So Let me have this clear out.
Please see file belowImage may be NSFW.
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The L/40 would be the allowable drift. As defined by the code, it is the maximum inelastic diplacement. And the items tabulated are the elastic displacements.
Since I need Cd/I to be incorporated in the elastic displacement to become inelastic and thereby we can compare directly the values and the ratio given in the tabulation, we are to divide the inelastic (allowable) factor of L/40 by I/Cd or just simply by multiplying the same L/40 by Cd/I... Am I correct on my understanding to your reply awhile ago?
Also, a couple of observations and needed more clarification and direction
1. Why does the tabulated ratio had different denominators? How do STAAD compute this ratio in terms of a factor?
2. What is the difference between the average displacement and the drift? What values to use and what would I be needing to understand with these infromation aside from check the lateral displacement (in which STAAD provided two distinct values)? My understanding on this was that the first was the average of the relative movement of the nodes in that storey while the later was the external or edge displacement of the outer frame of the building to that of a plumb line or column line.
I stay attentive to your response on this
