Imposed Load On Roof Eurocode

Roofs do not qualify for load reductions.

Imposed load on roof eurocode.

On roofs particularly for category h roofs imposed loads need not be applied in combination with either snow loads and or wind actions. 6 3 1 2 10 a reduction factor for imposed loads for area aa may be used and should be determined using aa 1 0 a 1000 0 75 na 1 bs en 1991 1 1. Imposed load is defined as the load that is applied to the structure that is not permanent and can be variable. These will be covered in a forthcoming note p this article was updated in october.

Reductions can not however be applied to roof imposed loads. The method given below complies with the bs en 1991 1 1 uk national annex but differs from that given the eurocode. Actions on structures. Loads specified are represented by uniformly distributed loads udl concentrated loads line loads.

En 1991 1 1 imposed loads 6 2 1 floors beams and roofs 1 p for the design of a floor structure within one storey or a roof the imposed load shall be taken into account as a free action applied at the most unfavourable part of the influence area of the action effects considered. A ψ factor is applied to the imposed load case in a combination then as stated in the base eurocode cl 3 3 2 the imposed load reduction should not be applied at the same time. If the imposed load is considered as an accompanying action i e. In eurocode phraseology it is described as a quasi permanent variable action.

Floor and roof areas in buildings are sub divided into 11 categories according to use.