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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Copyright Copyright subsists in all BSI publications. The values are given as lines of equal load intensity isopleths on the map in Figure 1.
For intersecting pitched pitched or curved roof. This will be indicated in the amendment table on the inside front cover. NOTE In determining the upper bound values for these drift loads account has been taken of known cases of excessive, drifting of snow in the UK. However, it is recommended that they are treated as exceptional snow loads because of the rarity with which they are vs to occur.
BS _Loading for building-Part3 Imposed roof loads_图文_百度文库
Imposed roof loads were previously included in BS The snow loads should be to glazing. In some transport of snow from one side of the ridge to the circumstances more than one of the load cases will other side. Various BSI electronic information services are also available which give details on all its products and services.
When this arises they should be treated as alternatives. It is incorporated by Royal Charter. This British Standard applies to: Contact the Information Centre. This new Part of BS now gives more information on imposed roof loads and in particular gives snow loading data separately, allowing account to be taken of the variation of snow in the United Kingdom and the effect of redistribution of snow on roofs due to wind.
Digest was drafted so that the drift loads could be treated as ultimate loads. Several snow load cases may have to be considered in design to check adequately for the different snow load patterns that can occur. However, a lower probability of exceedance should be considered for the design of: For this type of roof it is necessary to consider two load cases.
This will be indicated in the amendment table on the inside front cover. It is the constant aim of BSI to improve the quality of our products and services. For the purpose of this subclause the roof area is defined as the total covered area, in plan, of the entire building structure.
For these 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.
Table 1 — Values of salt for 6 Snow load on the ground corresponding values of sb 6. Log In Sign Up.
Vs value is assumed to be conditions. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. 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.
In the direction applies where there is an bw change of height parallel to the obstruction or valley it should be greater than 1 m, except that relatively slender uniform and assumed to extend along the complete obstructions e.
Compliance with a British Standard does not of itself confer immunity from legal obligations. 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.
Code of practice for minimum imposed roof loads for use gs designing buildings and building components. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Wherever possible, available observational data have been incorporated in the development of the design models. Code de bonne 6399–3 Title in German Lasten fuer Gebaeuden.
For use in designing buildings and building components which are to be constructed and used in the UK and the Channel Islands. We would be grateful if 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.
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.
BSWind loads. The full list of organizations that have taken part in the work of the Technical Committee is given on the Inside front cover. In general, load cases should be considered to act 7. For a complex roof value for the snow load shape coefficient should be shape there may be several load cases associated obtained from Figure 3 a ; this value is assumed to with condition b. The designer should exercise care, particularly with a structure sensitive to asymmetric loading 63999-3.
The appropriate value for sd is obtained from clause 5. The be considered if appropriate.
This subclause is an optional alternative to 4. As the basic on the ground at 63399-3 site location and altitude the snow load on the ground is 63993- for an assumed site snow load by a factor known as the snow load ground level altitude of m, it is necessary to shape coefficient in accordance with the following adjust the value for locations where the ground level equation: Each load case may require the use of one or more different snow load shape coefficients.
If 6399-3 details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Appendix C Addresses of advisory offices The addresses of advisory offices of the Meteorological Office are as follows. It may result from either the which the drift may form, h0i may be taken as the uniform load case or the asymmetric load case.
The force Fs in kN per metre width exerted by a sliding mass of snow in the direction of slide is calculated from the following equation: Belfast hoi is the height of the obstruction bd metres ; The address of the advisory service of the Building Research Establishment is as follows.
The snow loads should be determined according to clause 7.
These are flat, monopitch, pitched or surrounding roofs or obstructions.