Advanced Package Training Scaffolding 2011.1 - Scia-Software GbR

3. Load cases and combinations
General
Type of load cases
There are three main types of loads which need to be considered [EN12811-1, 6.2.1.]:
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a) Permanent loads: these shall include the self weight of the scaffold structure, including all
components, such as platforms, fences, fans and other protective structures and any ancillary
structures such as hoist towers.
b) Variable loads: these shall include service loads (loading on the working area, loads on the side
protection) and wind loads and, of appropriate, snow and ice loads.
c) Accidental loads
The permanent loads are inputted as the self weight in Scia Engineer.
The only accidental load specified in the European Standard is the downward loading on the side
protection [more info in EN12811-1, 6.2.5.1].
The variable loads can be considered as the service loads and the wind load.
The service loads are considered in Table 3 of EN 12811-1:
Each working area is capable of supporting the various loadings q1, F1 and F2, separately but not
cumulatively.
q1: Uniformly distributed service load (EN12811-1, 6.2.2.2)
Each working area is capable of supporting the uniformly distributed loads, q1 as specified in the
table above.
F1 and F2: Concentrated load (EN12811-1, 6.2.2.3)
Each platform unit is capable of supporting the load F1 uniformly distributed over an area of 500mm
x 500mm and, but not simultaneously, F2 uniformly distributed over an area of 200mm x 200mm.
The position of each load is chosen to give the most unfavourable effect.
When a platform unit is less than 500mm wide, the load may be reduced for this unit in proportion to
its width, except that in no case shall the loading be reduced to less than 1,5kN.