Prestressed Beam Competition
WaterEngineer
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Some of you know I guest lecture at UNF, occasionally. One of the student from a class I lecture sent me the video at the link. I thought you fellers would like it.
It shows the beam design the students came up with for the 2014 prestressed beam competition. Ya, I know us civil engineers are exciting folks. The video also shows some of the big lab toys we get to play with.
Anyway, the basic parameters of the event are the beam has to weigh less than x pounds per foot and the competition is to see which beam can carry the most. Basically the competition is about: concrete design, design of the beam cross-section and steel placement within the beam.
In the video - the concrete beam deflects over 4-inches before ultimate failure - impressive for such a short beam. In the video is the term "kips." A "kip" is one thousand pounds.
Enjoy the 3-minute show. >> https://docs.google.com/file/d/0B0ze7rGsxySsR1ZiRGpudW03dEk/edit
Edit: Oh, and if you have young one, please show them the video, to show how that boring science and math class are applied in the real world. Thanks.
It shows the beam design the students came up with for the 2014 prestressed beam competition. Ya, I know us civil engineers are exciting folks. The video also shows some of the big lab toys we get to play with.
Anyway, the basic parameters of the event are the beam has to weigh less than x pounds per foot and the competition is to see which beam can carry the most. Basically the competition is about: concrete design, design of the beam cross-section and steel placement within the beam.
In the video - the concrete beam deflects over 4-inches before ultimate failure - impressive for such a short beam. In the video is the term "kips." A "kip" is one thousand pounds.
Enjoy the 3-minute show. >> https://docs.google.com/file/d/0B0ze7rGsxySsR1ZiRGpudW03dEk/edit
Edit: Oh, and if you have young one, please show them the video, to show how that boring science and math class are applied in the real world. Thanks.
Replies
"The greatest pleasure is to vanquish your enemies and chase them before you, to rob them of their wealth and see those dear to them bathed in tears, to ride their horses and clasp to your bosom their wives and daughters."
How does that compare to precast beams with tension cables?
That is basically what this is. There is post tensioned and prestressed. This specimen is prestressed.
You will see post tensioned on Bridges and concrete slabs (floating slabs.)
Does that answer your question?
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Some bridges are made just like a floating slab - the tendons are strung thought conduits then post tensioned - generally very long spans - like the Skyway for example. The beam in the video has more application for single bent (single span) highway bridges and tip-up concrete buildings. A pre-cast tip-up parking garage would be an excellent example.
Here is a video of post tensioning a bridge. >>> https://www.youtube.com/watch?v=QDRWgvgcOG0
Each of the Lego blocks in the construction of this bridge are post tensioned to the one behind it. >> https://www.youtube.com/watch?v=67lUKKlj2pY
Here is a video of how a prestressed beam works - like the one in the video of the OP. >>> https://www.youtube.com/watch?v=pjwrXLWhISE
A southeast Florida laid back beach bum and volunteer bikini assessor who lives on island time.
i was the project surveyor for several post tension bridges designed by figg & muller engineers based in tallahassee...
the design of these bridges is very unique and lends itself to creative shapes that are beautiful structures...
i was also the assembly tech that had to put the segments together up in the air...
very challenging work as well as interesting....
figg & muller became figg engineering group.....
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if you can't catch a fish...catch a buzz....
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Post tension can be slabs and beams. We build buildings all over with PT slabs.
Tilt up is usually rebar only within the walls.
I am only speaking for ht construction industry in my local area.
Im not an engineer but I am a GC that specialize in shell construction.