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Hello!

I'm looking for a reference book or website or similar that tells me how to calculate the forces or stresses in the interlayer of laminated glass.

I've been using the program Mepla for analysis and it easily gives the stresses and deflections of the glass but doesn't seem to give the forces or stresses in the interlayer.

This might be a very simple question for someone who is way more familiar with this program than I am.  The website unfortunately is not helpful on this topic.

Thanks! :)

I don't think MEPLA has an option for that, what are you looking to do with the interlayer stress? 

Hello!

I'm looking for a reference book or website or similar that tells me how to calculate the forces or stresses in the interlayer of laminated glass.

I've been using the program Mepla for analysis and it easily gives the stresses and deflections of the glass but doesn't seem to give the forces or stresses in the interlayer.

This might be a very simple question for someone who is way more familiar with this program than I am.  The website unfortunately is not helpful on this topic.

Thanks! :)

I wanted to show the tensile stress of the interlayer had a safety factor of at least 4.0 per code for handrail live loads.

I don't think MEPLA has an option for that, what are you looking to do with the interlayer stress? 

Hello!

I'm looking for a reference book or website or similar that tells me how to calculate the forces or stresses in the interlayer of laminated glass.

I've been using the program Mepla for analysis and it easily gives the stresses and deflections of the glass but doesn't seem to give the forces or stresses in the interlayer.

This might be a very simple question for someone who is way more familiar with this program than I am.  The website unfortunately is not helpful on this topic.

Thanks! :)

I wanted to show the tensile stress of the interlayer had a safety factor of at least 4.0 per code for handrail live loads.

------------------------------
Brenda Moore P.E., M.ASCE
President
BLM Consulting Engineers, Inc.
Midlothian VA

Original Message:
Sent: 12-11-2024 08:47 AM
From: Renn Henry
Subject: Reference for calculating the stress in the interlayer of laminated glass?

I don't think MEPLA has an option for that, what are you looking to do with the interlayer stress? 

------------------------------
Renn Henry, PE
Staff Engineer

Original Message:
Sent: 12-09-2024 11:22 PM
From: Brenda Moore
Subject: Reference for calculating the stress in the interlayer of laminated glass?

Hello!

I'm looking for a reference book or website or similar that tells me how to calculate the forces or stresses in the interlayer of laminated glass.

I've been using the program Mepla for analysis and it easily gives the stresses and deflections of the glass but doesn't seem to give the forces or stresses in the interlayer.

This might be a very simple question for someone who is way more familiar with this program than I am.  The website unfortunately is not helpful on this topic.

Thanks! :)

------------------------------
Brenda Moore P.E., M.ASCE
President
BLM Consulting Engineers, Inc.
Midlothian VA
------------------------------

The hardware vendor will typically have technical data available for a glass shoe or button.

Here is one link with publicly available information that might be helpful.

https://www.crlaurence.com/technicalreference/findByProductCategory/search?s0Category=RailingWindscreenSystems&s1Category=E01_HR&s2Category=E01B_HR&s3Category=&s4Category=&q=E01B_HR%3Arelevance%3Agroups%3AEngineering%2B%2526%2BTest%2BReports

Looking at some past calcs, for 3/4" laminated glass, I used a modulus of rupture of  Fr = 24000 psi and a factor of safety of 4.  The elastic modulus is E = 10000 ksi.  Be sure to check with the glass manufacturer or job specs.  The interlayer should not control the design.  The glass should crack and remain adhered to interlayer after failure. 

I recommend always using a top rail on glass panels.  This ensures the panels deflect together and do not pinch fingers in the joint (differential deflection cannot exceed the thickness).

------------------------------
Chad Morrison P.E., F.ASCE
Professional Engineer
Greenville RI

Original Message:
Sent: 12-11-2024 12:15 PM
From: Brenda Moore
Subject: Reference for calculating the stress in the interlayer of laminated glass?

I wanted to show the tensile stress of the interlayer had a safety factor of at least 4.0 per code for handrail live loads.

------------------------------
Brenda Moore P.E., M.ASCE
President
BLM Consulting Engineers, Inc.
Midlothian VA

Original Message:
Sent: 12-11-2024 08:47 AM
From: Renn Henry
Subject: Reference for calculating the stress in the interlayer of laminated glass?

I don't think MEPLA has an option for that, what are you looking to do with the interlayer stress? 

------------------------------
Renn Henry, PE
Staff Engineer

Original Message:
Sent: 12-09-2024 11:22 PM
From: Brenda Moore
Subject: Reference for calculating the stress in the interlayer of laminated glass?

Hello!

I'm looking for a reference book or website or similar that tells me how to calculate the forces or stresses in the interlayer of laminated glass.

I've been using the program Mepla for analysis and it easily gives the stresses and deflections of the glass but doesn't seem to give the forces or stresses in the interlayer.

This might be a very simple question for someone who is way more familiar with this program than I am.  The website unfortunately is not helpful on this topic.

Thanks! :)

------------------------------
Brenda Moore P.E., M.ASCE
President
BLM Consulting Engineers, Inc.
Midlothian VA
------------------------------