Sye,
Thanks for your explanation with examples (values involve). Your previous comment confuse me cause if I were to divide the allowable factor by (I/Cd) will just be multiplying it by Cd inwhich would be the same approach if I were to recalculate the elastic drifts from the table to inelastic. So basically, if from the table of elastic drifts or displacements, we were to amplify it by Cd/I, I will just have to divide the allowable factor (in this case say L/40) with Cd/I. This would practically make sense for the inelastic drift will be higher than that of an elastic one.
See snapshot below
Which again brings me to solicit another item. Please see snapshot below which more or less must be the same with the snapshot above
Take note of the drifts herewith. Now STAAD i believe will give me a value of drif t that correspond to the Vs or V which is Ds or deltaE/R which is both the same.
Now, let us look on the inelastic drift in which the values I would have in tabular form will be multiplied by Cd/I. Now which one would it be? Is it the one shown on the first snapshot or the one shown in the second snapshot? Going to this, I am in agreeable terms that numerically speaking, it would be easier to divide the inelastic displacement factor with Cd/I. But still we need to understand where on this graph the inelastic displacement would fall. Any thoughts on this is greatly appreciated.
On point #1
I really can't pick what you said. As, I am trying to use the example i previously attached, I can't get the figures right. Can you elaborate more on this and use the example snapshot i previously sent as a reference?
On point #2
I get this calculation on the drift per floor. My question on this is that with this two set of tables (one is average displacement and the other is drift), where would I used them from exactly? Say when normally we only check on the allowable drift or displacement which would make the second tabled values useful to me or better yet the ratio would be the one I am to look out for. Now when would be the first tabulation be useful for me as a designer? That is what I am asking.
Again, I thank you for this. I do also encourage others from Bentley to pitch in their thoughts on this matter.
Thanks