable for one person, walkway width approx 600 mm) C37Walkways General duty (regular two-way pedestrian traffic) C38Walkways Heavy duty (
40、high density pedestrian traffic including escape routes) C39Museum floors and art galleries for exhibition purposes C4Areas with possible physical activities C41Dance halls and studios, gymnasia, stages (see Note 5) C42Drill halls and drill rooms (see Note 5) C5Areas susceptible to large crowds C51A
41、ssembly areas without fixed seating, concert halls, bars and places of worship (see Note 4 and Note 5) C52Stages in public assembly areas (see Note 5) DShopping areas D1Areas in general retail shops D2Areas in department stores NOTE 1 Communal areas in blocks of flats with limited use are blocks of
42、flats not more than three storeys in height and with not more than four self-contained dwelling units per floor accessible from one staircase. NOTE 2 Where the areas described by C11 might be subjected to loads due to physical activities or overcrowding, e.g. a hotel dining room used as a dance floo
43、r, imposed loads should be based on C4 or C5 as appropriate. Reference should also be made to Note 5. NOTE 3 Fixed seating is seating where its removal and the use of the space for other purposes is improbable. NOTE 4 For grandstands and stadia, reference should be made to the requirements of the ap
44、propriate certifying authority. NOTE 5 For structures that might be susceptible to resonance effects, reference should be made to NA.2.1. NA to BS EN 1991-1-1:2002 6 BSI 30 December 2005 Table NA.3 Imposed loads on floors, balconies and stairs in buildings Category of loaded areaqk kN/m2 Qk kN Categ
45、ory AA11,52,0 A21,52,0 A32,02,0 A42,02,7 A52,52,0 A6Same as the rooms to which they give access but with a minimum of 3,0 2,0 (concentrated at the outer edge) A7Same as the rooms to which they give access but with a minimum of 4,0 2,0 (concentrated at the outer edge) Category BB12,52,7 B23,02,7 Cate
46、gory CC112,03,0 C122,54,0 C133,03,0 C214,03,6 C223,02,7 C313,04,5 C323,04,0 C334,04,5 C345,04,5 C354,04,0 C363,02,0 C375,03,6 C387,54,5 C394,04,5 C415,03,6 C425,07,0 C515,03,6 C527,54,5 Category DD1/D24,03,6 NA to BS EN 1991-1-1:2002 BSI 30 December 2005 7 NA.2.7 Categories for storage and industria
47、l areas BS EN 1991-1-1:2002, 6.3.2.1 (1)P The categories for storage and industrial areas are given in BS EN 1991-1-1:2002, Table 6.3. These categories have been expanded in Table NA.4 to include additional sub-categories for the UK. Table NA.4 Categories for storage and industrial areas including a
48、dditional sub-categories for the UK NA.2.8 Imposed loads on floors due to storage BS EN 1991-1-1:2002, 6.3.2.2 (1)P Values for imposed loads on floors due to storage should be taken from Table NA.5 (as a replacement for BS EN 1991-1-1:2002, Table 6.4) for the sub-categories of E1 described in Table
49、NA.4. Table NA.5 Imposed floor loads due to storage Category of loaded area Specific useSub-categoryExamples E1Areas susceptible to accumulation of goods, including access areas E11General areas for static equipment not specified elsewhere (institutional and public buildings) E12Reading rooms with book storage, e.g. libraries E13General storage other than those specified (see Note) E14File rooms, filing and storage space (offices) E15Stack rooms (books) E16Paper storage for printing plants a