Steel Buildings in Europe

6 - 49 Worked Example – Fire safety strategies and design approach of steel floor beam 1 of 10 Made by YGD Date 07/2009 Calculation sheet Checked by DGB Date 07/2009 Worked Example: Fire safety strategies and design approach of steel floor beam This worked example illustrates the fire safety design of a simply-supported steel beam using fire strategies and design approaches described in this publication. Five different strategies are discussed to give the designer various alternatives of fire safety solutions. These include passive protection, alternative structural solutions, simple calculation models, tensile membrane action and FRACOF software. The prescriptive approach and simple calculation models were used to verify the fire resistance of the beam. The figure below shows the floor system of a typical multi-storey office building. The beams are simply supported and they are required to have a 60 minute fire resistance under the standard fire exposure, i.e. R60. This example will focus on the design of one of the secondary beams. This beam has to resist and transmit the load from the dashed area and is constructed using an IPE300 in S275 steel. 7.0 m IPE300 IPE300 IPE300 IPE300 3.0 m 3.0 m 3.0 m Floor construction 1. Design Data 1.1. Steelwork properties Yield strength: f y = 275 N/mm 2 Elastic modulus: E = 210 kN/mm 2 Unit mass: ρ a = 7850 N/mm 2