BS 8103-2-2013 Structural design of low-rise buildings Code of practice for masonry walls for housin《低层建筑的结构设计 房屋砌体墙的实用规程》.pdf

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1、BSI Standards PublicationBS 8103-2:2013Incorporating Corrigendum No. 1Structural design of low-risebuildings Part 2: Code of practice for masonrywalls for housingPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The Br

2、itish Standards Institution 2013Published by BSI Standards Limited 2013ISBN 978 0 580 84979 4ICS 91.040.30; 91.060.10The following BSI references relate to the work on this document:Committee reference B/525/6Draft for comment 13/30262014 DCPublication historyFirst published, January 1996Second edit

3、ion, March 2005Third (present) edition, September 2013Amendments issued since publicationDate Text affectedNovember 2013 See ForewordBS 8103-2:2013 BRITISH STANDARDContentsForeword iii1 Scope 12 Normative references 13 Terms and definitions 24 Field of application 35 Construction materials of walls

4、156 Conditions relating to walls 167 Horizontal lateral support by roof and floors 288 Masonry chimneys 299 Parapet walls 29AnnexesAnnex A (normative) External walls of small single storey non-residentialbuildings and annexes 31Annex B (normative) Design provisions for movement in masonry 36Bibliogr

5、aphy 39List of figuresFigure 1 Field of application 4Figure2Walls with a difference in ground level on opposite sides 6Figure 3 Basic wind speed, V, map (m/s) before the altitude correction isapplied 9Figure 4 Orographic zones for factor O 10Figure 5 Orography factor, O, for hills and ridges 11Figur

6、e 6 Orography factor, O, for cliffs and escarpments 11Figure 7 Maximum height of building 12Figure 8 Measuring storey and wall heights 13Figure 9 Maximum floor areas enclosed by structural walls 14Figure 10 Building size and shape 15Figure 11 Minimum wall thickness for external and separating walls

7、17Figure 12 Minimum wall thickness for external and separating walls withstorey heights A and D (see Figure 8) 18Figure 13 Compressive strength of masonry units for buildings 19Figure 14 Lintel spanning in the plane of the wall 21Figure 15 Plan of lintel spanning at right angles to the wall 21Figure

8、 16 Spacing of wall ties 23Figure 17 Internal buttressing walls 25Figure 18 Piers and chimneys providing restraint 26Figure 19 Size and position of opening and recesses 27Figure 20 Sizes of chases 28Figure 21 Sizes of chimneys 29Figure 22 Sizes of parapet walls: maximum height 860 mm 30Figure A.1 Si

9、ze and shape of buildings or annexes see also A.1g) and A.4 32Figure A.2 Location of openings 34Figure A.3 Wall thicknesses 35Figure A.4 Horizontal lateral restraint at roof level 36Figure B.1 Movement joint at change in external wall height 37Figure B.2 Offsets 37Figure B.3 Movement joints in terra

10、ced housing 38List of tablesTable 1 Altitude factor 7BRITISH STANDARD BS 8103-2:2013 The British Standards Institution 2013 iTable 2 Factor O 8Table 3 Maximum allowable building height 8Table 4 British Standards for construction materials 16Table 5 Compressive strengths of bricks and blocks used in

11、Figure 13 (inN/mm2) 20Table 6 Normalized compressive masonry unit strengths of clay and calciumsilicate blocks conforming to BS EN 771-1 and BS EN 771-2 20Table 7 Minimum bearing length for lintels 22Table 8 Selection of lengths of wall ties 24Table 9 Selection of strengths of wall ties 24Table 10 V

12、alue of X in Figure 19 28Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 40, an inside back cover and a back cover.BRITISH STANDARDBS 8103-2:2013ii The British Standards Institution 2013ForewordPublishing informationThis part of BS 8103 is publi

13、shed by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effect on 30 September 2013. Itwas prepared by Subcommittee B/525/6, Use of masonry, under the authority ofTechnical Committee B/525, Building and civil engineering structure. A list oforganizations rep

14、resented on this committee can be obtained on request to itssecretary.SupersessionThis part of BS 8103 supersedes BS 8103-2:2005, which is withdrawn.Relationship with other publicationsIn addition to BS 8103-2, BS 8103 comprises two further parts: Part 1: Structural design of low-rise buildings. Cod

15、e of practice for stability,site investigation, foundations, precast concrete floors and ground floorslabs for housing; Part 3: Code of practice for timber floors and roofs for housing.Information about this documentThis is a full revision of the standard, and introduces the following principalchang

16、es. The document has been updated to bring it in line with changes toBS 8103-1. The wind loading map has been updated and revised. The references have been updated to align with the Structural Eurocodes.A large proportion of the national building programme is concerned with newhouse construction or

17、development sites and alterations, specifically houseextensions and additional dwelling space. This covers both the public andprivate sectors where traditional methods of construction are used for themajority of houses, and it is to these that this part of BS 8103 is applicable.Low-rise buildings co

18、nstructed in accordance with this part of BS 8103 do notrequire additional specialist advice. Extensions to low-rise housing also requireno additional specialist advice if they, together with the original building, areconstructed in accordance with this part of BS 8103. For any buildings, includingt

19、hose with extensions, outside the limitations of this part of BS 8103, as given in4.2 and 4.4, appropriate specialist advice is needed. The recommendations madein this part of BS 8103 are based on traditional prescriptive guidancesubstantiated by long experience of use.In formulating the recommendat

20、ions in this part of BS 8103, maximum loadconditions and the most challenging limiting dimensions were used. In lesschallenging conditions it might be appropriate to consider a minor departurefrom the recommendations of this part of BS 8103 and show adequacy bycalculation.When using this part of BS

21、8103 it is important to assess that the overall stabilityof the building is achieved, and that the work of any specialist engaged isproperly coordinated. BS 8103-1 covers the stability aspect of low-rise housing;by following this guidance, users comply with the general robustnessrequirements of BS E

22、N 1991-1-7 and its UK National Annex.The recommendations in this part of BS 8103 are intended to provide economic,safe designs without the need for calculations for loading and strength criteria.BRITISH STANDARD BS 8103-2:2013 The British Standards Institution 2013 iiiThe figures in this part of BS

23、8103 support the text. They do not show allconstructional details and are not intended to illustrate compliance with anyother requirements or recommendations.Use of this documentAs a code of practice, this part of BS 8103 takes the form of guidance andrecommendations. It should not be quoted as if i

24、t were a specification andparticular care should be taken to ensure that claims of compliance are notmisleading.Any user claiming compliance with this part of BS 8103 is expected to be able tojustify any course of action that deviates from its recommendations.The start and finish of text introduced

25、or altered by Corrigendum No. 1 isindicated in the text by tagsand. Minor editorial changes are nottagged.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrecommendations are expressed in sentences in which the principal auxiliaryverb is “shoul

26、d”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.The word “should” is used to express recommendations of this standard. Theword “may” is used in the text to express permissibility, e.g. as an alternative tothe

27、 primary recommendation of the clause. The word “can” is used to expresspossibility, e.g. a consequence of an action or an event.Notes and commentaries are provided throughout the text of this standard.Notes give references and additional information that are important but do notform part of the rec

28、ommendations. Commentaries give background information.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobl

29、igations.Particular attention is drawn to the following: The Building Regulations 2010 Approved Document A (Structure). The Scottish Building Regulations 2004. Technical Handbooks. Section 1Structure. The Building Regulations of Northern Ireland 2012. Technical Booklet B.BRITISH STANDARDBS 8103-2:20

30、13iv The British Standards Institution 20131 ScopeThis part of BS 8103 gives recommendations on the structural design for wallsabove ground level damp-proof course (DPC) and walls between ground floorlevel and top of foundation level in the following range of buildings oftraditional construction:a)

31、low-rise housing comprising detached, semi-detached and terraced housesand flats (with not more than four self-contained dwelling units per flooraccessible from one staircase) of not more than three storeys above ground,intended for domestic occupation and within the limitations (as given in 4.2and

32、4.4) of this part of BS 8103;b) small single storey non-residential buildings, e.g. domestic garages andannexes to residential buildings not exceeding 36 m2in floor area(see Annex A);NOTE For such buildings all clauses of this part of BS 8103 are applicableexcept for 4.4, 4.5a), 6.1, 6.7.3 and 6.8.c

33、) extensions to low-rise housing conforming to 1a) providing that theextended building conforms to 4.4 and 4.5 of this part of BS 8103. Iftraditional masonry wall bonding (e.g. block bonding) is not used the designjunction between the original building and the extension is outside thescope of this p

34、art of BS 8103-2, as is the design of any part of the originalstructure that is adversely affected by additional loads, including loading tofoundations. The formation of new wall openings in the original building isoutside the scope of this British Standard.This British Standard is written for those

35、 with expertise in building constructionbut not necessarily in structural engineering design.For the purposes of this part of BS 8103, additional habitable accommodation inthe roof space constitutes a storey of the house. This part of BS 8103 does notapply to the design of basements, but, providing

36、the basement is of one levelonly and is designed to provide a firm platform at ground level, the provisionsof this part of BS 8103 may apply to the superstructure above the basement.This part of BS 8103 does not apply to thermal and sound insulation, resistanceto damp penetration and durability.Prop

37、rietary housing systems and houses of timber, steel or concrete framedconstructions are not covered by this part of BS 8103.Text deleted.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated

38、 references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS 4729, Clay and calcium silicate bricks of special shapes and sizes RecommendationsBS 6100 (all parts), Building and civil engineering VocabularyBS 81

39、03-1, Structural design of low-rise buildings Part 1: Code of practice forstability, site investigation, foundations, precast concrete floors and ground floorslabs for housingBS 8103-3, Structural design of low-rise buildings Part 3: Code of practice fortimber floors and roofs for housingBS EN 771 (

40、all parts), Specification for masonry unitsBRITISH STANDARD BS 8103-2:2013 The British Standards Institution 2013 1BS EN 772-1, Methods of test for masonry units Part 1: Determination ofcompressive strengthBS EN 845-1, Specification for ancillary components for masonry Part 1: Wallties, tension stra

41、ps, hangers and bracketsBS EN 845-3 Specification for ancillary components for masonry Part 3: Bedjoint reinforcement of steel meshworkBS EN 998-2, Specification for mortar for masonry Part 2: Masonry mortarBS EN 1991-1-1, Eurocode 1: Actions on structures Part 1-1: General actions Densities, self-w

42、eight, imposed loads for buildingsBS EN 1996-1-1, Eurocode 6: Design of masonry structures Part 1-1: Generalrules for reinforced and unreinforced masonry structuresBS EN 1996-2, Eurocode 6: Design of masonry structures Part 2: Designconsiderations, selection of materials and execution of masonryBS E

43、N 1996-3, Eurocode 6 Design of masonry structures Part 3: Simplifiedcalculation methods for unreinforced masonry structuresNA to BS EN 1996-1-1, UK National Annex to Eurocode 6: Design of masonrystructures Part 1-1: General rules for reinforced and unreinforced masonrystructuresPD 6678, Guide to the

44、 specification of masonry mortarPD 6697:2010, Recommendations for the design of masonry structures toBS EN 1996 1-1 and BS EN 1996-23 Terms and definitionsFor the purposes of this British Standard, the terms and definitions inBS 6100 (all parts) apply, together with the following.3.1 annexesingle st

45、orey adjunct to a residential buildingNOTE An annexe can be a porch, veranda, loggia, conservatory, greenhouse,garage, tool shed, fuel store, water closet, lavatory, wash-house, etc.3.2 traditional constructionbuilding constructed as follows:a) roofs:1) timber rafter and purlin;2) timber truss and p

46、urlin;3) timber trussed rafter;4) timber flat roof.b) ground floors:1) timber suspended;2) concrete ground-supported;3) concrete precast suspended;4) concrete in-situ reinforced suspended.c) intermediate floors:1) timber suspended;2) concrete precast suspended.BRITISH STANDARDBS 8103-2:20132 The Bri

47、tish Standards Institution 2013d) walls of masonry construction.3.3 thickness (of walls)space allocated to masonry units taking into account their allowed dimensionaldeviationsNOTE In the case of non-loadbearing walls this includes the thickness of any finishapplied to the wall.3.4 Category I masonr

48、y unitunit with a declared compressive strength with a given confidence levelNOTE Category I is defined in BS EN 771 (all parts), which also gives the confidencelevel.SOURCE: BS EN 771 (all parts)3.5 Category II masonry unitunit not intended to conform to the level of confidence of Category I unitsN

49、OTE Category II is defined in BS EN 771 (all parts).SOURCE: BS EN 771 (all parts)4 Field of application4.1 GeneralThe field of application of this part of BS 8103 should be determined inaccordance with Figure 1.BRITISH STANDARD BS 8103-2:2013 The British Standards Institution 2013 3Figure 1 Field of application4.2 Limiting loads and dimensions4.2.1 Vertical dead loadsAll floors and roofs supported by walls conforming to 3.2 should conform toBS 810