Subject:
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Re: My newest creation, Hell Gate Bridge NY
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 8 Dec 2000 10:29:31 GMT
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Viewed:
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1014 times
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In lugnet.trains, James Trobaugh writes:
> Looks like the arch is made from 4.5v curved rails, right Arne? I really
> like the look of it, very sturdy and even looking. Nice job.
>
> I'd have to argue with the "two" arch bridges though, I have a technic arch
> bridge that I made earlier this year.
>
> http://www.ngltc.org/GRNBRG2000/image6.htm
> http://www.ngltc.org/gats2k/image19.htm
>
> It not a steep arch, but an arch just the same :)
Well, no, I'd have to categorise it as a type of through truss.
Hell Gate and Sydney Harbor Bridge, for example, are suspension arch
bridges. Essentially all members below the arch are in tension and the deck
is suspended from the arch. (The arch itself is usually either done as a
truss, with some members in tension and some in compression, or as an all
compression solid or fabricated structure)
Steve's bridge, and the Rainbow Bridge at Niagara Falls, for example, are
cantilever arches... Essentially all the members of a cantilever arch are in
compression, with the deck carried above the arch.
Trusses are characterised by a mixture of compression and tension members.
Unless all the members below the arc of the top chord are in tension,
(including the deck stringers) it's a truss, not an arch. I believe.
I posted a link to a site that gave good bridge information in this group
some time in the past, but I'm too lazy to dig it up again.
A key point here, though, is that the model that started this discussion is
very very nifty.
++Lar
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Message has 1 Reply:
 | | Re: My newest creation, Hell Gate Bridge NY
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| (...) I was going to leave this, but now that you started... I agree that is not a arch, and I expect that is was modelled on a truss. However, I'd call it a frame as it is pin jointed (trusses, I think are not). However, to be a frame all the (...) (24 years ago, 8-Dec-00, to lugnet.trains)
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Message is in Reply To:
| | Re: My newest creation, Hell Gate Bridge NY
|
| Looks like the arch is made from 4.5v curved rails, right Arne? I really like the look of it, very sturdy and even looking. Nice job. I'd have to argue with the "two" arch bridges though, I have a technic arch bridge that I made earlier this year. (...) (24 years ago, 8-Dec-00, to lugnet.trains)
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