# Shear and Moment diagram for frame question

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

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

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:
Staff Emeritus
Homework Helper
Well, that's easy to check.

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

If not, rinse and repeat.

getbuckets68
think i got the reactions correct but im not sure bout my shear diagram doesnt look right

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

getbuckets68
ok here is what ive drawn so far

#### Attachments

• IMG_20130922_153514.jpg
7.8 KB · Views: 1,700
Staff Emeritus
Homework Helper
It's kinda blurry - can't make out any details at all.

getbuckets68
dw about the pic uptop just the shear diagram..does the shape look right

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.

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

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?)

getbuckets68
yes i am re doing the calculations now.. i will take a section at pin C and start summing from there