Lighting columns - Part 3-3: Design and verification - Verification by calculation
This European Standard specifies the requirements for the verification of the design of lighting columns by calculation. It applies to lighting columns of nominal height (including any bracket) not exceeding 20 m. Special structural designs to permit the attachment of signs, overhead wires, etc. are not covered by this European Standard.
The requirements for lighting columns made from materials other than concrete, steel, aluminium or fibre reinforced polymer composite (for example wood, plastic and cast iron) are not specifically covered in this standard. Fibre reinforced polymer composite lighting columns are covered in this standard in conjunction with EN 40-7.
This European Standard includes performance requirements for horizontal loads due to wind. Passive safety and the behaviour of a lighting column under the impact of a vehicle are not addressed. Such lighting columns will have additional requirements (see EN 12767).
The calculations used in this European Standard are based on limit state principles, where the effects of factored loads are compared with the relevant resistance of the structure. Two limit states are considered:
a) the ultimate limit state, which corresponds to the load-carrying capacity of the lighting column;
b) the serviceability limit state, which relates to the deflection of the lighting column in service.
NOTE In following this approach, simplifications appropriate to lighting columns have been adopted, These are:
1) the calculations are applicable to circular and regular octagonal cross-sections;
2) the number of separate partial safety factors have been reduced to a minimum;
3) serviceability partial safety factors have a value equal to unity.