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RE: Mechanical Properties of Marble

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Hello Dr. Rangelow,

This is the second time you help me, thanks. We suggested that already, but
the owner doesn't want to see any steel at all and the marble company can't
guarantee they can hide it. There is an anchorage system (Italian), that
works sort of what we're proposing, the problem is that that sistem is
designed for a curtain wall and marble plates are joined all together with
structural silicone, so they are somehow joined. Here the owner is asking
for a 1 inch separation between plates so he can put a light behind and it
comes through those spaces. Well that's what he wants. 
I thought about drilling 3/8" holes in the corners of a 4" square, then I
would make a steel plate with four 1/4" nails that fit in those holes and
glue it using epoxic resine, the one that is used to fix steel bars to
existing concrete. This would have the nails and the plate sticked to the
marble plate. They are making a test specimen now and I'm taking it to the
lab tomorrow. In this way, marble plate will only take bearing stresses and
the resine will stop the plate from going out of it's plane. What I'm
planning to get is the force needed to take the anchorage out of the plate,
then with a factor of safety of about 3, I'm calculating the amount of
elements I need to hold safely this plate. Any better ideas are welcome.

Thanks again

Walter Sheen
Lima, Peru

At 08:28 AM 30/09/1998 +0200, you wrote:
>Hi Walter,
>Marble is a very inhomogeneous material.
>To make my point clear about its properties,
>I would rhetorically ask "What are the properties of soil?"
>Following is just the voice of my amateur experience with marble: 
>What I would do is to make a frame of angle section in which
>I would insert the marble plate. Of course, the front of the plate can
>be treated so that it will cover the thickness of the
>angle, thus the angle frame being invisible.
>I hope this hepls.
>Peter Rangelow
>> -----Original Message-----
>> From:	Walter Sheen Paoli [SMTP:wsp(--nospam--at)]
>> Sent:	Wednesday, September 30, 1998 1:33 AM
>> To:	seaint(--nospam--at)
>> Subject:	Mechanical Properties of Marble
>> Dear Sirs :
>> We need to design support elements for a marble plate of 330 pounds (Like
>> a
>> curtain wall). This plate has the form of a trapezoid. The big side is
>> 5.3', the small side is 2.8' and the height is 4.7'.The thickness of the
>> plate is 1.18". This plate will be separated 4 inches of the wall where
>> the
>> supports are fixed. This plate stands all alone and our client does not
>> want the support to be visible. 
>>                                    |             |  Marble Plate
>> /|                                 |             |
>> /|                                 |      _     |
>> /|                                 | __|  |    |
>> /|                                           |_ | 
>> /|Wall
>> /|                                        _
>> /|_________________|  | 
>> /|__________________|    Supports : 3 @ 2' (long side)
>> /|				    2 @ 2' (short side)
>> /|
>> I hope you can see that the support element must not be seen from the
>> front. Now our problem is to dimension this support element, check if the
>> marble plate doesn't break when you put it over it and under seismic and
>> wind load. Supports will be made out steel.
>> Questions :
>> 1.- We need mechanical properties of marble. Does anybody have this
>> information ? 
>> 2.- Is there a better way to support the plate ? I mean, a better detail?
>> Thanks in advance,
>> Walter Sheen, CE
>> Lima, Peru