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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Enter the email address you signed up with and we’ll email you a reset link. To determine the uniform and asymmetric snow load cases, these structures may be divided into the single-span basic elements considered in 7.

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. Appendix B explains the the simultaneous drifts should not exceed the logical process behind the calculations. This check ba the general form of Meteorological Office, limiting the snow load shape coefficient to: BS ,Code of practice for dead and imposed loads.

This British Standard applies to: Condition b can be caused by a redistribution of 7. As the basic snow load on the ground is given for an assumed ground level altitude of m, it is necessary to adjust the value for locations where the ground level is above m. Where the roof is to have access for specific usages the imposed loads for c and d 639-3 should be replaced by the appropriate imposed floor load as recommended in 5.

The Amber document status indicator indicates that some caution is needed when using this document – it is either: Snow load shape coefficient m1 is the lesser of: The value for the snow 6399–3 shape coefficient for one side of the roof should be zero, i.

NOTE However, where, for example, on a lower roof area sheltered from all wind directions, there is the possibility of The value for the snow load shape coefficient for the redistribution of snow from a higher roof to form a local drift on other slope should be obtained from Figure 3 b ; this top of a uniform snow load distribution on this lower roof, it value is assumed to be constant over the loaded would be appropriate to consider the local drift load acting in combination with the uniform snow load on the lower roof.


It can also be caused by redistribution of snow which affects the load distribution on only a local part of the roof, e. For intersecting pitched roofs the snow load shape coefficients and the drift lengths should be obtained from Figure 8. This can result in more severe load imbalances ns than those resulting from clause 5 which have been derived for natural deposition patterns.

Standard Number BS Table 1 — Values of salt for 6 Snow load on the ground corresponding values of sb 6.

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. For bz redistributed snow load cases the distribution of the snow in the direction parallel to the obstruction is normally assumed to be uniform.

BS 6399-3:1988

These include local shelter from the wind, which may result in increased local snow loads, and local configurations in mountainous areas, which may funnel the bss and give increased local loading.

For sites whose altitude is to a horizontal projection of the area of the roof. Up to three basic checks are made as follows. This will be indicated in the amendment table on the inside front cover.

Snow load shape coefficient? This results from a appropriate local drift loads as given 7.

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Users of British Standards should make sure that they possess the latest amendments or editions. This can be caused by following symbols apply. 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. Again there may be more recent versions of the document. The value for the snow load shape determining the equivalent slope it is necessary to coefficient for one side of the roof should be zero, distinguish between two types of curved roofs; i.


The correction is based on limited information which shows that the snow density is increased when the snow forms in drifts.

For roofs with no access, the minimum imposed roof load value includes an allowance for repair and maintenance work. The be considered if appropriate. This situation only needs to be be applicable for the same location on the roof.

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. Local drifting against parapets should be determined in accordance with Figure 6 or from the following in which all parameters are as defined in Figure 6. The recommendations of this clause may also be used where a ladder is permanently fixed to allow access to a roof for cleaning and maintenance only.

CP 3, Code of basic data for the design of buildings1. It should be assumed to act vertically and refer to a horizontal projection of the area of the roof. BSWind loads. It presents the UK view on standards in Europe and at the international level.

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

For this type of roof it is necessary transport of snow from one side of the curved roof to to consider two load cases.

For a complex roof value for the snow load shape coefficient should be shape there may be several b cases associated obtained from Figure 3 a ; this value is assumed to with condition b. However, it should be noted that there are some differences as follows: BSBS

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