STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

RE: STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

Sye — Thu, 23 Apr 2015 22:03:37 GMT

Thanks to all of you who joined the SIG session this morning and the following Interactive Learn Session on DIRECT ANALYSIS. I hope we have answered all the questions that were sent to us. If there are any that were not answered, please feel free to post it in this forum and we will answer those. That brings us to the end of today’s session. Thanks again for choosing STAAD.Pro as your analysis software and we look forward to organizing more of these sessions in the near future.

RE: STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

Sye — Thu, 23 Apr 2015 21:42:50 GMT

Here is an updated version of the model used in the SIG session. The warnings are now taken care of. Had to add a couple of X braces to add to the lateral stability of the frame. I noted that some of the members are failing in design but of course that is expected as there are no design parameter definitions in the file. One can always add parameters like UNT UNB to specify the correct unbraced lengths and the model can also be refined further but even without these, this model may serve as a useful practical example for users using the Direct Analysis feature.

communities.bentley.com/.../Plant_2D00_Bldg3_2D00_US_2D00_Direct_2D00_Analysis_2D00_2010_2D00_SIG_5F00_modified.std

RE: STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

Sye — Thu, 23 Apr 2015 21:11:19 GMT

During the SIG session this morning, some of the users wanted to know more about the 18 warnings obtained during the analysis. I am checking the model now and these were being caused by the fact that there were zero stiffness at certain locations in the model for example at the intersection of the X braces. Since the braces were specified as TRUSS members, at the intersection there was no ability to carry an out of plane force. These zero stiffness were causing high displacements at the nodes which were eventually causing the direct analysis to diverge leading to additional warnings. Working on the model right now. Will upload it shortly ...

RE: STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

Sye — Thu, 23 Apr 2015 19:56:19 GMT

During the SIG session this morning someone was asking about the Tau-b reporting. Just wanted to mention that information on Tau-b are printed as part of the analysis output file. If such messages are not required to be printed, one can turn those off by using the following SET command as part of the command file.

STAAD SPACE

START JOB INFORMATION

ENGINEER DATE 16-Nov-08

END JOB INFORMATION

INPUT WIDTH 79

SET NOPRINT DIRECT

UNIT FEET KIP

JOINT COORDINATES

...

RE: STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

Sye — Thu, 23 Apr 2015 19:39:29 GMT

Here is another wiki that I created just now. This question is often asked by users attempting to do DIRECT ANALYSIS in STAAD.Pro
communities.bentley.com/.../20964.does-specifying-the-notional-load-factor-as-0-002-automatically-define-notional-loads

RE: STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

Sye — Thu, 23 Apr 2015 18:33:39 GMT

Did you check out the wiki articles on Direct Analysis in the Bentley Communities forum ? If not, here is where you can find these
communities.bentley.com/.../19522.direct-analysis

RE: STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

Sye — Thu, 23 Apr 2015 18:12:38 GMT

Yes. Let me check with the presenter for the day and I will get it posted in this forum thread.

RE: STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

Sye — Thu, 23 Apr 2015 18:11:08 GMT

Just posted the following wiki article communities.bentley.com/.../20961.error-fyld-outside-the-normal-range-for-steel

Please feel free to check out at your convenience

RE: STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

goVOLSPerry — Thu, 23 Apr 2015 18:10:40 GMT

Did you state in on line Staad Pro Direct Design session just ended that you would provide an input file that includes the CODE CHECK command?