# Homework Help: Shearing/Bending diagrams, forces acting on beam

1. Mar 3, 2012

### togo

1. The problem statement, all variables and given/known data
- Compute the reactions at the supports
- Draw complete shearing force and bending moment diagrams
- Determine magnitude and location of maximum absolute value of shearing force and bending moment
- Use free body diagram approach to determine internal shearing force and bending moment at any specified point in a beam
- Write equations for all segments of shearing force and bending moment diagrams

2. Relevant equations
M = FD

3. The attempt at a solution

I didn't attempt to finish it since I sorta got stuck. I was looking for examples in the book for how to do this and can't seem to find. Am I even close to correct on either the shearing or bending diagram? thanks

2. Mar 3, 2012

### OldEngr63

Think this one through, and when you do, you should be on the way to a solution.

3. Mar 4, 2012

### togo

alright, so when you have a beam tacked onto a wall as in this example, is it treated the same way as though it was just sitting on a pivot on that end? thanks

4. Mar 4, 2012

### togo

an improvement I hope, still don't know how to approach the bending diagram of moments.

5. Mar 4, 2012

### OldEngr63

Your shear diagram shows a pair of steps, so there should be two different slopes evident on your bending moment diagram. I can't really tell if you tried to show that or not, but it is not very clear on your diagram. The left most slope should be quite a bit higher (magnitude) than the one of the right.

The built-in end does support a moment, unlike the pined end, and that is why the moment diagram does not go to zero on the left end. It comes out at the wall moment value.