Loads disappear

Re: Loads disappear

Chris Conrad — Wed, 16 Dec 2009 20:10:04 GMT

Any time!

Chris

Re: Loads disappear

CKM — Wed, 16 Dec 2009 19:54:25 GMT

Thank you for explaining. Also thanks for the tip about the floor loads.

Re: Loads disappear

Chris Conrad — Wed, 16 Dec 2009 06:48:36 GMT

I'm not sure which load case you're referring to, so I picked the one that was named "LOAD CASE 8" in both models...just for clarity, that is LC 6 in EX Floor_Calc and it is LC 12 in Monorail_Calc.

In that load case, you see a reduction in the moment applied to beams 32 and 34 in EX Floor_Calc (beams 32, 33 and 34 in Monorail_Calc) because of the stiffening effect of the underslung monorail support beam (the S12x31). Since that two-span beam is modeled as continuous, it is resisting the tendency for beams 32, 33 and 34 to deflect downward.

If this doesn't quite address your concern, please let me know exactly which load conditions you're comparing between the two different models, and I'll study those for you.

I'd also like to offer you a general comment about defining ranges for FLOOR loads. It is generally good practice to define the ranges slightly outboard of the nodal coordinates that define the perimeter members. That was you minimize the potential for errors in the interpretation of your loads as a result of roundoff errors.

Cheers,

Chris

Re: Loads disappear

CKM — Tue, 15 Dec 2009 22:04:14 GMT

I'm wondering about the effect that I see in the analysis results. I did a quick hand calc for a simple beam on the ex floor and came up with an internal moment that matched STAAD results. When I add the monorail, the internal moment goes down, not up as expected.

Thanks.

Re: Loads disappear

Chris Conrad — Tue, 15 Dec 2009 21:39:20 GMT

The Modeling mode is showing the graphic depiction of the FLOOR load in both versions of your model.

Are you able to see the load in Modeling mode? If not, it could be an issue of scale, which you can adjust in the Diagrams dialog.

Or are you describing an effect that you are seeing in analysis results?

Chris