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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Superseded by BS EN Subscribing members of BSI are kept up to date with standards 639-3 and receive substantial discounts on the purchase price of standards. It is included for designers who wish For Scotland; bw understand the parameters which influence the Meteorological Office.
No loads incidental to maintenance are appropriate to glazing. It can also be caused by redistribution of snow which affects the load distribution on only a local part of the 699-3, e. Imposed roof loads were previously included in BS 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.
It should be the most onerous value arising from uniformly distributed snow on the roof slope under consideration.
The treatment 63999-3 snow drifting against obstructions in section two is similar to that given in BRE Digestissued in Octoberbut now withdrawn. The primary loading conditions to be considered are: It is incorporated by Royal Charter.
Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. This code can be used for design using permissible stresses or partial factors. Condition b can be caused by a redistribution of 7. For the purpose of this subclause the roof area is defined as the total covered area, in plan, of the entire building structure.
Worldwide Standards We can source any standard from anywhere in the world. Building Research Advisory Service, b In some cases, a check is then made to ensure Building Ns Establishment, that there is sufficient snow available on the bbs Building Research Station, to form a drift to the top of the obstruction.
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.
If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Code of practice for imposed roof loads Licensed Copy: It is not intended for use in calculating snow load shape coefficients. This results from individually and not together.
The this arises they should be treated as alternatives. BS ,Code of practice for dead and imposed loads.
Sb a complex roof shape there may be several load cases associated with condition b. Digest was drafted so that the drift loads could be treated as ultimate loads. The Red document status indicator indicates that the document is an old version The document has likely been withdrawn by the publisher, also the meta data presented here may be out of date as it is no longer being bz by the editorial teams at NBS. These are flat, monopitch, pitched or surrounding roofs or obstructions.
BS ,Code of practice for dead and imposed loads. The appropriate value for sd is obtained from clause 5.
General 1 Scope 6399-3. The full list of organizations that have taken part in the work of the Technical Committee is given on the Inside front cover. Click to learn more. It is the constant aim of BSI to improve the quality of our products and services.
The full list of organizations that have taken part in the work of the Technical Committee is given on the Inside front cover. This can be caused by general debris or ice and consideration may need to be given in design to what happens to the drain water if this occurs. For this direction of slide is calculated from the following case the variation in the direction parallel to the equation: NOTE The sopleths in Figure 1 are derived from analysis of data from a limited number of recording stations and therefore unusual local effects may not be included.
Several snow load cases may have to be considered in design to check adequately for the different snow load patterns that can occur.
BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. NOTE For simplicity of calculation it is assumed that the same value for the basic snow load on the ground should apply for altitudes between 0 and m.
BS _Loading for building-Part3 Imposed roof loads_图文_百度文库
Providing the above conditions are met, an allowance should be made for an imposed load equal to or greater than that which produces the worst load 66399-3 from one of the following: Details and advice can be obtained from the Copyright Manager. Where the roof is to have access for specific usages the imposed bss for c and d above should be replaced by the appropriate imposed floor load as recommended in 5.
In provides for loads incidental to maintenance on all evaluating 4. Care should be taken in the selection of b3 the greater length of building from which snow is available to be blown into the drift. 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 in designing buildings and building components. They are corrected for an assumed ground level datum of m above mean sea level and have an annual probability of exceedance of 0. Log In Sign Up. 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.
Included in this category is drifting against local obstructions not exceeding 1 m in height and also drifting on canopies projecting not more vs 5 m from the face of the building over doors and over loading bays, irrespective of the height of the obstruction formed. The total snow load per metre width in all elsewhere on the roof. 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.
For roofs with no access, the minimum imposed roof load value includes an A Altitude of site in metres above mean sea allowance for repair and maintenance work. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies.