I have a question about the weight limits for glass shelving.?

2021-01-18 6:05 am
I've had a display cabinet in which I've been displaying model cars for the past 20 years.  I've decided to add another shelf, but, after reading a few websites, am beginning to wonder if I've been WAY overloading these.  The shelves are 1/4" glass, 12 1/2" deep and span 90 1/2", with a support in the middle (45 1/4").  I haven't a clue if they're tempered, but I'm guessing they are not. The cars I display are not small and usually weigh 2-3 pounds each. On any particular row, I display about 17 cars (with one usually right on the center support).  So, that's eight on each span, at almost three pounds each.  

I ran some of the calculations on various sites and, apparently, I'm only supposed to put seven pounds on the span.  How in the world are supporting 24 pounds???   Again, I've had no issues for almost 20 years, but now I'm wondering if this is an accident waiting to happen.   I can add some more supports, but I just wanted some thoughts on why this hasn't catastrophically failed already.

I've included a photo to show you the current setup.
更新1:

As I mentioned earlier, I'm not certain if the shelves are tempered or not.  I know the front piece is tempered because there's a mark indicating as such.  The shelves do not have the stamp.   If you run the calculations using annealed glass, the weight limit drops to 16 for the whole shelf (or 8 between each support).  That's what's blowing my mind.

回答 (3)

2021-01-18 11:39 am
✔ 最佳答案
I think that middle shelf brace might have something to do with it. I would probably add two more, one on either side, just to be safe. 
2021-01-18 11:47 am
Your current configuration should hold 60 lbs.  I ran the numbers on a glass calc site. 
copied below
2021-01-18 8:25 am
At 3 lbs each, you are not even halfway to the weight limit.
Besides, you would now by now if you were.


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