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Unformatted text preview: 6.1 Three full—size 50 X IOOmm boards are nailed together to form a beam that is PROBLEM 51 subjected to a vertical shear of 1500 N. Knowing that the allowable shearing force
in each nail is 400 N, determine the largest longitudinal spacing 3 that can be used
between each pair of nails. SOLUTION I _ g in»? = #(Imcmv = 23.125'xto‘ m“ . 28.125XI0“ Irv2'l A = (looﬂgo) = 5000 m:
3‘ = 5'0 mm Q: A3. : 250%“?3 Mm;
 250 Ito"; m3 V Q (1500 )(15‘0 no“) 3
T 22.n15no" 3333*“) NA" 2 FM, 8 = ZFnu'l : ‘ XIOJS M 3. 13.333Ito‘
3 60 mm E 2 6.1 Three fullsize 50 x IOUmm boards are nailed together to form a beam that is
PROBL M 6' subjected to a vertical shear of 1500 N. Knowing that the allowable shearing force in each nail is 400 N, determine the largest longitudinal spacing s that can be used
between each pair of nails. 6.2 For the builtup beam of Prob. 6.1, determine the allowable shear if the spacing
betweeneachpairofnails is: = 45 mm. SOLUTION I = {a bin" = 1'; (1003050? r 22.nsxto‘ m" = 2%. 125x10“ rn" \ A = (looXSo) = sooo m J": 50 MM G.= A3, ' 2501103 in»? = 2.50on“ m3 % : 1f: 13.5 = 2F :1
. . . VQ _ 2PM
Elainanan 3. T " S
.l. : ZIP“; _, (2)(22.12§xro“)('400)
SDI)" “‘3 42" V V Qs — (250x:0“)(qs'xlo")
:1 x103 N = 2 1m 4 PROBLEM 6.9 15 kips 20 kips 15 kips 6.9 through 6.12
determine (a) the
point a. For the beam and loading showrl, consider section nn and
largest shearing stress in that section, (b) the shearing stress at SOLUTION Bj SijeA'rj Q5 1 9, From 5L ear Au‘ajvém Dd’efwu'ne momerr} 6P {ner‘f‘fa‘ (ask I . 83) 2 (226m: No.33) Q: 2A3 = 22.83 iu’ t: 0.375 In
V0
’5': ——— 2‘: (23M 29. as)
(23:. 74 Hasis) 7" 6.70 k5; j:.nux_...ne\.x..m...;jm' 3:“: .I. «3: 1a,  ~J '1'}.  '.'~_. ...
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 Fall '09
 MOORTHY

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