Understanding Finite Element Method: Diagonal Values and Calculating K Matrix

[fonseh]

Homework Statement

In the third picture , I don't understand the circled part , add up the values in the diagonal .. How to do that ?

I don't understand how to get k13 , k14 , k21 , k22 , k33, k41 and k42 .

Homework Equations

The Attempt at a Solution

As we see in the second picture , the k21 and k22 = -20 and 20 respectively , why in the third picture , the k1 and k22 become -20 and 40 ?
Is the solution provided wrong ?

 

[fonseh]

I tried add up 20, 40, 100/3, and 40/3 , i get 230/3 , none of the number in the matrix is 230/3!

 

[fonseh]

Can anyone help ?

 

[fonseh]

why there's 3 boxes ? Why don't the author directly put it into the matrix as k11 , k12 , k21 , k22 , k33 , k34 , k43 and k44 only ?

 

[Ray Vickson]

Can anyone help ?

No, I doubt that anyone is willing to help you. In many other threads you have been advised, over and over and over again, not to just post images, but you consistently ignore this advice. Now you see the consequences.

 

[fonseh]

No, I doubt that anyone is willing to help you. In many other threads you have been advised, over and over and over again, not to just post images, but you consistently ignore this advice. Now you see the consequences.

I already highlighted the part i don't understand . This question is rather long . It's difficult to simplify it and type it out . Sorry for the trouble caused

 

[fonseh]

No, I doubt that anyone is willing to help you. In many other threads you have been advised, over and over and over again, not to just post images, but you consistently ignore this advice. Now you see the consequences.

I already highlighted the part i don't understand . This question is rather long . It's difficult to simplify it and type it out . Sorry for the trouble caused