Simulate Early, Simulate Often... In Rhino
Deformation of a bridge subjected to gravity loading
The geometry was created in Rhino using a reference photo taken from the side. The pillar diameter and transverse pillar spacing were then used as scaling parameters.
The pillars were extruded to match up with the bottom surface of the rails and then combined together. The only loading is due to its own weight. High Strength concrete material was used (but no ribar was included)
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Comment
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Comment by Tomasz Wiatr on July 22, 2011 at 5:07am
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Hi,
"Exciting work and fun with this job is one company". I want to explain my intention.
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In the aspect of bridges I am not expert. In general I know that deflection on screen are not in scale - with this help we can show theese small movements of course! My fun (sorry if only for me) was probably bad with 1 missinformation. I have probably bad meaning that free ends of beams was sign of flexure (vertical) because two ends of beams (ribs) have maximum deep of colour but they are static (I see Your fine animation). By I see that we have in S&S many advanced COMPONENTS, and probably I don't understand all, yet. It should be another feature, not known for me.
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Second problem is column's work. In my oppinion deflection of columns is relatively big (in relation to deflection of beams) because deflection of beam in 1 (elastic) state is (in main part) proportional to stifness of E*A, not for E*I. Of course if column are deflected (bended) effect of compression id bigger. In elasticity theory it is II state and of course in this state deflection is bigger. But after serious "work in head" (without any fun) I think that this deflectioncan be related to small E*I at all, because columns are slim. My fun about soft clay or peat-bog (aspect of grounds mechanics) was related with this probable explanation (in form of joke, not professional in fact).
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Meybe this serious comment was better than my circuss :( I suppose that discussion forum (closed only for some people in this aspect) can be small forum/agora/arena, but meybe it was not ideal meaning. This is related with my job - i am "educator" too, it is defect I know, because "educator" is critic too... But it is not my main job/idea. I am fanatic of modeeling in widest sense. It is optimistic for us :)
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But I have another PROBLEM (serious and important for all World). It is cause of my e-mail too! What is it? This problem is serious: S&S and easy and friendly software and I have fear that people will be (in near future) "alleged master of FEA" and this can be dangerous for another people. I am not expert of FEE (I am learning myself yet) because I know that FE have "underwater reefs" and I hav respect for problem power. Of course not only meshing is problem (we have not here this problem) but boundary restrictions and other restrictions or restraints (based on theory of mechanics AND numeric methods too). Of course our small forum is today only forum of some explorers but cinema effects are visible for all, for amateurs too. We need cause caution/attention. It is main problem of my critics, it is like a safeguard on dangerous water. FE in the aspect of Structural Engineering is Cape Horn!
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Tom
engineer and sometime saylor
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P.S. I need to show someting own and all comments will be accepted :). I can prepere someting and You will be able to have fun with it :) (like a answer or justice :)). I think about "interesting case", meybe special case, with some specific restrictions (interesting case). I will be happy to give it under the discussion. All comments will be good. I will prepare some simplifications AND critics of me will be easy. I am working with education example with academic simplifications ;) specialy for You, Mr.Yi-Hsuan Lee!
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Comment by William Tiu on July 21, 2011 at 4:37pm -
Dear Mr. Wiatr
If you use FE packages you will know that they tend to exaggarate the deformation so that you can see it. If you were able to use a magnifying glass, you will find that the actual displacement shown in the video is very small. I am sure that you were trying to appear funny and clever at the same time. Of course you are a clever man but I would suggest that you hang on to your full time job and leave the 'comedy' to professional comedians.
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Hello,
Picture is fine, animation too, but staticaly it is not correct of course. It looks fine (like a rainbow on the sky :)) it is ready structure concept visualisation for Department of Transport :) or another Serious Authority :]. We need to advise replacement of ground (it is probably peat-bog under this fiveror plastic clay :)) because deflections are "essential/substantial", I suppose :) Attention, attention, bridge is under analysis :) Restricted area, only for...boats, specially armoured :). Good luck, simulation is exciting world, real virtual reality!
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Comment by Yi-Hsuan Lee on November 25, 2010 at 8:13am
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hi,
I just curious, did you add restranit in the connection of columns and beams?
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