RAM Structural System Concrete Pan Joist

RE: RAM Structural System Concrete Pan Joist

Seth Guthrie — Wed, 08 Jul 2020 22:44:57 GMT

I ran a test model in v17.01 with some pan joists and rectangular beams. The difference in the total reactions when using or not using the beam self-weight works out in my case, i.e. it's only the weight of the pan joist stems (and the entire rectangular beam weight) that is applied.

RE: RAM Structural System Concrete Pan Joist

Seth Guthrie — Wed, 08 Jul 2020 14:19:09 GMT

I would have to see your model to say. Perhaps your flanges overlap? Secure File Upload

RE: RAM Structural System Concrete Pan Joist

Andrew Pacifico — Wed, 08 Jul 2020 11:32:46 GMT

I understand that the program will count the slab and the overlapping area of the beam in its self weight calculation if the beam is rectangular, but the pan joist command creates t-beams. This is where I am confused, that link says in t-beam self weight calculations the slab is calculated separately from the t-beam. So why do I get an answer that is 2x my expected moment if I include the self weight of the slab?

RE: RAM Structural System Concrete Pan Joist

Seth Guthrie — Tue, 07 Jul 2020 20:43:09 GMT

Please refer to: https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/3037/ram-ss-gravity-loads-faq