Continuous Beam design

[GordonSharp1992]

how do i model a continouis beam with a roller support at the mid span. i need the beam to be continous.

also how do i model a joint to have a semi rigid/pinned support. with a different stiffness.

thanks

[Artur.Kosakowski · Accepted solution]

how do i model a continouis beam with a roller support at the mid span. i need the beam to be continous.

It should be enough to  define a node with the UZ blocked at the point where the support is located.

also how do i model a joint to have a semi rigid/pinned support. with a different stiffness.

Use the elastic (tab) support definition

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[GordonSharp1992]

i get insability how can i change this

in all directions how do i change this

do i leave Ux and Ry unticked ?

[Artur.Kosakowski]

Attach the model please.

[GordonSharp1992]

heres the model

i need to model semi rigid/pinned supoports at node 3 and 4

and a contiouous beam from 1-3

with a roller at the point show

[Artur.Kosakowski]

I'm not sure if I understand this description correctly. Could you make a sketch of the model and indicate which d.o.fs you want to block, have elastic, release in particular nodes please?

[GordonSharp1992]

the structure is a cantilever extention. from nodes 1 to node 3 is a continuous beam with a roller support at location node 2. i want to make it cantilever but i am struggling !

i also want to make node 3 and 4 semi rigid/fixed .

i have attached the poster for my structural project if this helps

[GordonSharp1992]

jo

[Artur.Kosakowski · Accepted solution]

The modified model  as on the picture you attached

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[Artur.Kosakowski · Accepted solution]

the structure is a cantilever extention. from nodes 1 to node 3 is a continuous beam with a roller support at location node 2. i want to make it cantilever but i am struggling !

i also want to make node 3 and 4 semi rigid/fixed .

 And the model that (I hope) matches this description

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[GordonSharp1992]

thank u this is very helpfull! howvere i keep getting instability at node 2 ( between the contiousous beam ) ! do i have to model the releases or is it just on the supports! or do i have to change flanges ? im usure ! appoligies i am new to robot and taking a while to get the hang of things.

[Artur.Kosakowski · Accepted solution]

In the model you attached you defined the compatible nodes in such a way that node 2 is not connected with any element of the model so you may delete this definition to get rid of the instability error.

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[GordonSharp1992]

i have tried this everal times it keeps coming up with instability i have joined the two beams with the -fxf and kept the roller support unjoined i dont know what to do !?

[Artur.Kosakowski · Accepted solution]

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[GordonSharp1992 · Accepted solution]

took me a while ! but i got there thank u for the great help ! structure seems to be working all well thank you

[GordonSharp1992]

if i now wanted to model a fixed  spring at the top left hand node ! how would i do so ! i have a picture attrached of what i think it would look like !? wetrher it is a roller or pinned or fixed im not sure !

[Artur.Kosakowski · Accepted solution]

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[GordonSharp1992]

perfect thanks i take it there is more opptions in urs as its 3D ?! and what sort of value could i give for this ? is 12345 okay im not sure what to use ?

[Artur.Kosakowski]

12345 stands for the stiffness of the spring and this is the value you should know. I'm sorry but I don't understand the other part of your question.

[GordonSharp1992]

thanks i understand now !