Steel elements deemed to satisfy 15-minute fire resistance

For the purposes of this technical booklet the following types of steel elements are deemed to have satisfied the minimum period of fire resistance of 15 minutes when tested to the European test method – (i) Beams supporting concrete floors, maximum A/V = 230 m⁻¹ operating under full design load. (ii) Free standing columns, maximum A/V = 180 m⁻¹ operating under full design load. (iii) Wind bracing and struts, maximum A/V = 210 m⁻¹ operating under full design load. The meaning of 'A/V' is given in BS 5950-8 Structural use of steelwork in building - Code of practice for fire resistant design and is in line with European terminology. (This section factor was previously known as H/A.)