Subject:
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Re: Large arch bridge geometry - help!
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 4 Jul 2002 21:02:05 GMT
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Viewed:
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485 times
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In lugnet.technic, Ross Crawford writes:
> In lugnet.loc.pt, Pedro Silva writes:
> > Hi all,
> >
> > I am attempting to design a large ached bridge with technic parts, and this
> > means I'll need plenty of reading on the subject of beam-geometry. Can any
> > of you guys help me out in my research?
> > The thing that is giving me the biggest headache so far is the relation
> > between angles possible with LEGO beams, the only sure stuff I know is the
> > famous 3-4-5 triangle and that is not much help for this :-(
> > My ultimate purpose is to design in LEGO something that ressembles either
> > one of the two mettalic bridges in the following link:
>
> Pedro,
>
> I found it easier to think in terms of beam length, rather than angles. If
> you have a good profile view of the bridge, one way is to overlay it with
> graph paper (or just use a ruler) to measure the beam lengths, then match
> them as closely as you can with LEGO. This will probably require some trial
> & error to get it looking right.
I'll try this method now - it seems easy enough. The reason I had not tried
it before was because I wanted to find a more "general" fashion to design the
arch, and then apply to my planned bridge. It is better in theory, but
failed in practice :-/
> The hardest part is getting the truss structure as thin as possible. One of
> the best resources for that is TJ Avery's http://www.texbrick.com/ - look
> under his ideas section.
TJ's page is great, and I am still checking the link (it has plenty of
information, which I must digest slowly). Looking good so far, and it even
gave me a new idea for the bridge's "accesses" (the viaducts on either side
of the main bridge?)
> You might also want to check out my bridge
> http://www.brickshelf.com/cgi-bin/gallery.cgi?f=3057 8?) but there's not
> much technical info there 8?(
:-)
I know your bridge. She is *the* bridge to which all others bow, mate!
Thank you for the tips!
Pedro
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Message is in Reply To:
 | | Re: Large arch bridge geometry - help!
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| (...) Pedro, I found it easier to think in terms of beam length, rather than angles. If you have a good profile view of the bridge, one way is to overlay it with graph paper (or just use a ruler) to measure the beam lengths, then match them as (...) (22 years ago, 4-Jul-02, to lugnet.technic)
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