Hasty Bridge Classification
how often do you encounter, on dirt & back roads, bridges you can't pass?
obviously this one at 6000# is far too light for your 18'000# vehicle, I haven't seen any bridges rated that low yet, but I have seen 5 & 6 ton limits every so often?
thanks
steve
This is an important consideration for sure!:ylsmoke:
As an Army Engineer it is also right up my lane.:coffeedrink:
Rather than looking both ways sneakily and hoping no one is looking :snorkel: I would recommend at least a hasty classification.
Certainly a good lookey-loo is critical and a lot of "gut-feel" is involved but for those without much experience at material failure (that's not the time to gain the necessary experience either!:Wow1
I offer that the GTA 05-07-012 Tank Commander's Bridge Crossing Booklet is a tool that provides some the math to determine a genuinely safe crossing. I can email the file as it's too large for an attachment (885kb) or you can find it online rather easily. I do caution that it is for "tanks" so it is designed for 30ton and 70ton tracked vehicles.
The old FM 5-170 Engineer Reconnaissance manual or the new FM 3-34.170 of the same title has an appendix devoted to bridge classification and both recording and reporting using DA Form 1249. It's all MOMENTS and SHEAR for the most part...and you want to avoid failure of course.
If you do decide to cross...don't change your mind halfway across - keep going (unless it collapses in front of you)!:smiley_drive:
Too bad I can't find the photo of the failed Bailey Bridge from WWII that was used in my Officer Basic Course.
Jonathan