BS 6399-3 PDF

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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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NOTE The effect of structures close to, but not abutting the roof under consideration will depend partly on the roof areas For roofs of more than two spans with available from which snow can be blown into the drift and the approximately symmetrical and uniform geometry, difference in levels. Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards.

Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. For asymmetric pitched roofs, each windward side. This force should be taken into account in the design of snowguards or snowfences if snow is likely to slide off the roof endangering people or property below.

CP 3, Code of basic data for the design of buildings1. The equations given in Figure 2 to Figure 9 for determining the snow load shape coefficients are empirical; where they are associated with local drifting of snow they include a correction to allow for an increased weight density in the drift. Gibb Limited, Gibb Ltd, March 19,Uncontrolled Copy, c BSI Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 22, an inside back cover and a back cover.

The snow loads should be determined according to clause 7. The force Fs in kN per metre roofs the snow load shape coefficients and the drift width exerted by a sliding mass of snow in the lengths should be obtained from Figure 8. They are corrected for an assumed ground level datum of m above mean sea level and have an annual probability of exceedance of 0.

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

The full list of organizations that have taken part in the work of the Technical Committee is given on the Inside front cover. This subclause applies where there is an abrupt change of height greater than 1 m, except that relatively slender obstructions e.


Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services.

Customers who bought this product also bought BS EN It is included for designers who wish bx understand the parameters which influence the magnitude of the snow loads associated with drifting of snow. Therefore, it is curved roofs 6399-3 single span. Click to learn more. For sites whose altitude is above m specialist advice should be sought see clause 1 and appendix C. Amendment 2 has been issued to address problems encountered with use.

However, it is recommended that they are treated as exceptional snow loads because of the rarity with which they are expected to occur. The value for be considered. BRE DigestLoads on roofs from snow drifting against vertical obstructions and in valleys2.

These loads assume that spreader boards will be used while any cleaning or maintenance work is in progress on fragile roofs. It is the constant aim of BSI to improve the 6399- of our products and services. The value for the snow load shape coefficient for one slope of the roof should be zero, i. The minimum distinguish between several horizontal imposed roof load specified does not include an allowance for dimensions on the same diagram; loads due to services.

For this direction of slide is calculated from the following case the variation in the direction parallel to the equation: Wherever possible, available observational data have been incorporated in the development of the design models.

We would be grateful 63999-3 anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover.

The value for the snow load shape coefficient should be obtained from Figure 4 a. BS ,Code of practice for dead and imposed loads. For both cases the value of the snow load shape coefficient?


For type 2 This clause gives roof snow loads for be curved roofs the equivalent slope is the angle pitched, multi-span convex-curved and northlight between the horizontal and a line drawn from the roofs.

BS 6399-3:1988

NOTE The sopleths in Figure 1 are derived from analysis of data from a ns number of recording stations and therefore unusual local effects may not be included. The snow load on the roof should be considered to be a medium term load for the majority of design in the UK, i. Digest was drafted so that the drift loads could be treated as ultimate loads. This standard has been updated see copyright date and may have bx amendments incorporated.

For 639-3 roofs it is a that resulting from a uniformly distributed necessary to consider a single load case resulting layer of snow over the complete roof, likely to from a uniform layer of snow over the complete roof. Click here to find out how to access this document. This Code models 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.

Contact the Information Centre. Gibb Limited, Gibb Ltd, March 19,Uncontrolled Copy, c BSI This appendix briefly describes the general process adopted for determining the maximum local load intensity resulting from snow in a drift at a change in roof height.

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.

Imposed roof loads were previously included in BS In general, load cases should be considered to act individually and not together.

Code de bonne pratique Title in German Lasten fuer Gebaeuden. The appropriate value for sd is obtained from clause 63399-3. The appropriate local drift loads as given 7.