Cantilever column

[ateestructural]

I have a cantilever column of length 1m.

I have applied a lateral load of 200 kN uniformly distributed over the length of the column

I have carried out a geometric non linear analysis and see that the (maximum deformed) statistics are as follows:

-314.40 mm(translation X)
0.00 (translation Y)
-49.62 mm (translation Z)
0.00000(rotation X)
-0.38930 (rotation Y)
0.00000 (rotation Z)

I get a very high axial force on the column of 1565.60 kN

Since the translation and rotation is high I am guessing my high value of axial force is because my load (lateral) of 200 kN is NOT a follower load i.e. it DOES NOT REMAIN perpendicular to the column throughout. Thus, the load has a contribution / component along the axial direction resulting in high axial forces.

Is that possible? Any thoughts?

 

[MotorCity]

I have not run the numbers, but perhaps the axial load is due to a combination of self weight and the coupling force at the face of the column due to the moment. (Personally, I would use hand calcs to solve this problem)

 

[hokie66]

What is the section of this "column"? Your numbers are nonsensical.

 

[BAretired]

Why are you guessing about the direction of the applied load? Don't you know what you input into the software?

No matter what the direction of load might be, there is no possibility that the axial force could be greater than 200 kN.

BA

 

[IDS]

This is double-posted in the FEA forum, where it is stated that the actual applied load is 10,000 kN.

My response there was:

10000 x sin(0.39) is about 3800 kN, so that seems to the right order of magnitude, compared with your axial force.

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/