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...so the diaphragm shear on a bridge when truck(s) hit it is... 3

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Probably more weak axis bending + torsion on the girders before the load gets up the diaphragm. Don't you think?
 
Hilarious, thanks JAE
 
What they don't show is anything substantial hitting it. We used to have a low-clearance underpass that went under a railroad track. It wasn't that low, more like 13'-6" or so. Anyway, a truck at speed with a lowboy trailer and big trackhoe caught it with the trackhoe boom, and that was the unstoppable force hitting the immovable object, and that bridge got replaced then.
 
Police Officer to truck drive stuck under bridge..."A bit of a problem here, eh?" Truck driver..."Nah, just delivering this bridge."
 
This is a railway bridge...probably as strong laterally as vertically...shorter span, too.

Note that there is so little deflection upon impact that the lights don't even seem to be affected!
 
This is a common problem in NYC and surrounding counties. Some out of state truckers don't know that a parkway in NY is for passenger cars only. Many of the bridges have low clearance. 9'-6" is not uncommon.
 
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