Page 378 - Aircraft Stuctures for Engineering Student

Problems 359

1

X

6

P.9.28. A uniform beam with the cross-section shown in Fig. P.9.28(a) is sup-
ported and loaded as shown in Fig. P.9.28(b). If the direct and shear stresses are
given by the basic theory of bending, the direct stresses being carried by the booms
and the shear stresses by the walls, calculate the vertical deflection at the ends of
the beam when the loads act through the shear centres of the end cross-sections,
allowing for the effect of shear strains.

t2.5mm 2
100 mrn 77-
t
1
100
mrn
-t ___ t-
___
A A
!
75
rnrn
I 75 rnrn
100 mm t
100 mm

Fig. P.9.28(a)