1. The intention of this Part is to ensure that the structure of a building is safe. The safety of a structure depends on several factors and the following criteria are relevant in all cases -
a. loading;
b. properties of materials;
c. structural analysis;
d. details of construction;
e. safety factors;
f. workmanship; and
g. the nature of the ground.
2. Where approaches to construction other than those given in the deemed-to-satisfy provisions are adopted then the criteria given above in paragraph 1 are particularly relevant, especially in relation to any numerical values of safety factors. A change in any one of these criteria may disturb the stability of the structure.
3. Loads used in calculations must allow for possible dynamic, concentrated and peak load effects that may occur.
EUROPEAN PRE-STANDARDS (ENV)
4. The British Standards Institution has published, for trial use by designers, most of the ENV Structural Eurocodes prepared by the European Standards Organisation (CEN). Each of these pre-standards are prefaced with a National Application Document (NAD) which renders the standards suitable for use in the UK. The practical experience gained in these trials is providing valuable feed back to the CEN project teams responsible for the conversion of the ENV pre-standards into full EN standards.
5. When the ENV Eurocodes are eventually published as EN’s they will be referenced in the deemed-to-satisfy provisions in Part C. In the mean time, the BSI pre-standards may be used as an alternative approach for satisfying the relevant standards in Part C. There will be a period of transition during which time Eurocodes and national standards will be allowed to co-exist. This period of co-existence has yet to be determined, but upon its expiry the corresponding national standards will be withdrawn by BSI.
STRUCTURE
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(1) Every building shall be so designed and constructed that the combined loads to which the building may be subject are sustained and transmitted to the ground without impairing the stability of the building. |
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(2) Subject to paragraph (3), every building of five or more storeys shall be so designed and constructed that in the event of damage occurring to any part of the structure of the building the extent of any resultant collapse will not be disproportionate to the cause of the damage. |
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(3) In calculating the number of storeys for the purpose of paragraph (2), no account shall be taken of any storey within a roof space where the slope of the roof does not exceed 70 degrees to the horizontal. |