# Shear and Moment diagram for frame question

1. Sep 21, 2013

### getbuckets68

Draw the shear and moment diagrams for each of the three members of the frame. Assume the frame is pin connected at A, C, and D and there is a fixed joint at B.

Please i need help with this .. would be great if anyone can help

2. Sep 21, 2013

### SteamKing

Staff Emeritus
First, determine the reactions at A and D to keep the frame in equilibrium.

3. Sep 21, 2013

### getbuckets68

on A i got 101 KN up and 90 KN to right, at D i got -11 Kn , i am not sure if these are right

Last edited: Sep 21, 2013
4. Sep 21, 2013

### SteamKing

Staff Emeritus
Well, that's easy to check.

Take your reactions an see if they equations of equilibrium are satisfied.

If not, rinse and repeat.

5. Sep 22, 2013

### getbuckets68

think i got the reactions correct but im not sure bout my shear diagram doesnt look right

6. Sep 22, 2013

### SteamKing

Staff Emeritus
Well, I'm not sure either. You'll have to post it.

7. Sep 22, 2013

### getbuckets68

ok here is what ive drawn so far

#### Attached Files:

• ###### IMG_20130922_153514.jpg
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8. Sep 22, 2013

### SteamKing

Staff Emeritus
It's kinda blurry - can't make out any details at all.

9. Sep 22, 2013

### getbuckets68

dw about the pic uptop just the shear diagram..does the shape look right

10. Sep 22, 2013

### pongo38

How do you know the reactions are right? There is no point drawing the moment and shear diagrams if the reactions are not right. The reactions are checkable. So please send your calcs.

11. Sep 23, 2013

### getbuckets68

i already sent my calculations. on reaction A i got 101 KN up and 90 KN to right, on reaction D i got -11 Kn downwards, i am going with these thanks for your help

12. Sep 23, 2013

### pongo38

I haven't seen calcs for reactions, which I believe are self-evidently not correct. (For example, what is the bending moment at point C? I am sure you would say 'zero' because of the hinge there, but have you checked by taking the algebraic sum of moments on each side of C?)

13. Sep 23, 2013

### getbuckets68

yes i am re doing the calculations now.. i will take a section at pin C and start summing from there