topic Re: Model a beam hanged to frame rafter in Robot Structural Analysis Forum

Model a beam hanged to frame rafter

ahmadmahrous_1 — Wed, 10 Nov 2021 06:58:31 GMT

Hi,

I want to model a beam that is supported by columns hanged from frame rafter as shown in attatched pic:

beams 7,8 are supported by columns 4,5,6 which are hanged from rafter.

Thank You,

Re: Model a beam hanged to frame rafter

Simau — Wed, 10 Nov 2021 09:30:10 GMT

Hi @ahmadmahrous_1

According to your screenshot you already modeled your structure.

So what is your probleme?

Re: Model a beam hanged to frame rafter

ahmadmahrous_1 — Wed, 10 Nov 2021 09:44:57 GMT

What I am asking about how to model the load transfer scenario from beams 7,8 to 4,5,6 to the rafter

so the beams 7,8 are continuous beam supported on 3 points and columns 4,5,6 takes reactions of beams as axial force then transfer it to the rafter as concentrated loads.

Re: Model a beam hanged to frame rafter

Simau — Wed, 10 Nov 2021 12:42:29 GMT

Scenarion 1

All your structure (1to8) is poured and supported till concrete setting

Scenarion 2

1 2 3 are poured and after concrete setting you add 4 5 6 7 8.
You may use Phases

Re: Model a beam hanged to frame rafter

ahmadmahrous_1 — Wed, 10 Nov 2021 12:54:08 GMT

Could you please explain?

This is a steel structure all members are steel

Re: Model a beam hanged to frame rafter

Simau — Wed, 10 Nov 2021 13:13:59 GMT

After reflection, for your structure, it is not necessary to use the phases.

So concrete or steel structure, just run your model with all kind of loads you need

Re: Model a beam hanged to frame rafter

ahmadmahrous_1 — Wed, 10 Nov 2021 13:33:41 GMT

Thank you @Simau

I did but then the beams transfer load only to columns 4,6 and not 5 and act as simply supported beam not continuous as no support at column 5. How to tell robot that column 5 is also supporting the beams??

Re: Model a beam hanged to frame rafter

Simau — Wed, 10 Nov 2021 14:17:11 GMT

It depends of stiffness off different members

Please attach your model for analyse

Re: Model a beam hanged to frame rafter

Simau — Wed, 10 Nov 2021 14:20:04 GMT

if the stiffness of 4 6 is much greater than that of 5, 4 will not transmit any load

Re: Model a beam hanged to frame rafter

ahmadmahrous_1 — Wed, 10 Nov 2021 16:45:03 GMT

All Members are of the same section

Her is the Model I want results of beam 7,8 to be the same as 9,10 as they have the same load, section and length.

Re: Model a beam hanged to frame rafter

Simau — Wed, 10 Nov 2021 20:04:57 GMT

Something like this

model attached