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 00:49:05 GMT
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Viewed:
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1759 times
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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.
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.
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?(
ROSCO
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Message has 1 Reply:
 | | Re: Large arch bridge geometry - help!
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| (...) 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 (...) (24 years ago, 4-Jul-02, to lugnet.technic)
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Message is in Reply To:
| | Large arch bridge geometry - help!
|
| 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 (...) (24 years ago, 4-Jul-02, to lugnet.technic, lugnet.loc.pt)
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