BS-8100-1-1986.pdf
《BS-8100-1-1986.pdf》由会员分享,可在线阅读,更多相关《BS-8100-1-1986.pdf(78页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 8100-1:1986 Incorporating Amendment No. 1 Lattice towers and masts Part 1: Code of practice for loading UDC 624.97.074.5 ? Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:02:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8100-1:1986 This
2、 British Standard, having been prepared under the direction of the Civil Engineering and Building Structures Standards Committee, was published under the authority of the Board of BSI and comes into effect on 28 November 1986 BSI 11 May 2005 The following BSI references relate to the work on this st
3、andard: Committee reference CSB/40 Draft for comment 78/13078 DC ISBN 0 580 14603 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Civil Engineering and Building Standards Structures Committee (CSB/-) to Technical Committee CSB/40, upon
4、 which the following bodies were represented: British Broadcasting Corporation British Steel Industry British Telecommunications plc Constructional Steel Research and Development Organisation Department of Energy (Electricity Division) Department of the Environment (Building Research Establishment)
5、Electricity Supply Industry in England and Wales Home Office Independent Broadcasting Authority Institution of Civil Engineers Institution of Structural Engineers Joint Radio Committee of the Nationalized Power Industries Ministry of Defence National Maritime Institute North of Scotland Hydro-electr
6、ic Board Transmission and Distribution Association (BEAMA Ltd.) Amendments issued since publication Amd. No.Date of issueComments 1519711 May 2005See Foreword Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:02:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
7、8100-1:1986 BSI 11 May 2005 i Contents Page Committees responsibleInside front cover Forewordiv Section 1. General 1.1Scope1 1.2Definitions1 1.3Symbols2 1.3.1 Main symbols2 1.3.2 Subscripts2 Section 2. Performance requirements 2.1Safety and service life3 2.1.1 General3 2.1.2 Service life3 2.2Classif
8、ication of required reliability3 2.2.1 General3 2.2.2 Environmental conditions3 2.2.3 Economic consequences of usage3 2.3Classification of quality5 2.3.1 General5 2.3.2 Class A towers5 2.3.3 Class B towers5 2.3.4 Class C towers5 2.4Safety factors5 2.4.1 Wind speed and ice thickness factors5 2.4.2 De
9、ad load and partial factors6 2.5Safety assessment6 2.6Serviceability6 Section 3. Meteorological parameters 3.1Wind speed data7 3.1.1 General7 3.1.2 Basic wind speed7 3.1.3 Wind direction factor7 3.1.4 Terrain roughness factor9 3.1.5 Site reference wind speed9 3.2Variation of wind speed with height10
10、 3.2.1 Sites on level terrain10 3.2.2 Sites on hills11 3.3Serviceability13 3.3.1 Distribution of wind speeds13 3.3.2 Downwind deflections14 3.3.3 Crosswind deflections (vortex shedding)15 3.4Fatigue life assessment18 3.4.1 In-line vibrations18 3.4.2 Crosswind vibrations18 3.5Ice loading18 3.5.1 Gene
11、ral18 3.5.2 Basic ice thickness19 3.5.3 Reference ice thickness19 3.5.4 Ice weight20 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:02:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8100-1:1986 ii BSI 11 May 2005 Page Section 4. Wind resistance 4.1General2
12、3 4.1.1 Method of derivation23 4.1.2 Symmetrical towers without ancillaries23 4.1.3 Symmetrical towers with limited ancillaries23 4.1.4 Other cases23 4.2Method for symmetrical towers without ancillaries24 4.2.1 Calculation of total wind resistance24 4.2.2 Overall drag coefficients26 4.3Method for sy
13、mmetrical towers with limited ancillaries26 4.3.1 Constraints for simplified method26 4.3.2 Calculation of total wind resistance29 4.4General method for towers containing ancillaries or unsymmetrical towers29 4.4.1 Calculation of total wind resistance29 4.4.2 Drag (pressure) coefficients for single
14、frames31 4.5Linear ancillaries32 4.6Discrete ancillaries34 4.7Cables35 4.8Icing35 Section 5. Structural response to wind 5.1Procedure37 5.1.1 General37 5.1.2 Equivalent static method37 5.1.3 Spectral analytical method37 5.1.4 Deflections37 5.1.5 Vortex-excited vibrations37 5.2Wind loading for symmet
15、rical towers38 5.2.1 General38 5.2.2 Basic gust response factor38 5.2.3 Loading for calculating bending moments39 5.2.4 Loading for calculating shear forces40 5.2.5 Loading for calculating deflections42 5.2.6 Calculation of wind forces in tower members42 5.3Wind loading for towers with complex attac
16、hments43 5.3.1 General43 5.3.2 Loading on ancillary items43 5.3.3 Loading on cables44 5.3.4 Calculation of wind forces in tower members47 5.3.5 Loading for calculating deflections48 5.4Spectral analytical method48 5.5Crosswind response due to vortex excitation48 5.5.1 Critical wind speed48 5.5.2 Exc
17、itation49 Appendix A Measurement and interpretation of wind data51 Appendix B Terrain parameters53 Appendix C Gradient wind speeds54 Appendix D Hill parameters in undulating terrain58 Appendix E Parameters for spectral analytical methods59 Appendix F Method of assessment for classification of qualit
18、y62 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:02:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8100-1:1986 BSI 11 May 2005 iii Page Appendix G Equations used for the production of the curves in the figures63 Figure 2.1 Partial safety factors on wind
19、speed, ice thickness, dead load and design strength4 Figure 3.1 Basic mean hourly wind speeds for UK, (metres per second)8 Figure 3.2 Wind direction factor, Kd9 Figure 3.3 Variation of power law index and effective height with terrain roughness11 Figure 3.4 Terrain profile index, , for hills12 Figur
20、e 3.5 Terrain profile factor, K4, for hills13 Figure 3.6 Hours per year that the mean hourly wind speed exceeds the serviceability limit15 Figure 3.7 Wind speed duration factor16 Figure 3.8 Expected average annual occurrence of mean wind speeds as a function of direction17 Figure 3.9 Ice thickness f
21、or UK, ro and rw (in millimetres)21 Figure 4.1 Projected panel area used to calculate solidity ratio, 25 Figure 4.2 Wind incidence factor, K27 Figure 4.3 Overall normal drag coefficients, CN, for square and triangular towers28 Figure 4.4 Shielding factor, f, for single frames composed of flat-sided
22、members31 Figure 4.5 Normal drag coefficients, Cn, for single frames34 Figure 5.1 Size factor, B39 Figure 5.2 Height factor, j40 Figure 5.3 Basic gust response factor, GB41 Figure 5.4 Shear loading factor, Kq42 Figure 5.5 Length factors, KL, for cables45 Figure 5.6 Projected lengths of cables46 Figu
23、re 5.7 Cable height factor, Kz47 Figure 5.8 Effective excitation coefficients, ke50 Figure A.1 Derivation of terrain roughness factor, KR, from wind speed records52 Figure C.1 Mean hourly gradient wind speed, for the UK (in metres per seconds)56 Figure C.2 Gradient wind speed reduction factor, Kg57
24、Figure D.1 Hill parameters in undulating terrain58 Table 3.1 Terrain characteristics10 Table 4.1 Typical drag (pressure) coefficients for individual components33 Table 4.2 Reduction factor, KA, for additional ancillary items33 Table E.1 Logarithmic decrements of damping, T, for tower superstructure6
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS 8100 1986
链接地址:https://www.31doc.com/p-3736557.html