topic Re: upper flange fully restraint in Robot Structural Analysis Forum

upper flange fully restraint

danielrmc1726 — Fri, 07 Jan 2022 17:56:20 GMT

hello iam trying to design a group of beams, this beams will support a concrete slab and i need to consider the top flange fully restrained, but when i add the position of the bracings there is not any change in the effective lenght of the beam, am using AISC 2016 CODE.

i will appreciate any help

thanks!

Re: upper flange fully restraint

Krzysztof_Wasik — Fri, 07 Jan 2022 18:09:37 GMT

Hi @danielrmc1726

Member critical point is at its begining. Bottom flange might be compressed in that point.

Re: upper flange fully restraint

danielrmc1726 — Fri, 07 Jan 2022 19:34:09 GMT

the beams are released at ends (simply supported) so the bottom flange is in tension in all the lenght, that´s why i want to restrain the top flange , correct me if iam wrong.

Re: upper flange fully restraint

Krzysztof_Wasik — Fri, 07 Jan 2022 21:30:26 GMT

Hi @danielrmc1726

As far as I can check in your screenshots, Steel design calculation note shows negative My moment.

according to sign convention in Robot it suggest compression in bottom flange.