Unformatted text preview: third quadrants. Then σz(A) = 0.27 × 74.1 + 0.65 × 38.4 = 45.0 N/mm2 (tension) (compression) σz(C) = 0.27 × (−25.9) + 0.65 × (−86.6) = −63.3 N/mm2 The maximum direct stress therefore occurs at C and is 63.3 N/mm2 compression. S.16.2
The bending moments halfway along the beam are Mx = −800 × 1000 = −800 000 N mm My = 400 × 1000 = 400 000 N mm By inspection the centroid of area (Fig. S.16.2) is midway between the ﬂanges. Its distance x from the vertical web is given by ¯ (40 × 2 + 100 × 2 + 80 × 1) x = 40 × 2 × 20 + 80 × 1 × 40 ¯ i.e. x...
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 Winter '08
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