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                                       Curved girder bridge
     
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1st message | this message only posted: 16 Mar 2016 22:32
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Please do not send requests for help direct to me via email or PM.

Post your questions on the forum where everyone can see them and add helpful replies.
Curved girder bridges are often needed by modellers, but quite rare on the prototype. Here's one for some details:


linked from: http://radioparadise.com

Martin.

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2nd message | this message only posted: 17 Mar 2016 13:21
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from:
Roger Henry
Brisbane, Australia

 

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     There is, or was, a curved, plate-girder bridge of fairly modern construction on the Western Australian Railways system. I have been trawling the net for a picture, but so far without success.

However, as usual, Google is our friend and Google images at https://www.google.com.au/search?q=curved+steel+girder+bridges&biw=914&bih=398&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiyjoj02MfLAhVEupQKHYmlBS0QsAQIGg

reveals a multitude of curved bridges, both road and rail,  in various formats. As always, there is a prototype for everything:-)

Roger

 

 

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from:
FraserSmith
Dundee, United Kingdom



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It may be a curved bridge but the plate girders are almost always straight and so easy to model. It is only comparatively recently with computer aided design and fabrication that it has become practical to make the beams themselves curved. Even then it's not really desirable as it generates significant torsion that is difficult for an I section beam to cope with. Much easier to give a bit of extra width between the beams to allow the curved track(s) to wander back and forth across the straight beams much like what happens with overhead catenaries on curves.

Fraser

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