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Neutral axisBiaxial bending 
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#1
Apr414, 06:13 AM

P: 38

How can the neutral axis of a concrete column under biaxial bending be determined. I mean if the load P is given along with the eccentricities ex and ey, how could the N.A. location and orientation be computed?
Thank you. 


#2
Apr414, 11:27 AM

P: 561

Since concrete and steel are both nonlinear materials the only accurate way to do it is numerically using trial and error.



#3
Apr414, 11:49 AM

P: 38

Well I'm willing to make a program using Mathematica or a spreadsheet in excel in order to create the interaction curve of a column,so trial and error is no problem. Can you explain how shall I do it? Should I assume an initial N.A and then do the computations, and after that check if the computation check with the N.A assumed position?



#4
Apr414, 01:15 PM

P: 561

Neutral axisBiaxial bending
That's pretty much it. Generally you have the vertical value of c and the rotation angle θ to locate it.
Now if you are doing an interaction curve that is a little different because now you are finding capacities which I think will turn out to be a little easier to do. A good reference is Collins & Mitchell's "Prestressed Concrete Structures". 


#5
Apr414, 02:36 PM

P: 38

Thank you for your help.



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