The Mexico bridge appears to be prestressed concrete which failed in the middle at the highest area of bending stress. Likely a design or...
Latest update is an anchor failure was the original cause of the collapse as I was trying to discuss with Peter when he went off the rails.
Put the muzzle brake on it if the recoil bothers you. Wear ear plugs. The blast must come back towards you or the break will not work. I would, and...
Peter, Good luck with your analysis. I do not appreciate your insinuation that I am referring to an article that does not exist.
The Miami Heralds article I can't find was said to be a recent announcement by the NTSB stating that number 11 was being tightened when the bridge...
Peter, I can not find the thickness of the 8 x 12 anchor plate in member 11. Can you? It looks too thin on the drawings for the fores it is taking.
I could not find the Miami article, but here is another written earlier that I missed....
Peter, Over here it is considered unethical to comment negatively about another engineers work without full information so I cannot join you in...
Peter, Finally, new information. The NTSB said the workers were tightening the post tension rods as we suspected, adding compressive stress to...
Peter, We are beating a dead horse. The failure of #11 is a given we started with. We know it failed and that it was not heavily reinforced. In...
It is a pdf of a live spread sheet that calculates 2187.19 by the method I sent you. 1.2 is suggested as the load is well known. It is...
If 10 number 7 bars (unknown) I think 14 or so: Bridge wt= 950 Tons = 1900 kips A little less as ½ of top cord and north column weight would...
Peter, This is why I quit participating in this forum. Unfortunately, the trolls show up who know nothing about what's being discussed and weigh in...
Ok, Have a haggis for me in Deacon Brodies for me and I'll eat some southern fried chicken for you.
Sorry, I'm now away from my office and programs. Will not likely return until next Saturday before Easter. That's why I sent you the info so you can...
Fyi: http://www.ce.memphis.edu/6136/PDF_notes/i1__axial.pdf if you really want to know how concrete columns work, this is it.
Once the first diagonal in compression gave up its load or most of it, the load transferred to to the adjacent tension diagonal which become a...
Your measurement of the vertical confirms my suspicion that the bars were number 8"s or 1" diameter bars. I used #11's as the largest they could be...
I don't know how to upload this file. It is a pdf document of the colmn calculation. It is called a P-M diagram. May cause more confusion that...
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