Steel Buildings in Europe

Title Worked Example – Fire safety strategies and design approach of steel floor beam 3 of 10 6 - 51 Shear resistance: V c,Rd = V pl,Rd = M0 v y 3  A f = 3 1, 0 275 2567   = 407,7 kN > V Ed = 96,6 kN  OK 2.2.3. Deflection δ = EI w BL 4 k 384 5 = 3 4 4 10 10 8356 210000 7000 6 , 5 3000 384 5       = 34,7mm< 200 L = 35mm  OK Hence, the selected section IPE300 satisfies the requirements at normal temperature. 3. Fire safety strategies and design methods The objective of fire safety design is to demonstrate that the beam satisfies the regulatory requirements of 60 minutes fire resistance, R60. 3.1. Passive fire protection Passive protection includes board, sprayed and intumescent coatings 3.1.1. Section factor of unprotected / protected beam b t t w f h   w w f w 0,5 1,5 ht b t t b h t A V        w w f 0,5 0,5 ht b t t b h A V     3 side protection possibilities and A/V ratios. (a) 3 sides profile protection; (b) 3 sides box protection For either the unprotected section or 3 sides profile protection using sprayed or intumescent coatings, as shown in the above figure (a), the section factor is: A m / V =       w w f w 0,5 1,5 ht b t t b h t     =       150 7,1 10,7 0,5 300 7,1 300 7,1 1,5 150        = 200 m -1 For 3 sides box protection using fire board, as shown in (b) above, the section factor is: [ A m / V ] b =       w w f 0,5 0,5 ht b t t b h    =       150 7,1 10,7 0,5 300 7,1 300 0,5 150       = 145 m -1