hw22-24_sol

hw22-24_sol - _W_____._W——»,~ 6.2 A square box beam is...

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Unformatted text preview: _W_____._W——»,~ 6.2 A square box beam is made of two 20 x SO-mm 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 built-up 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 lS-irt 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.

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hw22-24_sol - _W_____._W——»,~ 6.2 A square box beam is...

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