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Unformatted text preview: _W_____._W——»,~
6.2 A square box beam is made of two 20 x SOmm planks and two 20 x 120mm planks nailed together as shown. Kncwin‘g that the Spacing between the nails is s = 30
mm. and that the vertical sham in the beam is V= 1200 N, dzmrmine (a) the shaming force in each ma“, (2)) the maximum shearing stress in the beam. 3
am nailed together to form a beﬁmi :15, each 2 in. thick,
hat the aﬁowablg shearing force in each “an 3
:3, tical shear. Knowing‘t
tween the nails ‘15 3 ‘m_ subjected to a ver
the aﬁowable shear if the spacing s be is 150 Kb, determine 6,6 The beam shown is fab:
using bolts of %—in. diameter spa
average shearng stress in the bolts the y axis. icated by connecting {we channel shapes ,
an ccd longitudinally even ‘ ‘
j 7.: m.
caused by a shearing form: of 25 géary
(95M: ‘3 («21;+0»2€)><l6x0
(01:de ) “W
6.9 through 6.12 For the beam and loading shown, consider section nm and Pr0b§em 6 .1 0 determine (a) the largest shearing mess in that section, (b) the shearing stress at 13033:
a‘
0.3 m
H ,n 5 lOkN
m 150 mm’ Ajr sed’ian n» h m V = \D kw 553%6,3prm’8? 6.29 Th8 builtup timber beamis subjected to averticai shear ofxz ‘ .
that. the allowable shearing force in the nails is 75 pa, deter 001b.Kne'w  n
permissible spacing s ofthe nails. mm m: large' m :2 i”
a 5&7
i » L7<2><i03 ‘ 3”“ VQ
In: my « ~3+3<l$€5”33m_) " ” a?” “:9
J/ )5!” 4’ As; 3% v 3)
$013545 W  ’2
vI a»
4; 42%" {my} va d 4428;6er 4*) /
I 6.32 The builtnup wooden beam shown is subjﬁcted :0 a Vemcal h '
S ear of Knowing that the nails are spaced longitudinaliy every 50 mm at A
at B, determine the shearing force in the nails (1:) at A, (b) at B (Géﬂd every 2
' x weir, {X = 1 109 mm?) Dimensions in mm 3 connected as shown by %in.diaméter bolts
nal axis of the beam. Knowing that the beam is
determine the averagc shearing stress in the 6.44 A beam consists of three plank
spaced every 12 in. along the longitudi
subjected to a 25004?) verticai shear, bolts. Three 1 X lSirt steel plates are bolted to four L6 X 6 X l angles ; beam with the cross section shown. The bolts have a é—in. diameter 23ml 8
ll . . ally every 5 m. Knowmg that the allowable average
55m 12 ksi, determine the largest permissible vertical Elm Spaced longitudin
' g stress in the bolts is
in the beam. (Given: IX = 6123 inf) life,“ 3‘;
EA
g,
l ...
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This note was uploaded on 05/20/2010 for the course CE 3400 taught by Professor Moorthy during the Spring '09 term at LSU.
 Spring '09
 MOORTHY

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