Y I

For each joist:

/min = 9.6 x 10~6 m\ A = 8.4 x 10~3 m2, with web and flange thicknesses of 20 mm. For the material of the joist, E = 208 GN/m2 and oy = 270 MN/m2.

Solution

To find the position of the centroid G of the built-up section take moments of area about the centre line of the vertical joist.

2 x 8.4 x 10~3 3c = 8.4 x 10"3(200 + 10)10"3 210

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