With this setting off the Sway/Drift, Wind Drift & Seismic Drift checks are performed for all column stacks and wall panels irrespective of their stack lengths.

With this setting on you can specify a minimum stack length.

The following logic is applied to merging stacks when the setting is on:

1. Start at the topmost stack of the column/wall.
2. If the stack length is less than the merge limit then merge with the stack below.
3. Check again to see if then new length exceeds the merge limit, if not then merge again with the next stack below.
4. Repeat step 3 as required until the stack length exceeds the merge limit.
5. For subsequent stacks repeat steps 2 and 3 as required until the length exceeds the merge limit.
6. When the bottommost stack is reached, if this needs to be merged, merge with the stack above.

Check wind cases only

Allows you to set that the wind drift check performed on all columns only considers the effect of the wind loadcases in each wind combination.

Clear the setting to consider the effects of all loadcases in wind combinations, such as drift induced by gravity loads.

For more information, see: Consider wind cases only for the wind drift check

For more information, see: Set the wind drift limit

The wind drift check can either be performed in two directions (Dir 1 & 2), or for the resultant wind drift direction only. For new models the default is to check for the resultant direction only.

For more information, see: Choose resultant or directional wind drift checks