## Fire resistance

Check validity of using Method A and Table 5.2a:

/0ff x 0.7 x 3.325 i.e. < 3.0 m OK. e = M02yy / NEd = 89.6 x 106 / 1129.6 x 103 = 79 mm emax = 0.15h = 0.15 x 300 = 45 mm . no good.

<BS EN 1992-1-2: 5.3.3(3)> <BS EN 1992-1-2: 5.3.2 &

Check validity of using Method B and Table 5.2b:

emax = 0.25b = 75 mm .'. no good. Use BS EN 1992-1-2 Annex C Tables C1 - C9.

(0 = Asfyd / Acfcd = 0.022 x (500 / 1.15) / (0.85 x 30 / 1.5)

0.56

i = radius of gyration = (I / A) = 300 / 1205 = 87 mm 2 = 2327 / 87 = 276 n = N0Ed.f1 / 0.7(Acfcd + Asfyd)

= 0.7 x 1129.6 / 0.7(3002 x 0.85 x 30 / 1.5 + 1964 x 500 / 1.15) = 1129.6 / 2383.9 = 0.47

Table C5 (( = 0.5, e = 0.25b) ^ bmin = 235, a = 35 mm

<BS EN 1992-1-2: 5.3.3> <BS EN 1992-1-2: Annex C>

Using 4 no. H20 gives m = 0.34, n = 0.54 and bmin = 310 mm . no good!

Table C8 (m = 1.0, e = 0.25b) ^ bmin = 185, a = 30 mm for m = 0.56: bmin = 228, a = 35 mm

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