Subject:
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Re: Bridge Study the 13th
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Newsgroups:
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lugnet.build
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Date:
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Tue, 14 Oct 2003 13:57:08 GMT
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Viewed:
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438 times
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In lugnet.build, Thomas Avery wrote:
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In lugnet.build, Adrian Egli wrote:
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October 13th, 2003 and here is Study 13.
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=27783
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Most excellent. As a structural engineer (who plays with LEGO parts very
often), I can appreciate the complexity of a curved bridge deck. There are
many here in Houston (road bridges) and it’s impressive to see them. Of course
they are plate girder construction, but the girders are curved as well! (as
opposed to a segmented construction with straight girders between supports).
The overall appearance of the study is quite nice, as well as your previous
studies. Nice work.
-TJ
www.texbrick.com
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Thanks for the complements :)
Creating that deck involved a lot of number crunching (a graphing calc w/ table
function is very helpful!). It was finding the “right” radius values that was
the tricky part. When the idea of doing this came to me a few months ago I
thought my starting point would be an inner radius of no less than 160 studs. I
ended up using 256 for my inner and 280 for my outer. The arc itself only
travels 60 degrees (30 left/30 right) but the arc’s length at r=268 is approx.
280 studs. To pull off that same distance with train track (using r=40) and you
need to travel 402 degrees (a full circle and then some).
What’s holding all those bricks together is a core made up of lots of 8x8 and
8x16 bricks, three bricks thick, to form a “skeleton”. Light gray bricks and
tiles keep them out of view.
An even bigger version (bigger radius) is one of those 2005 projects. A curved
bridge I really love to build is the Sunniberg bridge in Klosters, CH.
Specs in English but photos are so-so:
http://www.structurae.de/en/structures/data/str00072.php
German text but better photos:
http://www.bp-ing.ch/b_sunniberg.htm
Adr.
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Message is in Reply To:
 | | Re: Bridge Study the 13th
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| (...) I can appreciate the complexity of a curved bridge deck. There are many here in Houston (road bridges) and it's impressive to see them. Of course they are plate girder construction, but the girders are curved as well! (as opposed to a (...) (21 years ago, 13-Oct-03, to lugnet.build)
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