STAAD QUESTION

[kevo_55]

^^ Well, if you can sweet talk you boss into getting a few seats of RISA 3D I think you'll find that you can get MUCH more done.

Then again, that won't be cheap. But, it would be cheaper than getting a single seat of NASTRAN or ABAQUS.

 

[Vinsanity]

Brick veneer? so in that case you can model it as an eight noded element a good model can by a 1x1x1 block and all you can get from STAAD are element stresses and deflection of course, based from this ouptput you can design the reinforcements needed, this the most exact method for this type of structure, I know this because I have studied this in MS courses and some seminars with STAAD and SAp 2000 and ETABS.

You can also model it as a shear wall type of structure.

 

[StructuralPoke]

Brick veneer? so in that case you can model it as an eight noded element a good model can by a 1x1x1 block and all you can get from STAAD are element stresses and deflection of course, based from this ouptput you can design the reinforcements needed, this the most exact method for this type of structure, I know this because I have studied this in MS courses and some seminars with STAAD and SAp 2000 and ETABS.
You can also model it as a shear wall type of structure.

It's just veneer - the inherent stiffness is neglected in favor of the steel frame doing all the work. The brick is simply held to the stud walls w/ brick ties. Nothing to transfer load to the brick or any way for the brick to resist the load.

And I can get the deflections of the frame out of STAAD -- it's the deflection-limiting criteria that is not working.

Still no answer from STAAD by the way...

 

[kevo_55]

Brick veneer? so in that case you can model it as an eight noded element a good model can by a 1x1x1 block and all you can get from STAAD are element stresses and deflection of course, based from this ouptput you can design the reinforcements needed, this the most exact method for this type of structure, I know this because I have studied this in MS courses and some seminars with STAAD and SAp 2000 and ETABS.
You can also model it as a shear wall type of structure.

Vinsanity,

Why would you model the brick (cladding) with your building frame? The cladding is responsible to resist it's own loads, transfer them to the MFRS, and to be able to move with the building.

I have always seen that the gladding dead weight added to the MFRS and then neglected in all other calculations. I have never seen it modeled with the building to give it more "stiffness."

 

[Vinsanity]

kevo,

no i'd didnt model the cladding on the building frame. i was thinking that the structure described here is made of bricks.

Struct...,

you might use the command in STAAD, Story Drift, with this command you can see the output based on limiting deflection that you are talking about, the story drift is calculated in very story of the building at a specific node.

hope this helps.

 

[dastuff]

Risa has a STAAD convertor. Why don't you attach the file (minus relevant info for security sake, although a 2d frame I wouldn't consider any kind of security risk ) have someone import it into RISA and give it a shot.

I use staad (mainly for aluminum) and risa for everyone else, but haven't ever been very concerned w/ deflection limits sorry.

 

[dastuff]

Although that will all change when RISA gets an AL check at the end of the year...

Then I'm going to give STAAD a quick kick in the pants out the window.... Freaking Fortran based systems... The amount of times a model of mine has failed because the stupid ";" was grayed out is incalculable. And do you know how hard that is to catch....

Really... Freaking.... Hard...

 

[StructuralPoke]

Oh -- the actual check of the frame isn't the problem -- just STAAD's *******ized deflection check. It used to work, I swear...

Didn't know about "Story Drift" command. I shall try that in future models...

 

[Vinsanity]

Oh -- the actual check of the frame isn't the problem -- just STAAD's *******ized deflection check. It used to work, I swear...
Didn't know about "Story Drift" command. I shall try that in future models...

Struct Poke,

this is an example of story drift output and it is close to your l/500 something that you specified, please see attached file.

hope this helps.

 

[StructuralPoke]

Struct Poke,
this is an example of story drift output and it is close to your l/500 something that you specified, please see attached file.

hope this helps.

That's quite a handy command. Thanks for that!

 

[Vinsanity]

That's quite a handy command. Thanks for that!

THis a video animation of 4 story building with lateral deflection captured from ETABS on its mode shape 3. This one of the projects Ive been working. Check this link.

http://www.youtube.com/watch?v=UidQcRh991Q