2.6 kN 2.4 kN-m B A 1.0 m 1.0 m 1.0 m
To draw the shear force or bending moment diagram, one should first determine the reaction at the supports. These reaction can be determined using static and dynamic equilibrium condition.
After determining the reaction, use sign convention to draw the diagram. The shear force at any section is algebraic sum of all the forces either left hand side or right hand side, same is applicable for bending moment. It is algebraic sum of all the moments due to reaction, load and concentrated moment either on left hand side or on the right hand side.
The assumed reaction at the support can be shown as follows:
Balance the force in vertical direction as follows:
Now, the correct direct can be represented as shown
The shear force at different points can be determined as follows
Here, the sign is taken negative for the downward force when moving from left to right.
Draw the shear force diagram as follows
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