BS 6399-3 PDF

Date of issue August September May Indicated by a sideline in the margin Comments BS The subsequent calculations make use of some or all of the following documents: BS BS BS BS BS Find the most up-to-date version of BS at Engineering

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The minimum imposed roof load specified does not include an allowance for loads due to services. Worldwide Standards We can source any standard from anywhere in the world. Imposed roof loads were previously included in BS Code of practice for imposed roof loads ICS The correction is based on limited information which shows that the snow density is increased when the snow forms in drifts.

The factor is appropriate for the design of most structures. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. Information on standards BSI provides a wide range of information on national, European and bx standards through its Library and its Technical Help to Exporters Service.

For this type of roof it is necessary transport of snow from one side of the curved roof to to consider two load cases. The appropriate drift length and snow load shape NOTE In determining the upper bound values for these drift coefficient for an abrupt change of height should be loads account has been taken of known cases of excessive, drifting obtained b Figure 6 or from the following in of snow in the UK.

BS _Loading for building-Part3 Imposed roof loads_图文_百度文库

66399-3 members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. The exception to this is the treatment of the load cases involving local drifting of snow, where it is recommended that these are treated as exceptional loads and used in design with reduced safety factors.


This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations.

Copyright Copyright subsists in all BSI publications. Both types of redistribution should be considered if appropriate.

For roofs of more than two spans with approximately symmetrical and uniform geometry, b3 should be taken as the horizontal dimension of three roof slopes i. BSLoading for buildings. The effects of deflection under concentrated loads need only be considered when such deflection would adversely affect the finishes. For sites whose altitude is above m bd advice should be sought see clause 1 and appendix C. For the purpose of this subclause the roof area is defined as the total covered area, in plan, of the entire building structure.

The factor is usually 5 or 8 depending upon the severity of drifting likely to occur for the design configuration being considered.

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b General 1 Scope 2. BS ,Code of practice for dead and imposed loads. NOTE The effect of structures close to, but not abutting the roof under consideration will depend partly on the roof areas available from which snow can be blown into the drift and the difference in levels.

However, as an approximate rule, it is only necessary to consider nearby structures when they are less than 1. This code can be used for design using permissible stresses or partial factors.


BRE DigestLoads on roofs from snow drifting against vertical obstructions and in valleys2. Overview Product Details Loading for buildings – Part 3: Appendix B explains the the simultaneous drifts should not exceed the logical process behind the calculations.

Again there may be more recent versions of the document.

Wherever possible, available observational data have been incorporated in the development of the design models. This Code bss the actual drift shapes and load intensities by simplified linear distributions, based on assumptions on the amount of snow available to drift and limitations on the drift height.

The drifts which occur at local projections and obstructions affect a relatively small area of roof only. Abstract This part of BS specifies 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.

Drift length ls1 is the least value bx 5h01, b1 and 15 m.

BS 6399-3:1988

The type and record length of the ground snow data available and the paucity of observational data on roof snow loads make it extremely difficult to estimate snow load distributions reliably. Where site snow loads with a probability of exceedance different from 0. It is incorporated by Royal Charter. This subclause is an optional alternative to 4.