tailieunhanh - Part 3: Code of practice for imposed roof loads

This Part of BS 6399 gives minimum imposed roof loads for use in designing buildings and building components which are to be constructed and used in the UK and the Channel Islands. It applies to: a) new buildings and new structures; b) alterations and additions to existing buildings and existing structures. Caution is necessary in applying the snow load calculations for sites at altitudes above 500 m and specialist advice should be obtained in such situations (see appendix C). | BRITISH STANDARD Loading for buildings Part 3 Code of practice for imposed roof loads ICS NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS 6399-3 1988 Incorporating Amendments Nos. 1 and 3 and Implementing Amendment No. 2 BS 6399-3 1988 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Sector Board for Building and Civil Engineering B - to Technical Committee B 525 1 upon which the following bodies were represented British Constructional Steelwork Association Ltd. British Iron and Steel Producers Association British Masonry Society Concrete Society Department of the Environment Building Research Establishment Department of the Environment Property and Building Directorate Highways Agency Institution of Civil Engineers Institution of Structural Engineers National House Building Council Royal Institute of British Architects Steel Construction Institute This 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 Amendments issued since publication into effect on 31 May 1988 Amd. No. Date of issue Comments BSI 11-1998 6033 August 1988 The following BSI references relate to the work on this standard 9187 September 1996 Committee reference CSB 54 Draft for comment 86 13528 DC 9452 May 1997 Indicated by a sideline in the margin ISBN 0 580 16577 9 BS 6399-3 1988 Contents Committees responsible Foreword Page Inside front cover ii Section 1. General 1 Scope 1 2 Definitions 1 3 Symbols 1 4 Minimum impose roof loads 2 Section 2. Snow loads 5 Snow load on the roof 4 6 Snow load on the ground 4 7 Snow load shape coefficients 6 8 Snow sliding down roofs 9 Appendix A Annual probabilities of exceedance different from 21 Appendix B Snow drift load calculations 21 Appendix C Addresses of advisory offices 21 Figure 1 Basic snow load on the .