Example 21 Plastic Crosssection Properties Section

Determine the position of the plastic neutral axis -Aplastic, the plastic section modulus Sxx and the shape factor u for the welded section indicated in Figure 2.46.

Figure 2.46

(i) Position of plastic neutral axis (-^plastic)

For equal area axis:

(ii) Plastic section modulus (Sxx): (1st moment of area about the plastic neutral axis)

Sxx=[(90x10)x20]+[(15x15)x7.5)] + [(75x15)x37.5)]=61.875x10

61.875x10* 34.9x10'

1.77

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