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sm10 52

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PROBLEM (10.52 ) A simple beam AB is subjected to couple M0 at midspan acting as shown in
Fig.P10.52.Determine:
(a) The equation of the deflection curve.
(b) The deflection at midspan.
(c) The magnitude and location of the maximum deflection.
(d) The slope at the free end.
SOLUTION
y
M0
A
L/2
L/2
C
L
M0/L
B
x
M0/L
M0
L
x − M 0 < x − >0
2
L
M
L
EIv ' = 0 x 2 − M 0 < x − > +C1
2L
2
M
M
L
EIv = 0 x 3 − 0 < x − > 2 +C1 x + C2
6L
2
2
EIv '' =
Boundary conditions:
v(0) = 0 : C2 = 0
M L
v( L) = 0 : C1 = − 0
24
Equations (a) and (b) become
M0
L
EIv ' =
[12 x 2 − 24 L < x − > − L2 ]
24 EIL
2
M0
L
EIv =
[4 x 3 − 12 L < x − > 2 − L2 x]
24 EIL
2
(a)
(b)
(1)
(2)
These lead to the results given in solution of Prob. 10.31.
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