BS-8100-4-1995.pdf
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1、BRITISH STANDARD BS 8100-4: 1995 Incorporating Amendment No. 1 and Corrigendum No. 1 Lattice towers and masts Part 4: Code of practice for loading of guyed masts UDC 624.97.074.5 ? Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:03:00 GMT+00:00 2006, Uncontro
2、lled Copy, (c) BSI BS 8100-4:1995 This British Standard, having been prepared under the direction of the Technical Committee B/525, Building and civil engineering structures, was published under the authority of the Standards Board and comes into effect on 15 February 1995 BSI 17 November 2005 The f
3、ollowing BSI references relate to the work on this standard: Committee reference B/525/32 Draft for comment 92/15665 DC ISBN 0 580 22706 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee B/525, Building and civil engineer
4、ing structures, to Subcommittee B/525/32 upon which the following bodies were represented: Association of Consulting Engineers British Cement Association British Constructional Steelwork Association Ltd. British Masonry Society Building Employers Confederation Department of the Environment (Building
5、 Research Establishment) Department of the Environment (Construction Directorate) Department of Transport Federation of Civil Engineering Contractors Institution of Civil Engineers National Council of Building Material Producers Royal Institute of British Architects Timber Research and Development A
6、ssociation The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Broadcasting Corporation British Telecommunications plc Department of Trade and Industry (Electricity Division) Meteorological Office Steel Construction Institute Amendmen
7、ts issued since publication Amd. No. DateComments 137878 April 2003See foreword 1597917 November 2005Correcting errors in Annex K and Annex M. See also foreword Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:03:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI B
8、S 8100-4:1995 BSI 17 November 2005 i Contents Page Committees responsibleInside front cover Forewordiv Section 1. General 1.1Scope1 1.2References1 1.3Definitions1 1.4Symbols2 Section 2. Performance 2.1Safety and service life5 2.2Classification of required reliability5 2.3Classifications of quality6
9、2.4Safety factors7 2.5Safety assessment9 2.6Serviceability9 2.7Information to be provided by specifiers9 Section 3. Meteorological parameters 3.1Wind speed data11 3.2Effective wind speed15 3.3Serviceability16 3.4Fatigue life assessment19 3.5Ice loading19 Section 4. Wind resistance 4.1General23 4.2Wi
10、nd resistance of mast structure23 4.3Linear ancillaries24 4.4Discrete ancillaries25 4.5Guys25 4.6Icing25 Section 5. Structural response to wind 5.1Procedure31 5.2Static gust response procedure for masts up to 150 m high32 5.3Static gust response procedure: general35 5.4Wind loading for unsymmetrical
11、 masts or masts with complex attachments37 5.5Spectral analytical method37 5.6Crosswind response due to vortex excitation37 Annex A (informative) Method of assessment for classification of quality50 Annex B (normative) Deflections and fatigue51 Annex C (informative) Derivation of extreme wind inform
12、ation: and Sd55 Annex D (informative) Gradient wind speeds56 Annex E (informative) Seasonal factor Ss58 Annex F (informative) Terrain categories59 Annex G (informative) Effective height60 Annex H (normative) Topography factors61 Vb Licensed Copy: London South Bank University, London South Bank Unive
13、rsity, Fri Dec 08 06:03:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8100-4:1995 ii BSI 17 November 2005 Page Annex J (informative) Hill parameters in undulating terrain66 Annex K (normative) General method for determination of wind resistance68 Annex L (normative) Equations used for the product
14、ion of the curves in the figures72 Annex M (normative) Parameters for spectral analytical methods74 Annex N (informative) Parameters 277 Annex P (normative) Loading for unsymmetric masts or masts with complex attachments78 Figure 1 Partial safety factors on wind speed, ice thickness, dead load and d
15、esign strength8 Figure 2 Basic hourly mean wind speeds for the United Kingdom14 Figure 3 Fetch factor Sc17 Figure 4 Fetch adjustment factor Tc18 Figure 5 Ice thickness ro and rw for the United Kingdom22 Figure 6 Projected panel area used to calculate the solidity ratio 26 Figure 7 Wind incidence fac
16、tor Figure 8 Overall normal drag (pressure) coefficients CN for square and triangular structures28 Figure 9 Derivation of fluctuating bending moment diagrams39 Figure 10 Basic gust response factor40 Figure 11 Length factor KL for guys or cables41 Figure 12 Projected length of guy42 Figure 13 Guy or
17、cable height factor Kz43 Figure 14 Application of patch loads45 Figure 15 Turbulence intensity i045 Figure 16 Turbulence factor Kc46 Figure 17 Factor KT 47 Figure 18 Application of patch loading 48 Figure 19 Excitation coefficient ke 49 Figure B.1 Hours per year in which the hourly mean wind speed e
18、xceeds the serviceability limit52 Figure B.2 Wind speed duration factor53 Figure B.3 Expected average annual occurrence of mean wind speeds as a function of direction54 Figure D.1 Hourly mean gradient wind speed for the United Kingdom57 Figure D.2 Gradient wind speed reduction factor Kg58 Figure F.1
19、 Typical town site60 Figure G.1 Effective heights in towns61 Figure H.1 Definition of topographic dimensions 63 Figure H.2 Typographic location factor s for hills and ridges 64 Figure H.3 Typographic location factor s for cliffs and escarpments 65 Figure J.1 Hill parameters in undulating terrain66 F
20、igure K.1 Shielding factor f for single frames composed of flat-sided members 70 Figure K.2 Normal drag (pressure) coefficient CN for single frames71 Vb K Vg Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:03:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8
21、100-4:1995 BSI 17 November 2005 iii Page Table 1 Values of Sd for the United Kingdom12 Table 2 Typical normal drag (pressure) coefficients for individual components29 Table 3 Reduction factor KA for additional ancillary items29 Table 4 Derivation of total load effects for the procedure given in 5.24
22、4 Table A.1 Assessment of quality rating50 Table A.2 Determination of quality classification50 Table E.1 Values of Ss for sub-annual periods58 Table H.1 Values of Le and Sh62 Table M.1 Logarithmic decrements of damping M for superstructure76 List of references79 Licensed Copy: London South Bank Univ
23、ersity, London South Bank University, Fri Dec 08 06:03:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8100-4:1995 iv BSI 17 November 2005 Foreword This Part of BS 8100 has been prepared under the direction of Technical Committee B/525, Building and civil engineering structures. BS 8100 is a standa
24、rd combining codes of practice with a guide covering the loading and design of lattice towers and masts of metallic construction. It comprises the following Parts: Part 1: Code of practice for loading; Part 2: Guide to the background and use of Part 1 “Code of practice for loading”; Part 3: Code of
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