Page 369 - Aircraft Stuctures for Engineering Student

350 Open and closed, thin-walled beams

1

a ---
3

4

5

Fig. P.9.10

P.9.11 Determine the position of the shear centre S for the thin-walled, open
cross-section shown in Fig. P.9.11. The thickness t is constant.
Ans. m/3.

Fig. P.9.11

P.9.12 Figure P.9.12 shows the cross-section of a thin, singly symmetrical
I-section. Show that the distance ts of the shear centre from the vertical web is
given by

- - 3PU - PI
Es
d - (1 + 12p)
where p = d/h. The thickness tis taken to be neghgibly small in comparison with the
other dimensions.