g
,
, PROBLEMg6.1
Usingg theg methodg ofg joints,g determineg theg forceg ing eachg memberg ofg theg
trussgshown.gStategwhethergeachgmembergisgingtensiongorgcompression.
SOLUTION
Freegbody:gEntireg truss
:
Fyg =g0 Byg =g Bgyg =g
: 0 0
−gBxg(16gin.)g−g(240g lb)(36g in.)g=
M =g 0: g0
Bxg =g −540g kN Bgxg =g540glb
Fxg =g0
: Cg −g540g lbg+g240g lbg=g0
Cg =g300glb Cg=g300glb
Freegbody:gJointgB
:
FABg FBCg 540gl
=g =g
b5 4 3
Copyrightg©gMcGraw-HillgEducation.gPermissiongrequiredgforgreproductiongorgdisplay.
, PROBLEMg6.1g(Continued)
Freegbody:gJointgC
:
FACg FBCg 300gl
=g =g
b13 12 5
FBCg =g720glbg g (checks
)
Copyrightg©gMcGraw-HillgEducation.gPermissiongrequiredgforgreproductiongorgdisplay.