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HELP how to calculate membrane stress in a section

HELP how to calculate membrane stress in a section

HELP how to calculate membrane stress in a section

(OP)
Hello everyone. I have a problem in calculating the first step in FAQ794-982: How to calculate the membrane and bending stresses in a section:

" 1)Take the average of each stress component. In formula:
σim=( ∫σi dx )/t
where t is the thickness (length of segment), x=0 to t is the abscissa along the thickness and i=1 to 6.
Now you have a single set of six (membrane) stress components"

I start with 2 matrix 3x3 (points start/stop SCL):

     σ(xx)   σ(xy)   σ(xz)  
S=   σ(xy)   σ(yy)   σ(yz)
     σ(xz)   σ(yz)   σ(zz)

The rotation matrix is A (3x3)

The new Stress tensor is rotated in local cordinates and is: Sn= A(transposed)*S*A (2 matrix for points start/stop SCL)

How can i do this calculate? σim=( ∫σi dx )/t

The result is 2 matrix? (all the elements of matrix Sn  /t  ?)

surely wrong

Thanks

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