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teeth

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## Homework Statement

Draw the shear diagram for the compound supported beam.

## Homework Equations

Statics... so sum of moments at any point or forces in any direction are 0

## The Attempt at a Solution

I summed the forces in the y direction, as well as the moments at A and moments at B, but using these 3 equations causes the variables to cancel out when solving for the reactions. I get 0 = 0...

I guess I cannot use two moment equations, but then how am I to solve this? I'm in first year statics.

My equations are...

[tex]0 = \sum F_y = A_y + B_y + D_y -3*6 - 5[/tex]

[tex]0 = \sum M_A = B_y*3 + D_y*9 -3*6*3 - 5*7.5[/tex]

[tex]0 = \sum M_B = -A_y*3 + D_y*6 - 5*4.5[/tex]

Counter-clockwise moment is positive

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