i wish we would have this in our class. its a great way of learning about structures. prof. deb is fantastic in teaching Structural Theory, I wish we have her on our School. lol. I am dealing with Maxwell's Diagram for our Three-Hinged Arch design, i couldn't get past through with the closed polygon, i am yet to move trusses to make sure it encloses the whole structure. :(:S
The test is inconsistent due to the shaker being bias and subjective!!!! Well of course all structures will break if you keep increasing the motions and the strength of the shake... in order words ... cheating.
You miss the point...the whole objective *IS* to break them. The question is *HOW* did they fail. If they can't be broken then nothing is learned. Testing to failure is a basic means of learning how to design successful structures.
the most unshakable structure is one that moves and avoids danger instead of resisting it, that's why all buildings of the future will be on wheels or be suspended by magnets in the air.
You’re not too far wrong there! Seismic base isolation is a very effective technique gaining in popularity . en.m.wikipedia.org/wiki/Seismic_base_isolation
@professordeb but how do you build flexibility (to dissipate shear forces) into pasta and hot glue? The only thing I can think of us a collar and sleeve support beam (a column of 4 or five noodles glued together, sleeved over by a hollow column of noodles providing a gap). But even then how you would connect this to the base (where most of the failures occured) would still most likely cause failure. This will be due mostly because of the material. Idk
No the tower does not need to be straight, however because of the need for base and top attachments, there is a requirement that it be 8" square (~20cm) at the top and bottom.
The frame is made from 2x4s with a plywood base. Inside of this is a small frame made of 1x2s that are supported on "flanged ball transfer units" like this that I got from Grainger: www.grainger.com/category/material-handling-conveyors-ball-transfer-units/ecatalog/N-10yp/Ntt-ball+transfer?sst=subset&ts_optout=true So these are the roller balls that the table top glides on. The smaller inside frame is attached to the larger outside frame with small springs. The actual table top is a sheet of masonite hardboard that is centered on some pegs installed on the inner frame. Outside bearings of the same type used on the inside are necessary to counter the overturning-induced tension that will lift off the hardboard top if it's not held down. I'm still searching for a good way to anchor the pasta to the table itself. That's the hardest part!
This was instructive and illustrative, but if this was a competition as it appears, then it was fundamentally flawed. Should have had a computer-driven shaker, that consistently started at a low level displacement that gradually increased in displacement and velocity. As an Engineer, I would have been both frustrated and highly displeased by the semi-random methodology of this 'test'. A most definitely poorly designed and controlled 'competition', unfair at it's core. Engineers take this stuff seriously!
![CONCURSO SPAGHETTI BRIDGE 2019 en UAH - Concurso Puente de Espaguetis [Real Poly Bridge 😀]](http://i.ytimg.com/vi/SIqtGDYTJSA/mqdefault.jpg)
Great job. I appreciate the ideas shown here and will use them in my MS science class here in Las Vegas when we cover this. Go Rebels!
i wish we would have this in our class. its a great way of learning about structures. prof. deb is fantastic in teaching Structural Theory, I wish we have her on our School. lol. I am dealing with Maxwell's Diagram for our Three-Hinged Arch design, i couldn't get past through with the closed polygon, i am yet to move trusses to make sure it encloses the whole structure. :(:S
What did you use as glue material
They use hot melt glue for this
The test is inconsistent due to the shaker being bias and subjective!!!! Well of course all structures will break if you keep increasing the motions and the strength of the shake... in order words ... cheating.
You miss the point...the whole objective *IS* to break them. The question is *HOW* did they fail. If they can't be broken then nothing is learned. Testing to failure is a basic means of learning how to design successful structures.
the most unshakable structure is one that moves and avoids danger instead of resisting it, that's why all buildings of the future will be on wheels or be suspended by magnets in the air.
You’re not too far wrong there! Seismic base isolation is a very effective technique gaining in popularity . en.m.wikipedia.org/wiki/Seismic_base_isolation
@professordeb but how do you build flexibility (to dissipate shear forces) into pasta and hot glue? The only thing I can think of us a collar and sleeve support beam (a column of 4 or five noodles glued together, sleeved over by a hollow column of noodles providing a gap). But even then how you would connect this to the base (where most of the failures occured) would still most likely cause failure. This will be due mostly because of the material. Idk
Does tower have to be straight up? Or no one just smart enough to make wider base?
No the tower does not need to be straight, however because of the need for base and top attachments, there is a requirement that it be 8" square (~20cm) at the top and bottom.
Great got some great ideas for mine in class thank you
Glad it helps! It's a fun project.
2:20 Resonant frequency
How can you make the shake table
The frame is made from 2x4s with a plywood base. Inside of this is a small frame made of 1x2s that are supported on "flanged ball transfer units" like this that I got from Grainger: www.grainger.com/category/material-handling-conveyors-ball-transfer-units/ecatalog/N-10yp/Ntt-ball+transfer?sst=subset&ts_optout=true
So these are the roller balls that the table top glides on. The smaller inside frame is attached to the larger outside frame with small springs. The actual table top is a sheet of masonite hardboard that is centered on some pegs installed on the inner frame. Outside bearings of the same type used on the inside are necessary to counter the overturning-induced tension that will lift off the hardboard top if it's not held down.
I'm still searching for a good way to anchor the pasta to the table itself. That's the hardest part!
Nice video
This was instructive and illustrative, but if this was a competition as it appears, then it was fundamentally flawed. Should have had a computer-driven shaker, that consistently started at a low level displacement that gradually increased in displacement and velocity. As an Engineer, I would have been both frustrated and highly displeased by the semi-random methodology of this 'test'. A most definitely poorly designed and controlled 'competition', unfair at it's core. Engineers take this stuff seriously!
They all fell anyway because of base
That’s usually the weakest part, even though I warn students over and over! 😂
Damn not bad
Binod
Wow, this looks like so much fun, really keen to try it. Do you have any advice on rules for the competition and how to run it.