Skip to main content
M
MikeArmstrong1-Visitor
1-Visitor
August 30, 2019
Solved

Bending Moment and Shear Force Diagram Issues

  • August 30, 2019
  • 2 replies
  • 7335 views

I have started drafting some material for student engineers relating to bending moments and shear forces. Initially,  the SF and BM were calculated long hand and the plotted graphs look correct. However, when integration and differentiation is used the graphs are not correct. I am using M15 with Windows 10.

 

Thanks,

 

Mike

Best answer by -MFra-

I broke the definite integral into three parts and the defect disappears, look here:

MA answer 2.jpg

2 replies

-
-MFra-21-Topaz II
21-Topaz II
August 30, 2019

Hi, 

I will go on so:

MA answer.jpg

 

M
MikeArmstrong1-VisitorAuthor
1-Visitor
August 30, 2019

Hi,

I have tried this and still get the same error. I have just modified the functions and swapped the 'otherwise' statements to 'if' as shown below:

This has corrected the differentiation error when plotting the shear force diagrams, but there is still an error with the bending moment (MM(x)) plot when integrating V(x).

Thanks,

Mike

-
-MFra-21-Topaz IIAnswer
21-Topaz II
August 30, 2019

I broke the definite integral into three parts and the defect disappears, look here:

MA answer 2.jpg

    M
    MikeArmstrong1-VisitorAuthor
    1-Visitor
    August 30, 2019

    Good work and thanks for the effort.

     

    Could you please post the worksheet so I can investigate further?

     

    Mike

    -
    -MFra-21-Topaz II
    21-Topaz II
    August 30, 2019

    Voilà:

    Terms & ConditionsAccessibility statement