Question

For the beam below, construct expressions for the shear V (x) and the moment M(x) using free- body diagram of a cut structure. Answer: M(x) = M(x) = M* - (M*/L)x.

For the beam below, construct expressions for the shear V(x) and the moment M(x) using free- body diagram of a cut structure.

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Answer #1

LET REACTION AT HINGE SUPPORT = RA AND REACTION AT ROLLER SUPPORT BE RB

RA+RB=0 (NO EXTERNAL FORCE IN Y DIRECTION)

HA=0 (NO EXTERNAL FORCE IN X DIRECTION)

TAKING MOMENT ABOUT POINT B

RA*L+ M*=0

RA= -M*/L

RB = M*/L

SHEAR FORCE TO THE RIGHT OF X FROM A SUPPORT IS

V(z) = RA

V(x)= \frac{-M^{*}}{L}

MOMENT AT X

M(x) = M*-R, X

M*  

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