Wrought Iron

Unfortunately Altered

The last of our Boston trip… That picturesque little bridge is in the Public Garden. As far as I can tell it doesn’t have a name, which is fitting, since it is described in some places as the “world’s shortest suspension bridge.” I don’t know if there are any shorter suspension bridges or how to …

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Detailing, 160 Years Ago

That is the Hamden Bridge over the Raritan River in southish, western New Jersey. It was built in 1858 and is, unfortunately, gone since 1978. By modern standards it was quite small and to our eyes looks almost cute, but it represented a turning point in structural engineering in the US. Rational analysis of trusses …

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The Nevius Street Bridge – Member Design

See here for part 1 of this dive into archaic bridge design. In a pure truss, all of the members are loaded only in axial tension or axial compression. No bridge is composed only of pure trusses – the deck beams that support the roadbed from the side trusses are loaded in bending – but …

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Interesting Because It Is Ordinary

Today’s post and a few more to follow are going to focus on the Nevius Street Bridge in Raritan, New Jersey. It’s simultaneously historic and interesting, and utterly common and boring. It was built in 1886 during an era when thousands of similar truss bridges were constructed across the United States. There is nothing in …

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Follow-up on Economics and Metal Fabrication

Bill Harvey sent me this close-up after our sight-seeing trip to the Clifton Bridge.* Putting aside the beauty of the photo in itself, it has something to say about changes in metal (in this case wrought iron) technology over the years. That’s a connection between two parts of an iron tie in the vaults at …

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