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1、a Date: 22 August 2007 Origin: National Latest date for receipt of comments: 30 September 2007 Project no.: 2006/02706 Responsible committee: B/525/5 Structural use of timber Interested committees: Title: Draft BS 5268-2:2002/Amd 1 Structural use of timber Part 2: Code of practice for permissible st
2、ress design, materials and workmanship Supersession information: If this document is published as a standard, the UK implementation of it will supersede BS5268-2 : 2002 and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (c
3、ontact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 30 September 2007. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgemen
4、t will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electroni
5、c circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email ordersbsi-. British, International and foreign standards are also available from BSI Custo
6、mer Services. British Standards on CD or Online are available from British Standards Publishing Sales Limited. Tel: 01344 404409 or email bsonlinetechindex.co.uk. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committ
7、ee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsi-. Direct tel: 020 8996 7156 Responsible Committee Secretary: Ms C Price (BSI)
8、E-mail: clare.pricebsi- Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 7.0 DPC: 07/30156974 DC Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:51:42 GMT+00:00 200
9、7, Uncontrolled Copy, (c) BSI b Introduction Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments are received to the contrary, this draft may be implemented unchanged as a British Standard. Submission The guidance given below
10、is intended to ensure that all comments receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on th
11、e front cover. Comments should be compatible with Version 6.0 or Version 97 of Microsoft Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. All comments submitted should be
12、 presented as given in the example below. Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/www.bsi- Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex
13、(e.g. 3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains conn
14、ector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Micros
15、oft Corporation. Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:51:42 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft BS 5268-2:2002/Amd 1 August 2007 Draft BS 5268-2:2002/Amd 1 (only new or amended clauses/tables/figures/annexes are shown) 1 Licensed Copy:
16、 London South Bank University, London South Bank University, Fri Oct 05 02:51:42 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft BS 5268-2:2002/Amd 1 August 2007 Contents Changes in Section 1: General 3 Changes in Section 2: Timber 9 Changes in Section 3: Glued laminated timber 13 Changes in Sectio
17、n 4: Plywood 15 Changes in Section 5: Panel products other than plywood 16 Changes in Section 6: Joints 17 Changes in Section 7: Workmanship, inspection and maintenance 24 Changes in Section 8: Testing 25 Changes to Annexes 26 Changes to Bibliography 32 2 Licensed Copy: London South Bank University,
18、 London South Bank University, Fri Oct 05 02:51:42 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft BS 5268-2:2002/Amd 1 August 2007 Section 1: General Page 1, Clause 1.2, Normative references Clause to be changed to the following: The following referenced documents are indispensable for the applica
19、tion of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Standards publications BS 449-2, Specification for the use of structural steel in building Part 2: Metric units BS 12
20、02-1, Specification for nails Part 1: Steel nails BS 1210, Specification for wood screws BS 4320, Specification for metal washers for general engineering purposes Metric series BS 4978, Visual strength grading of softwood Specification BS 5268-5, Structural use of timber Part 5: Code of practice for
21、 the preservative treatment of structural timber BS 5756:2007, Visual grading of hardwood Specification BS 6100-8, Building and civil engineering Vocabulary Part 8: Work with timber and wood-based panels BS 6150, Painting of buildings Code of practice BS 6399-1:1996, Loading for buildings Part 1: Co
22、de of practice for dead and imposed loads BS 6399-2, Loading for buildings Part 2: Code of practice for wind loads BS 6399-3, Loading for buildings Part 3: Code of practice for imposed roof loads BS 6446, Specification for manufacture of glued structural components of timber and wood based panels BS
23、 7916, Code of practice for the selection and application of particleboard, oriented strand board (OSB), cement bonded particleboard and wood fibreboards for specific purposes BS EN 300, Oriented strand boards (OSB) Definitions, classification and specifications BS EN 301, Adhesives, phenolic and am
24、inoplastic, for load-bearing timber structures Classification and performance requirements BS EN 310, Wood-based products Determination of modulus of elasticity in bending and of bending strength BS EN 312, Particleboards Specifications BS EN 314-1, Plywood Bonding quality Part 1: Test methods BS EN
25、 314-2, Plywood Bonding quality Part 2: Requirements BS EN 315, Plywood Tolerances for dimensions BS EN 322, Wood-based panels Determination of moisture content BS EN 323, Wood-based panels Determination of density 3 Licensed Copy: London South Bank University, London South Bank University, Fri Oct
26、05 02:51:42 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft BS 5268-2:2002/Amd 1 August 2007 BS EN 324-1, Wood-based panels Determination of dimensions of boards Part 1: Determination of thickness, width and length BS EN 324-2, Wood-based panels Determination of dimensions of boards Part 2: Determi
27、nation of squareness and edge straightness BS EN 336, Structural timber Sizes, permitted deviations BS EN 338, Structural timber Strength classes BS EN 385, Finger jointed structural timber Performance requirements and minimum production requirements BS EN 622-2, Fibreboards Specifications Part 2: R
28、equirements for hardboards BS EN 622-3, Fibreboards Specifications Part 3: Requirements for medium boards BS EN 622-5, Fibreboards Specifications Part 5: Requirements for dry process boards (MDF) BS EN 636, Plywood Specifications BS EN 789, Timber structures Test methods Determination of mechanical
29、properties of wood based panels BS EN 912, Timber fasteners Specifications for connections for timber BS EN 1058, Wood-based panels Determination of characteristic values of mechanical properties and density BS EN 1195, Timber structures Test methods Performance of structural floor decking BS EN 123
30、69-1, Wood-based panels Characteristic values for structural design Part 1: OSB, particleboards and fibreboards BS EN 12369-2, Wood-based panels Characteristic values for structural design Part 2: Plywood BS EN 12871, Wood-based panels Performance specifications and requirements for load bearing boa
31、rds for use in floors, walls and roofs BS EN 14080, Timber structures Glued laminated timber Requirements BS EN 14081 (all parts), Timber structures Strength graded structural timber with rectangular cross section DD ENV 12872, Wood-based panels Guidance for structural panel installation BS EN ISO 8
32、98-1:1999, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs Other references Will be checked prior to publication. Page 4, Clause 1.3 For the purposes of BS 5268-2 the terms and definitions given in BS 6100-8 and the following apply. 4 Licensed
33、Copy: London South Bank University, London South Bank University, Fri Oct 05 02:51:42 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft BS 5268-2:2002/Amd 1 August 2007 Page 4, Clause 1.3.1 This definition can be deleted. Page 4, Clause 1.3.6 Add the following note: NOTE For the purposes of BS 5268-2
34、, grade stresses for structural timber are derived from the characteristic stresses given in BS EN 338. Page 7, Clause 1.5, 2nd paragraph Amend the list of standards as follows: a) Delete BS 1203, BS 1204, BS 4978. b) Replace BS 1579 by BS EN 912. c) Replace BS 5669 by BS EN 312, BS EN 300. d) Repla
35、ce BS EN 518, BS EN 519 by BS EN 14081. e) Insert BS EN 14080. Page 7, Clause 1.5 Delete points g) and h) at bottom of clause. Page 8, Clause 1.6.1.1 In note replace “fibreboard, wood particleboard” by “other panel products”. Page 8, replace clause 1.6.2 with the following. 1.6.2 Loading For the pur
36、pose of design, loading should be in accordance with BS 6399-1, BS 6399-2 and BS 6399-3 or other relevant standards, where applicable. The effects of exceptional snow drift loads on roofs, as defined in BS 6399-3 should be checked using the permissible member stresses given in 1.6.3.8 and the permis
37、sible fastener loads given in 1.6.3.9. Pages 8 or 2) Option 2. The provision of effective horizontal ties in accordance with 1.6.3.3. c) Class 2B buildings either: 1) Option 1. Effective horizontal ties in accordance with 1.6.3.3 and vertical ties in accordance with 1.6.3.4; or 2) Option 2. Check fo
38、r the notional removal of load-bearing elements in accordance with 1.6.3.5. d) Class 3 buildings: The designer should carry out a risk assessment as required by the National Building Regulations or Standards. 1.6.3.2 Effective anchorage of suspended floors A suspended floor can be considered to be e
39、ffectively anchored if the connection between the floor and load-bearing wall complies with either: Figure M.3; or BS 5628-1:2005, Annex D for timber floors supported by load-bearing masonry. 1.6.3.3 Effective horizontal ties All buildings should be effectively tied together at each principal floor
40、level and at roof level. Horizontal ties should be provided as follows (see also Figure M.1): Peripheral ties with a design capacity of 0.5Ft should be provided around the whole perimeter of the building. Ties should be anchored at external and re-entrant corners. Internal ties should be provided in
41、 two directions approximately at right angles. They should be effectively continuous throughout their length and should be anchored at the periphery of the building. They may be distributed evenly throughout the floor or may be concentrated at column positions. Internal ties should be designed for a
42、 load of Ft. External columns and load-bearing walls should be tied in by a tie perpendicular to the edge of the building. The tie should be designed for the greater of Ft or 1% of the maximum design vertical dead and imposed load in the column at that level. Corner columns should be tied in two dir
43、ections approximately at right angles. The basic tie force Ft should be calculated as follows: For distributed ties: Ft = 0.5(gk + qk)L kN/m but not less than 3.5 kN/m. For concentrated ties: Ft = 0.5(gk + qk)stL kN but not less than 10 kN. where gk is the full dead load per unit area of the floor o
44、r roof (kN/m2). qk is the full imposed floor or roof load per unit area (kN/m2). st is the mean spacing of ties transverse to the direction of the tie being considered (m). L is the length of tie being considered (m). 6 Licensed Copy: London South Bank University, London South Bank University, Fri O
45、ct 05 02:51:42 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft BS 5268-2:2002/Amd 1 August 2007 When assessing the capacity of an element acting as a tie, in accordance with 1.6.3.8 or its connections in accordance with 1.6.3.9, the tie load can be considered as an alternative load case to any othe
46、r loads acting on that element. 1.6.3.4 Vertical ties Each column or wall carrying vertical load should be tied continuously from the lowest to the highest level. The tie should be capable of resisting a tensile force equal to the maximum design load received by the column or wall from any one store
47、y. There should be an effective connection between vertical ties and horizontal ties at each level. When assessing the capacity of an element acting as a vertical tie, in accordance with 1.6.3.8 or its connections in accordance with 1.6.3.9, the tie load can be considered as an alternative load case
48、 to any other loads acting on that element. 1.6.3.5 Notional removal of load-bearing element The structure should be checked for the effect of the removal, within each storey, of each supporting column, or beam supporting column(s) or load-bearing wall(s), or any nominal length of load-bearing wall,
49、 one at a time, to ensure that disproportionate collapse does not occur. The portion of the building at risk of collapse should not exceed the lesser of 15% of the floor area of that storey or 70 m2. If the area at risk exceeds the limits given then the column, beam or load-bearing wall should be designed as a key element in accordance with 1.6.3.6. The nominal lengt