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Unformatted text preview: 08Ch08.qxd 9/18/08 694 11:06 AM Page 694 CHAPTER 8 Applications of Plane Stress MAXIMUM SHEAR STRESS AT POINT B MAXIMUM SHEAR STRESS AT POINT C sx 0 sx 0 sy 0 sy 0 txy
I (2 t) T d2
2 Ip A Pure shear a sy sx
2 tmax txy 19.943 MPa txy 2 b + t2
19.94 MPa tmax
txy 23.738 MPa
I (2 t)
b + t2
2 Pure shear tmax Problem 8.5-17 A sign is supported by a pole of hollow circular 8 ft cross section, as shown in the figure. The outer and inner diameters of the pole are 10.5 in. and 8.5 in., respectively. The pole is
42 ft high and weighs 4.0 k. The sign has dimensions 8 ft 3 ft
and weighs 500 lb. Note that its center of gravity is 53.25 in.
from the axis of the pole. The wind pressure against the sign is
(a) Determine the stresses acting on a stress element at point
A, which is on the outer surface of the pole at the “front”
of the pole, that is, the part of the pole nearest to the
(b) Determine the maximum tensile, compressive, and shear
stresses at point A. ; 23.7 MPa Hilda’s Office 3 ft 10.5 in.
8.5 in. 42 ft X X
Section X-X ...
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