Re: Bridge Ratings and Tractors, dog test

Posted by buickanddeere on June 11, 2006 at 10:20:21 from (209.240.120.65):

In Reply to: Re: Bridge Ratings and Tractors posted by Jim J. (WA) on June 10, 2006 at 21:29:15:

It's possible the bridge would be less stressed with the backhoe on the trailer rather than driving the backhoe across solo.
The backhoe's weight is concentrated over a short wheelbase vs. the span between the highway tractor's rear axles and the low bed axles.
A backhoe tends to bob and bounce a bit. That could easily double or triple the load on the bridge per bounce.
Also is the bounce of the tractor is "in rhythm" /same frequency or a harmonic. The backhoe could shake/bend the bridge to bits as it sways/bounces with higher amplitude.
Anyone who has stood on an elevated wooden floor like a hayloft or wooden foot bridge. They have suddenly felt the floor/bridge shake, feeling it was starting to give way underneath them. The cause turned to be just the dog trotting along the same structure.

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