Product: | STAAD.Pro | ||
First Affected Commercial Version: | 20.07.11.33 (v8i) | ||
First affected QA&R Version: | 20.07.11.50 (v8i) | ||
Fixed and Released in Version: | |||
Area: | Seismic analysis as per IBC 2012/2015/2018 | ||
Issue #: | A-1073141 |
When carrying out response spectrum analysis with IBC 2012/2015/2018, if the user-provides accidental
eccentricity factor (ECC) as negative, the program always considers a value of -0.05 in the calculation. In other words, the torsional responses are generated based on ECC = -0.05, for any negative value input for ECC. This may lead to unconservative torsional responses for cases where the input ECC < -0.05.
The issue will occur when ALL the following conditions are true:
1)a response spectrum analysis is performed with –
a.IBC 2012
b.IBC 2015
c.IBC 2018
2)the value of user-provided accidental eccentricity (ECC) factor is negative (except ECC = -0.05).
The bug does not lead to any error when the user-provided value of ECC is either a positive quantity or is equal to (-0.05). Refer to Table 1 for details.
Workaround
No workaround is available as of now for this defect.
.Solution
The defect will be addressed in the next scheduled release of STAAD.Pro ( 2023 version ) expected around Middle of 2023.