Allowable frame deflection

In Canada, that would be h/400. Which code are you using?

Thanks to you, Bruce!

I am reallly sorry as I forgot to mention RCC frame deflection and I want to know the constraint particularly for RCC frame.

Usually I follow ACI code and I am limited with only the older version, ACI 318-2005.

Here, I did not find such relation of sway with height of structure.

Well you are using h/400. Is it Canadian code?

Furthermore, if you know any ACI limitation on RCC frame sway, you are sincerely requested to let me know.

Tx

Hasan

Hasan,

I was quoting from Table D1, Appendix D of Handbook of Steel Construction, published by Canadian Institute of Steel Construction. It should be noted that it is not a mandatory part of CSA-S16 (the steel design code in Canada).

I cannot find any reference to reinforced concrete frame deflections in the Canadian code.

Thanks, Bruce.

It will appreciable if anybody can provide a refference about code restraint of RCC frame deflection.

Hello sohel,

I don't think I've ever come across any sort of Code Constant for concrete frames before....not sure it exists or is so obscure that no one uses it or little discussed.

When you're talking about RCC frames, are you looking at skyscrapers or much lower buildings and/or structures?

With RCC frames, I'd think the constant would be much higher so as to avoid cracking of the concrete, and non-structural design elements such as glass curtain walls, sheetrock and the like.....maybe use an allowable side-sway limit of, say, L/1000 or higher versus the L/480 used in steel construction???

Now you've got me very curious and now have to check around in all my texts and reference manuals/CD's!

Just wondering what the newest tallest building in the world (Abu Dubai) used for side-sway limits??? Didn't that building feature a RCC Central Core? Or did it also feature permeter RCC frames tied-back into the core? I haven't heard too much about it? Maybe someone from Owens & Merrill knows the answers to all the questions generated so far in this posting. Didn't they design the beastie??????

A very good question to ask!!!! Congrats!!!!!

If I find anything I'll get back to you pronto!!!

Have a great sunny day!

Hi

Thanks for your interest.

There must be a limitation on RCC frame sway because the economy/total moment resisting capacity of the frame depends on the rigidity of the same.

If I allow more frame sway then the flexural capacity will obviously be less.

Some of my known person advise me to use h/500, however, they could not provide me any reference.

Well, I am trying hardly to find out the mentioned restraint as per any the CODE reference. I must let you know if I find.

All of you are also requested to let me know if you have any idea.

Tx.