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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Wed, 23 Jan 2008 22:58:36 GMT
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Viewed:
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14376 times
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In lugnet.trains, Ted Michon wrote:
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In lugnet.trains, Mike Gallagher wrote:
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,,
Total length 15ft (480 studs) , with one side of the deck over 12ft long.
The 12ft length is just to long for cable stay. The bridge is too light for
the use. But if I added weight to the bridge deck, say $30+ of pennies
across deck it stabilized it. And when the very light trains went over it
they did not bow any of the deck.
.. Mike Gallagher
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Mike-
The 192 stud (10 ft) cable-stayed bridged that I posted a picture of earlier
in this thread has a middle open span of 96 studs (5 ft). When we originally
designed it, we made the deck just 5 plates thick with the intention of
having the “cables” support the weight. We quickly determined that it was
easier to make the cables look cosmetically correct using bungee material (to
take up slack), but this proved impractical for supporting the thin deck. So
we added a truss under the deck so that even with twin heavy trains at random
locations we don’t get much deflection. Seems to work.
My next goal is a 384 stud (20 foot) suspension bridge with a 192 stud (10
foot) middle section using real cable. The biggest problem I see is anchoring
the ends (cable stayed bridges have their advantages!).
-Ted
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Ted,
Sorry, I can not stand it anymore. A 48 stud baseplate is 15” and a fraction.
Two at 96 studs would be 30” and a fraction. Four at 192 studs would be 5 feet
and a fraction. Therefore 384 studs would be ten feet 3/4 of an inch.
Bruce
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Message has 2 Replies:
 | | Re: Long Span Suspension Bridge?
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| (...) Aww, c'mon Bruce. All guys like to exaggerate the length of their LEGO bridges when telling others about them. Especially when talking with the ladies. ;-) Sorry Ted...Bruce kinda set me up for this one in a round-about way. :-) -Dave (16 years ago, 24-Jan-08, to lugnet.trains, FTX)
| | | Re: Long Span Suspension Bridge?
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| (...) Bruce- You are quite right, but my error is in studs, not feet. (I had an in-the-back-of-my-mi...uite-right feeling even as I wrote the post(s). I think the problem was that I knew that each single tower section was 192 studs long but in the (...) (16 years ago, 24-Jan-08, to lugnet.trains, FTX)
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Message is in Reply To:
| | Re: Long Span Suspension Bridge?
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| (...) Mike- The 192 stud (10 ft) cable-stayed bridged that I posted a picture of earlier in this thread has a middle open span of 96 studs (5 ft). When we originally designed it, we made the deck just 5 plates thick with the intention of having the (...) (16 years ago, 23-Jan-08, to lugnet.trains, FTX)
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