Design of Steel Framed Buildings without Applied Fire Protection
Fire safety is an important consideration in the design of multi-storey buildings
and this publication describes ways of achieving the necessary levels of safety
without the use of applied fire protection. According to the Regulations, the
elements of structure of most moderate sized offices require 60 minutes fire
resistance when tested in a standard fire resistance test, whilst those in two storey
offices normally require only 30 minutes fire resistance. The fire resistance
requirements for buildings in the UK are specified in The Building Regulations(1).
The requirements vary, up to 240 minutes, depending on the building height, size
In most modern steel framed buildings, the members would typically be protected
from the effects of fire by spray or board protection, or intumescent coatings.
These methods have proven more economical than the more traditional approach
of encasing the steel in concrete or masonry.
The required amount of protection to steel frames is dependent on the type of
member, its shape and the fire resistance to be achieved. However, The Building
Regulations do not specify that a structure must have fire protection, only that it
must have fire resistance. This is an important distinction, as many types of steel
members can economically achieve up to 60 minutes fire resistance without
requiring applied fire protection.