There has been a major error discovered in the two Russian steel design modules in STAAD.Pro which are resulting in the report of unreliable results and it is recommended that users cease using the Russian steel code at this time.
The error manifests itself in designs of multiple members. The results of the second and subsequent members are being affected by the design of the preceding member. The results can either be conservative or non-conservative.
Currently there is no work around other than only to design a single member. As this is impractical to do in most projects, it is strongly recommended to avoid using the Russian steel designs.
This affects only the v8i SS5 version of STAAD.Pro. (note that previously this was thought to affect older versions too, but this has found not to be the case, V8i SS4 and earlier are found to be ok)
We apologise for the trouble and appreciate that this can be a major inconvenience. The STAAD team is working as quickly as possible to have a resolution posted. Notification will be given in the RSS feed and the Bentley Communities site when a corrected version is available for download.
Please contact Bentley technical support if additional clarification is required.
This issue was addressed in the patch release which included a number of other updates, full details of which are outlined in the posting:-
The details of the problem are to do with the initialisation of variables used in the design. The first member of a design will have these set to zero, which is correct. However, the second and subsequent members will use the variables as they were left by the previous member design. When processing the new member these values may or may not get reset. We are currently running though the testing of the fixes and I hope to have a corrected version available very soon.
Dear Mr. Carlos, could you please give us more information about the errors and the two russian steel design modules which are incorrect as we are using STAAD Pro v8i-SS5 for our Russian code based project. This information could help us a lot. we are also going to in touch with your bentley technical support. if you share the info it could be more helpful to us. Thanks in advance.