×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

laminated glass vertical panels

laminated glass vertical panels

laminated glass vertical panels

(OP)
I have a laminated glass panel wall that is spanning vertically 6 ft and fixed at the base. Typically I have seen modulus of rupture values of 24000 psi for glass panels (tempered/laminated).Also typically a factor of safety of 4 is used to obtain the allowable bending stress = 6000 psi.Does any one know if a lower F.S. can be used or if for laminated glass a higher Mod of rupture can be used? In IBC 2003 ch. 24 a F.S. of 4 is recommended for Guard rail etc. but this is not a guard rail.it separates 2 areas on the same level.

RE: laminated glass vertical panels

I would check out ASTM E-1300.  You can use a higher allowable stress for tempered glass than for annealed.  Right around 10ksi is coming to mind, but I haven't look at it in a while.  Laminated glass requires the use of a load duration factor since the interlayer in laminated glass creeps significantly, only very short duration loading can count on any significant composite action.  Again, check out ASTM E-1300.

RE: laminated glass vertical panels

(OP)
I am somewhat familiar with ASTM  E1300. Do you know where it can be downloaded or viewed without having to purchase it?
Thanks

RE: laminated glass vertical panels

I don't know if it can be.

RE: laminated glass vertical panels

The 10.6ksi that structural EIT is talking about is for edge stress not surface stress which is what will govern in your analysis.

Allowable surface stress is 13.5ksi (tempered Glass)per E1300-07
Allowable edge stress is 10.6ksi ((tempered Glass) per E1300-07



 

RE: laminated glass vertical panels

(OP)
Are you implying that the 6000 psi/ 6 ksi value I have been considering is way too conservative versus your 13.5ksi? also is this value also applicable to laminated glass?

RE: laminated glass vertical panels

That's correct maramos, thanks, I just checked it.  

gazibu-
That value is only applicable to tempered glass, annealed and heat strengthened have different values.  Additionally, that assumes a 3-s load duration and you have to adjust the allowable based on your actual load duration.

RE: laminated glass vertical panels

(OP)
When you say load duration assuming the load in question is wind ,how does the duration come in to play?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources