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calendar   Monday - June 17, 2013

Hone Your Bridge Skills



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Sure, you’re thinking “Warren pony truss with outriggers”. You’ve shown us a million of them Drew.

And generally, you’d be right.

Except that this one is made of wood, almost completely. The top and bottom chords, the diagonals. All wood. Except for those verticals, which are iron rods. Well, at least some are. Some look like wood. Bit hard to see. And that makes it a Howe truss.

Howe trusses were used for covered bridges, and later on for railroad bridges. In steel it’s a very strong design. In wood, it gets the job done as long as the job isn’t too big. Wood is pretty good under compression, but really weak under tension. So wrought iron was used for the verticals, because it excels under tension.

Actually, the thing is probably classified as a beam girder and pier supported culvert crossing. It’s almost too small to be an actual bridge, and you can see that the underpinnings are about 30 times heftier than the poles used to make the truss. 36” girders with railroad ties over them. So the upper is just for show. It’s a fancy railing.

Wasted bridal party acting totally sleazy? Never even saw ‘em.

LOL


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Posted by Drew458   United States  on 06/17/2013 at 06:33 PM   
Filed Under: • BridgesFun-Stuff •  
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