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Shear Force Diagram (SFD) & Bending Moment Diagram (BMD) for Cantilever Beam

Dattatray Panke
19/04/2017 0 0

Problem Statement

Draw shear force and bending moment diagrams of the cantilever beam carrying point loads. As shown

in figure:

 

SOLUTION:

Shear Force:

To draw a shear force diagram, first find value of shear force between varying loads.

Let start from left side, Shear force Between point D and C

S.F (D-C) = -100 kg.

Shear force value increases gradually as we move towards fixed end.

Shear force Between Point C and B

S.F (C-B) = -(100 + 200 ) = -300 kg.

Now one can see, shear force between point C and B is the sum of point loads acting up to that point.

Shear force Between Point B and A

S.F (B – A) = -(100 + 200 +300 ) = – 600 kg.

One can see shear force between B and A is the sum of all point loads acting on it. This shows shear

force is maximum at fixed end and minimum at free end of cantilever beam.

 

Bending Moment

Bending moment at point D = B.M (D) = 0

Bending moment at point C = B.M (C) = -(100×1) = -100 kg.m

Bending moment at point B = B.M (B) = – (100×2 +200×1)

B.M (B) = -400 kg.m

Bending moment at point A = B.M (A) = (100×3 + 200×2 + 300×1)

Total Moment at point A = B.M (A) = -1000 kg.m

This shows that maximum bending will be at fixed end. Point loads from free end transfer their bending

strength towards fixed end. At the end it acts as a sum of all bending moments.

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