Subject:
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Re: Truss Joint Construction Details
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 14 Mar 2002 20:41:52 GMT
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Viewed:
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819 times
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In lugnet.technic, Jan-Tore Skålvik writes:
> http://www.brickshelf.com/cgi-bin/gallery.cgi?f=13558¨¨
>
> check this out!
> I think this might help you alittlebit!
> regards
> jt
Thanks JT!
You can make things a little easier by not connecting all the member ends at
one common point (like you did with the diagonal connection). Also, take a
look at Ross' truss bridge:
http://www.lugnet.com/~469/projects/archbr
The joints don't meet at a common point, or rather, you don't have perfect
triangles. This weakens the structure as you now have a lot of bending
moment in your members. However, considering Lego applications, this
construction is relatively strong and should be adequate.
For simple truss designs, where the top and bottom chords are parallel,
construction is fairly simple:
http://www.texbrick.com/ideas/truss/truss_ideas.html
My white bridge has joints where up to 5 different members at different
angles are joined together. This makes for a very difficult joint.
One other note about "non-common center" joints, it makes any sort of
calculation more difficult. For my white bridge, I calculated the geometry
(and sized the members) prior to construction. The calculation was simple
because the whole thing was just a series of triangles. If you're going to
work with 4-sided elements, then it's a little more complicated.
TJ
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Message has 2 Replies:
 | | Re: Truss Joint Construction Details
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| That was just an idea that struck my head, I dont have any plans to build a brigde, but I want to build a crane someday... "Thomas Avery" <thomas.avery@intec-hou.com> wrote in message news:GszDHs.JyM@lugnet.com... (...) at (...) (23 years ago, 14-Mar-02, to lugnet.technic)
| | | Re: Truss Joint Construction Details
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| (...) Indeed. I did it slightly differently (but same basic idea for my harbour bridge (URL) This was forced on me by the weight of the arch - not having the symmetric main beams would've damaged the connection axles, or the holes they went through. (...) (23 years ago, 14-Mar-02, to lugnet.technic)
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