Virtual Joists and Joist Girders

[carnahanad]

Hello,

I recently watched the webinars from SJI discussing the use of Virtual Joists and Virtual Joist Girders in RISAFloor. They discuss after using the Virtual Joist in the software, to use typical call outs on plan. What I don't seem to grasp is how to turn the VJ callout in RISA into a typical ##K## Joist. They example in the presentation is just a uniformly loaded joist. The best I can figure is to use the "I" value of the VJ and back figure using the joist length and depth to get a "Red" value to check against the joist table. I thought the point of the VJ and VJGs was to be able to use standard joist callouts on drawings.

Has anybody else used the Virtual joists and joist girders in RISA or other software?

 

[Triangled]

well,
I virtually remember taking this virtual course a few years ago when I had virtually no work, (back when the banks got virtually bailed out, but, no, not us),and felt the course to be of virtually little use, at least to me. I realize this is of virtually no use to you, but I waited all day for someone else to reply....

 

[Guastavino]

I use RISA a lot but don't trust it to size joists correctly with anything but a uniform load. That was likely the purpose of that webinar, but if I were you, I'd develop your own excel sheet to envelope point loads, convert to equivalent uniform loads based on max shear, bending, and deflection.

Also, if you have RISA, I assume you have support maintenance. Call them up. I do it often and it's included in your maintenance. They are very helpful in specifics, but I would still use an excel or hand check for something like that. Even if you get RISA working, to double check from time to time.

 

[SethGuthrie]

RAM Structural System can also do Virtual Joist design.

https://communities.bentley.com/pro...st-girder-tables-in-the-ram-structural-system