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Unformatted text preview: 1.25 A gnu—diameter steel rod AB is ﬁtted to a round hole near end C
of the wooden member CD. For the loading shown, determine (a) the maxi—
mum average normal stress in the wood, (19) the distance b for which the av
erage shearing stress is 100 psi on the surfaces indicated by the dashed lines,
(c) the average bearing stress on the wood. A “’ “i w yawﬁ gem {its /  w an e» 1 w wwmw Wm ejm anij {ml}
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ti ﬁfxaggtgiéé “g k 3’ 1.39 Knowing that the ultimate load for cable ED is 100 kN and that a
factor of safety of 3.2 with respect to cable faiiure is required, determine the magnitude of the largest force F that can be safely applied as shown to mem—
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{:«W’mwww Five?” W 1.5% In the steel structure shown, a 6—mmdiameter pin is used at C and
—mrndiameter pins are used at B and D The ultimate shearing stress is
150 MPa at all connections, and the ultimate normal stress is 400 MPa in link _
BDi Knowing that a factor of safety of 3.0 is desired, determine the largest Frontwew
load P that can be applied at A. Note that link ED is not reinforced around the
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r—J avg : 1,17 Two wooden planks, each i in. thick and 9 in, wide, are joined by
[ha dry mortise joint shown. Knowing that the wood used shears off along its
grain when the average shearing stress reaches 1.20 ksi, determine the magni
tude P of the axial load that will cause the joint to fail. g “5/3! 9”} x I ‘ 3W}; ’ 5 ,«vr ‘“ Nam: 52%: aware we " mg g a“;
SQiy‘biiim ; . 6 load P applied to a steel rod 18 distributed to a timber support ‘ by an annular washer. The diameter of the rod is 22 mm and the inner diame
ter of the washer is 25 mm, which is slightly larger than the diameter of the
hole. Determine the smallest allowable outer diameter d of the washer, know
ing that the axial normal stress in the steel rod is 35 MPa and that the average
bearing stress between the washer and the timber must not exceed 5 MP3. Fig. PLZO ix
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 Spring '09
 MOORTHY

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