calculate holes position in the glass

[gil]

I would like to fix glass as an image. the problem that I pose as estimating the position of the hole so as not to go and reduce the resistance of the glass.we hypothesize to have a glass plate, this has its resistance to both vertical thrust along the larger sides of the glass acting perpendicular to the surface.

If I fix the glass by means of a pin placed inside a hole I will have to make the hole not too close to the edges, otherwise a board too small will not have the initial flow rate.

there are rules (a few 12150) that suggest the hole position according to the thickness of the glass, but are indications to avoid breaks during the tempering or drilling. I don't think it's about resistance.

so if I have a glass of 10mm thickness and I make 25mm holes leaving 150mm on board from the edge or respected the rules above. But does the plate resist a push like before? and how do we take account of the support surface of the inerts ? is possible a maximum estimate? are there tables to refer to?

thank you all will give me a few minutes

 

[Zurtolo]

I would like to fix glass as an image. the problem that I pose as estimating the position of the hole so as not to go and reduce the resistance of the glass.View attachment 52994we hypothesize to have a glass plate, this has its resistance to both vertical thrust along the larger sides of the glass acting perpendicular to the surface.

If I fix the glass by means of a pin placed inside a hole I will have to make the hole not too close to the edges, otherwise a board too small will not have the initial flow rate.

there are rules (a few 12150) that suggest the hole position according to the thickness of the glass, but are indications to avoid breaks during the tempering or drilling. I don't think it's about resistance.

so if I have a glass of 10mm thickness and I make 25mm holes leaving 150mm on board from the edge or respected the rules above. But does the plate resist a push like before? and how do we take account of the support surface of the inerts ? is possible a maximum estimate? are there tables to refer to?

thank you all will give me a few minutes

hi, the theory (westergard ) says that the axial effort in the perforated plate with a circular hole is accentuated by the triple in the hole position. the axial effort then decreases as you move away from the hole then returns to the nominal value (i.e. the value you would have without carving) at a distance equal to about the triple of the hole radius. should be so anyway if you look for the westergard formula you can calculate everything. among other things perhaps westergard (or griffith who also studied problems of this type) studied the thing right on the glass. on the engineer's manual or on the roarks form you find the formulas.

 

[antonio_sc]

Hi.
First of all, structural glass is a material that, unlike steel, does not have any yielding for which it tends to collapse (has an elastic behavior until breaking). .
Moreover, in the presence of cracks, it reacts differently:
- if the slot is in traction opens
- if the slot is in compression tends to close (the stress state goes in favor of the mechanical resistance of the material)
that I know there are some prescriptions:Moreover, especially if exposed to the weather, it should be washed on the edges.

 

[exxon]

Here's an answer that deserves a lot of hat.

I never needed to do these jobs, but the treatment is still interesting. What book is it?

 

[antonio_sc]

Hello exxon
there are several sources available on the topic (e.g. haldimann, m, luible, a & overend, m, structural use of glass)
but most contain a lot of theory. . more "practical" information can be found online (such as links below):https://www.metroglass.co.nz/catalogue/041.aspxhttps://www.metroglass.co.nz/catalogue/042.aspx

 

[gil]

I believe that the measures for the holes are related to the norms (I do not remember which) for the processing and tempering of the material. but to verify that the position of the hole does not affect the thrust resistance?