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

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

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

3
(OP)
I've seen this before but it amazes me that Hooke's Law doesn't seem to apply to this bridge....the immovable object meets stupid truck drivers.

http://www.youtube.com/watch?feature=player_embedd...

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

Probably more weak axis bending + torsion on the girders before the load gets up the diaphragm. Don't you think?

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

Hilarious, thanks JAE

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

I heard tthat the DOT has to sharpen the flanges once a week.

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

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

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.

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

Police Officer to truck drive stuck under bridge..."A bit of a problem here, eh?" Truck driver..."Nah, just delivering this bridge."

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

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!

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

Truckers demonstrating their interpretation of doing the pick'n roll.

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

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

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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