Time History w Concrete Column won't converge to correct Axial reaction

[epratt]

I am analyzing a one story concrete column fibersection with time history earthquake motions.

The mass at the top of column is 90 kips, but when I analyze the time history the nodal vertical reaction jumps all over the place, up to 146 kips, even though the analysis converged successfully.

How do I constrain the analysis to hold the 90 k vertical reaction throughout the motion?

[mohammmad]

Hi,
The forces that you recorded are logical. In the time history analysis, فhe forces resulting from the mass multiplication acceleration. Therefore, you cannot fix vertical reaction throughout the motion.



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