Radius of arch - PRR stone arch bridges

[Tristan Ashcroft]

Does anyone know if the PRR had some standard radius for the curve of the arch on their stone arch bridges (or set of standards depending on span)?

Or does anyone have any suggestions on where to look for that sort of thing?

[Ed Kapuscinski]

https://www.phmc.pa.gov/Archives/Research-Online/Pages/PRR-Architectural-Drawings.aspx

Might be helpful.

[prr7161]

It's going to be pretty variable depending on span length, bridge height, and intended loading.  Here are a few examples illustrating the variety:

Pittsburgh Div. mainline over Loyalhanna Creek: https://live.staticflickr.com/7339/10017140514_107e77a570_b.jpg
Middle Div. mainline over Sherman's Creek: https://www.flickr.com/photos/99819826@N08/25747213796
Brilliant Branch over several roads (right side of photo): http://pghbridges.com/pittsburghE/0592-4479/brilliantlincoln3752pan.jpg

Your best bet is probably to work from photos of one you like or that fits the situation and try to replicate the construction details.

[John]

http://prr.railfan.net/standards/standards.cgi?plan=51224--

http://prr.railfan.net/standards/standards.cgi?plan=51225--

[Tristan Ashcroft]

Your best bet is probably to work from photos of one you like or that fits the situation and try to replicate the construction details.

Yeah, that certainly seems like the best way to figure those things out.

Thanks all.  I'll see what I come up with.