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 19:06:52 GMT
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Viewed:
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14757 times
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In lugnet.trains, Ted Michon wrote:
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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.
-Ted
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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 Engineering Mechanics:Statics book today and started looking at the
chapter on trusses again. Haven’t looked at that chapter in about 6 years. :-)
I’ve got a bunch of technic bricks, pins, and beams on the way from various
Bricklink stores. Once those arrive next week I am going to start again.
Thanks for the tip on triangle sizes. I’ll have to keep that in mind when
designing my new bridge.
-Dave
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Message is in Reply To:
 | | Re: Long Span Suspension Bridge?
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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, (...) (16 years ago, 24-Jan-08, to lugnet.trains, FTX)
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