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Stacy and I are designing a small layout for Brickworld this year and we want/need to have a bridge in the layout. We've been working to design the layout using banquet tables (so I don't have to bring my own tables), yet we still want an open space (...) (17 years ago, 22-Jan-08, to lugnet.trains, lugnet.town)
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| | Re: Long Span Suspension Bridge?
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"Dave Sterling smsrallysport.com>" <dave@ <spamsucks> wrote in message news:Jv2A1L.BAr@lugnet.com... (...) If you use a tensioned string support system underneath, you can go long distances with few parts. -Rob (17 years ago, 22-Jan-08, to lugnet.trains)
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| | Re: Long Span Suspension Bridge?
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(...) How about some anecdotal pictures? This cable stayed bridge spans 192 studs and this arched truss bridge spans 288: (URL) This over truss bridge spans 192 studs: (URL) This under truss spans 192 studs and passed the 16 pound bowling ball in (...) (17 years ago, 22-Jan-08, to lugnet.trains, FTX)
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| | Re: Long Span Suspension Bridge?
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(...) Ted, Once again, you come through in spades! You always seem to have the answers I'm looking for. Do you have a Brickshelf folder or image gallery on the web where I can find a bunch of close-up pictures of your truss bridges? I want to get a (...) (17 years ago, 22-Jan-08, to lugnet.trains, FTX)
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| | Re: Long Span Suspension Bridge?
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(...) Dave- All our public images are posted on the (URL) SCLTC website>. This (URL) will take you to every photo that contains a bridge. Just click on the ones that interest you for a larger image. I'll gather some photos of the newest bridge and (...) (17 years ago, 22-Jan-08, to lugnet.trains, FTX)
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| | Re: Long Span Suspension Bridge?
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(...) I built one a couple of years ago that spans 128 studs, with two tracks. It's pretty minimal. I used double 1x16 technic bricks to support the deck, then combinations of technic bricks for the trusses. The deck is just strips of 2x16 plates (...) (17 years ago, 22-Jan-08, to lugnet.trains, FTX)
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| | Re: Long Span Suspension Bridge?
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(...) Here's a 288 stud bridge Bob Kojima built: (URL) next to see a few more pictures. Frank (17 years ago, 22-Jan-08, to lugnet.trains)
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(...) Well after reading your post one last time before I sent this I realized you wanted info on truss designs for a suspension bridge (like the Golden Gate) not a cable stay. But the second post threw me off due to the same problem I have had that (...) (17 years ago, 23-Jan-08, to lugnet.trains, FTX)
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| | Re: Long Span Suspension Bridge?
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(...) Dave, I built a 128-stud, truss style bridge for NGLTC shows that's become a staple of the layout. I use ZNAP as structural "members" to go over the tracks. The bridge does not use any support other than the compression between two tables. (...) (17 years ago, 23-Jan-08, to lugnet.trains)
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| | 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 (...) (17 years ago, 23-Jan-08, to lugnet.trains, FTX)
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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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| | Re: Long Span Suspension Bridge?
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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 (17 years ago, 23-Jan-08, to lugnet.trains, FTX)
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| | Re: Long Span Suspension Bridge?
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(...) Sorry wrong math the bridge were A 10ft (12 32x32 Baseplates) (384 studs) B 15 ft (18 32x32 Baseplates) (576 studs) Also forgot link to current bridge (URL) mike (17 years ago, 24-Jan-08, to lugnet.trains, FTX)
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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 (17 years ago, 24-Jan-08, to lugnet.trains, FTX)
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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 (...) (17 years ago, 24-Jan-08, to lugnet.trains, FTX)
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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, (...) (17 years ago, 24-Jan-08, to lugnet.trains, FTX)
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| | 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)
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| | Re: Long Span Suspension Bridge?
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(...) (URL) This bridge> had a main span of 96 studs, and could have been more if I had more room on the end to attach the main cables further from the base of the tower. It could also be doubled in length by building the same from the other end. (...) (17 years ago, 24-Jan-08, to lugnet.trains, FTX)
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| | Re: Long Span Suspension Bridge?
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I've found the deck can be pretty insubstantial; even in minifig scale, the truss carries the weight. The Notre Dame Bridge is about 320 studs long and has been up for over a year now: (URL) At least, I have heard no news of its collapse. It can (...) (17 years ago, 24-Jan-08, to lugnet.trains, FTX)
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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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| | Re: Long Span Suspension Bridge?
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(...) How much clearance should I have track to (...) At work they like to quote the statement "Standards are great. That's why we have so many of them." Standard height is whatever you and whomever you interoperate with agree on. At SCLTC, standard (...) (17 years ago, 27-Jan-08, to lugnet.trains, FTX)
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