Subject:
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Re: Long Span Suspension Bridge?
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Newsgroups:
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lugnet.trains
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Date:
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Thu, 24 Jan 2008 16:52:28 GMT
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Viewed:
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15927 times
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In lugnet.trains, Dave Sterling wrote:
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..
Any thoughts on what I have so far? I’d really like to try one of those cool
cable-stayed bridges sometime, but I’ll need to get a closer look at how the
cables are held in place.
..
-Dave
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Dave-
If you want your truss construction to actually support the bridge, you should
convert your trapezoids into triangles (i.e., break them up by adding verticals
in the middle). (Actually, the way many of us do this still makes trapezoids,
but one of the horizontal sections is so small that it’s effectively a
triangle.) The best way to make the triangles is to use length ratios 3:4:5 or
5:12:13 so they come out exactly in studs.
With regard to the “cable” in our cable stayed bridges, we just used bungee cord
(from Jo Ann Fabrics, which appears to be identical to the stuff that came with
LEGO Bungee Blasters a few years ago). In the towers, we just run through the
holes in Technic plates. At the deck, we run it through a piece of stiff LEGO
tubing, then a 1x1 cone, then a small Technic connector from the cone to an axle
hole, and wedge between the axle and axle hole and into the deck through a hole
in the side of a Technic brick.
-Ted
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Message has 2 Replies:
 | | Re: Long Span Suspension Bridge?
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| (...) Yeah, after I built this I realized that I had the technic pins at the top too far apart and should move them each in slightly to form a triangle. Right now the track and track bed are supporting most of the load I think. I pulled out my old (...) (17 years ago, 24-Jan-08, to lugnet.trains, FTX)
| | | Re: Long Span Suspension Bridge?
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| (...) Ted: Here's V2.0 of my 92-stud bridge. I added the vertical bracing and it made a HUGE difference in both the stability of the deck and the lateral stability of the actual truss structure. (2 URLs) More Pictures> Now I just have to wait for my (...) (17 years ago, 25-Jan-08, to lugnet.trains, FTX)
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Message is in Reply To:
| | Re: Long Span Suspension Bridge?
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| (...) Wow! This has all been great information and the pictures are wonderful. I'm really excited to get a closer look at some of these bridges at various shows this summer. :-) I might even have to get out to somewhere where SCLTC is displaying (...) (17 years ago, 23-Jan-08, to lugnet.trains, FTX)
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