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The following are the details of an error that has been observed in version 11.3 of RCDC (STAAD Advanced Concrete Design).
For columns that are designed using the Auto Design facility, RCDC allows some further redesign operations to be performed on those columns. Examples of these redesign operations are:
An error is present in the reinforcement that is calculated for ductile columns that are subjected to the afore-mentioned redesign operations if the user performs the following steps in the sequence described
Method to avoid the error:
The error can be avoided if, immediately after performing the redesign operation described above in (a) through (f), the user
(i) Unlocks the file and thus the previous design is discarded
(ii) Performs a new design through Auto-design
Exceptions:
Note that this error does NOT exist in the following cases:
1.Non-ductile columns.
2.Columns of Intermediate frames (ACI), DCM (European - BS EN) and IMRF (Australian)
3.If design is performed with a new RCDC file (first occasion). This is because, as described above, the closing and re-opening the file before performing the above-mentioned redesign operations is a key requirement for this error to manifest.