Bending moments and points of contraflexure

[ai93]

Hi
I am attempting a question on moments and beams.
I have attached the question and my solutions so far. But having trouble completing d) and e)
Can someone show how to work out bending moments and the point of contraflexure?
http://[ATTACH=full]199767[/ATTACH] [ATTACH=full]199768[/ATTACH]
[ATTACH=full]199769[/ATTACH]

any help is appreciated thanks

 

[Chestermiller]

What have you done on part d so far. To you know how to determine the bending moment variation, given the shear force variation? How are the two related?

Chet

 

[ai93]

Having trouble doing bending moments and points of contraflexture. That's why I need help!

 

[Chestermiller]

Having trouble doing bending moments and points of contraflexture. That's why I need help!

Are you familiar with the relationship between the derivative of the bending moment with respect to position along the bar and the shear force?
https://www.google.com/webhp?source...ie=UTF-8#q=bending moment shear force diagram

Chet