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Institution Forums > General > Frameless glass cantilevered stair balustrade View modes: 
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mandregomes@gmail.com - 28/06/2016 15:55:52
   
Frameless glass cantilevered stair balustrade
Hi

I am a structural engineer and I am working now on the design for a glass balustrade to install in a steel cantilivered stair. The main objective is to use just 2 standoffs in each thread/step to support the cantilivered glass balustrade. I am struglling to find some simple analitical calculations to verify that standoff connections between the steel thread and the glass...

I think the best would be to make a FEM analysis, but I would like to keep it more simple. I found many researches on the internet, but they were not clear enough for my case.

If anyone have some information or documents about this, or can help me somehow I would appreciate a lot.

Thanks for the attention.

Best regards

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Member (MIStructE)
Stewart Robinson - 30/06/2016 10:09:47
   
RE:Frameless glass cantilevered stair balustrade
Hi,

Don't know if you already know this, but the Institution brought out a manual on the structural use of glass in buildings some time ago, just checked and it was updated in 2014. I don't own a copy but would imagine it would be a good place to start if you're looking for a sound initial design philosopy.

Regards,

Stewart


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Graduate
Zeregaber Woldu - 07/08/2016 21:55:22
   
RE:Frameless glass cantilevered stair balustrade
Hi,

The connection requires a non-linear analsis. The stress distribution at the connection point is a bit tricky and there are different methods (glass solely supported by friction, glass is resting on the special washers etc).

I would go for a non-linear analysis softwares (typically SJ Mepla, RSTAB).

Hope it is helpful enough.

Regards,
Zerit

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Graduate
Andy Beeton - 14/08/2016 15:34:17
   
RE:Frameless glass cantilevered stair balustrade
In fact glass is one of the most linear elastic materials we use. Non-linearity comes in to play when you have large deflections, and this is sometimes significant for glass, so you may have geometric non-linearity but not really material non-linearity. This may be particulalrly the case where you are dealing with connections and are interested in localised effects around the connections. Of course, you might be talking about the connection fasteners which, being steel most probably, may have non-linear characteristics. However, if you are into non-linear territory whith your connections, I would begin to fear for the force/stress distributions in the glass fixing if the fastener is deforming significantly.

By all means, I would recommend, as someone has already, studying the institution's handbook and also Haldiman's book.

Mounting the fasteners in the holes is critical. Too much distortion could allow the fastener to overcome the resiliant bearing and produce metal to glass contact, which you must avoid. You should also look at, and try to limit, differential movements between the treads (or whatever they are fixed to) and to make them stiff so you don't set up secondary forces between the fixings that are hard to predict. If you can do that, you may not need to resort to FE, which might not give you the answers you are looking for and may even raise more questions that answers! Manual design methods may suffice unless it is a very specialised or tricky application.

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mmiller_glazier@hotmail.com - 21/11/2016 20:09:23
   
RE:Frameless glass cantilevered stair balustrade
What is "Haldimans book"? A google search yeilded no results. where can I find it?

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Laura Cooper - 22/11/2016 09:21:27
   
RE:Frameless glass cantilevered stair balustrade
I think it is this one:
Haldimann
, M., Luible, A. and Overend, M. (2008) Structural use of glass.Zurich: IABSE-AIPC-IVBH. (IABSE Structural Engineering Documents, 10).
It can be purchased direct from the IABSE shop at http://www.iabse.org/IABSE/publications/Shop/Online_Shop.aspx?ShopCCO=2#ShopCCO. 
We have this item in the IStructE Library but you need to be an IStructE member in order to borrow it.

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qanddstairs@gmail.com - 26/12/2018 06:32:42
   
RE:Frameless glass cantilevered stair balustrade
I think you should google it u can find a lot on stairs and balusters

https://qanddstairs.com


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