Sir, I prepared a model in STKO....I found the answers using both Elastic section and Fiber Section. All properties were kept same. They why am I getting variation in Modal Time Periods.
With Elastic Section, I got T1 = 1.299 seconds whereas with Fiber section I am getting T1 = 1.2444 seconds.
Also, I have verified the value T1 using Elastic section in SAP2000. The value matches exactly.
Is this any mistake in my model or it is common thing with fiber section ?
Thank you in advance.
Fiber section vs Elastic Section
Re: Fiber section vs Elastic Section
If in the fiber section you use an elastic material (equal to E/G used in the elastic section) the responses should be equal, but only in theory. In practice, the fiber section is used to obtain an approximate solution , in fact the section is not continuous, but made of a finite number of fibers.
So, for example, the area will be equal, but the second moment of inertia will not!
Just to do a test, try to increase the number of fibers, the finer the mesh, the closer the results
So, for example, the area will be equal, but the second moment of inertia will not!
Just to do a test, try to increase the number of fibers, the finer the mesh, the closer the results