Record Truss Bridge 2012 - University of Auckland Engineering
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- เผยแพร่เมื่อ 26 ก.ย. 2024
- This truss bridge is the current record holder at the University of Auckland's Faculty of Engineering. It supported 1087N before an additional 96N caused failure.
If you are interested in studying engineering in New Zealand at the University of Auckland, follow this link - www.engineering...
![CONCURSO SPAGHETTI BRIDGE 2019 en UAH - Concurso Puente de Espaguetis [Real Poly Bridge 😀]](http://i.ytimg.com/vi/SIqtGDYTJSA/mqdefault.jpg)
Insane holding that much weight during a earthquake!
Anthony Cabrera underrated comment
These are so frágile on earthquakes... If edges separate enough do to an oscillatory quake the bridge wont broke. Just fall complete. It always happens... Axes mst be really long to allow movement of given buildings
Lmao
Are you Referring to the cameraman?
LOL
The bridge was more stable than the cameraman.
ikr,the camera man is trash
I think the camera man was going through a withdrawal of some sort😂😂 the way he was breathing and shaking 😂
omg ur on point haha,by d way care to aub guys i would be nice ty😅
👍
OH SNAP!... sound of sonic boom cause I said it so loud
I entered this contest when I was in college, it is a great challenge for engineering students to get off the CAD software and actually build something and test it. We weren't allowed any metal pins though, only popsicle sticks and white glue, anything else used was a disqualifier. I still have mine hanging in my garage as inspiration. This group did a great job.
:)
They did outstanding…they better have gotten an A on this one 😁
how did it perform in the test?
@@cabletie69 if memory serves, we held about 2000lbs of downward force on the centre beam. Designed a gull wing truss like this...'IAI'...It nestled tight below and between the outer supports, and transferred the forces directly to the rig itself keeping the majority of the structure in compression rather than tension. We also pinned each connection with toothpick sized pins to strengthen the load bearing joints and dovetailed each length of popsicle stick so that they didnt slip where they butted against each other.
@@johnnybgoodbeesandbarbecue5788 impressive result! Nearly one metric ton.
I would replace the loading technique with pouring sand into a container to get a more exact failure weight
Also it will increase the weight gradually
You boys would be in charge of cleaning up then
Yer right! And would it be more accurate if the load was put on top(not bottom) of the bridge?
@@fultontracymendoza6149 the bridge is designed around the idea of the load being applied like this though..
Do you realise how much 120+ kg of sand is though? Just not practical
This is the type of stuff that prooves if you actually learned stuff and were not just there to fill seats
Not exactly. Its a group work & inside the group there are always teammates who just fill seats.
@@yureino SHADE HHHAAHAHAHAHA
Haha 🤣
@@yureino If you're lucky, those bench warmers will offer to pay money. But most cases they do nothing and still expect to get credit for the group work.
@@yureino nah it’s uni not high school. In univ- at least in my uni everyone participated .
Why do they always find the weakest link to operate the camera?
Most likely one of the profs. So chances are pretty good they know a whole lot more than you.
LOL you call this acceptable camera work for a record attempt, wow you have very low standards. If it is a prof then it looks like he's suffering from detox shakes, give the poor guy a drink.
well what other job do you suggest he do?
he's a damn engineering prof not a film maker
This was recorded at a University, I doubt they're going to bring in a professional to record a wooden bridge :l
I remember building a balsa wood bridge in secondary school.
I love engineering and two others in my group did as well. We designed a bridge that worked so well using designs that were really cleaver and fantastic.
In the end we ran out of bricks to put on the bridge, so we got the teacher to stand on it. Our bridge still sits proudly on the wall of records.
We set the record of 140KGs.
In my high school physics class in 1975, two students took their quota of balsa splints and laminated two beams. It was better by many orders of magnitude. They illustrated why we don't build truss bridges and captured the essence of composite construction which was taking off at the time. The dinosaur teacher disqualified them as "not in the spirit of the contest".
@@iverburl Right?
_"You're here to learn to be the next generation of innovators"_
*_"Oh, you innovated too much."_*
The camera man was still high from all the adhesives used in this project.
It was plain white (PVA) glue like used in elementary school. No fumes or harsh solvents. You can eat it without ill effects. Safe for children.
can we all just appreciate that 50 or less Popsicle sticks held up over 280lbs of weight..???
yes, because thats what this video is
What kg 280lbs is?
@@okiriotaa4664 around 120 kg
ur saying 50 or less popsicle sticks can hold two of me?
@@Starnoch yeah
Never have i been so happy or seen anyone so happy to see their project break....after all, it's a truss bridge, and we all are eagerly waiting for it to break at some point😃🙌🙌
Hopefully this engineering student has found relief from his constant seizures!
I remember doing this same project in my 7th grade industrial science elective class, very fun assignment. A couple of the teachers had an on-going fun feud to see which of theirs could outperform the other and awarded the students with extra points for getting the highest load or breaking a record. Learning can be a lot of fun! 😁
You could select your 7th grade class?
The crazy thing is that the actually bridge part didn’t fail the sticks failed
That's what's going to be the source of failure no matter what, it's just about designing it to distribute weight across all of the sticks.
@William Lyon I think they mean the parts where the sticks connected, whereas the breaking point was actually in the middle of the popsicle sticks instead.
@Neal Head pressure will almost never be evenly distributed across a bridge
??? the sticks are the bridge, it's like saying an actual bridge didn't fail because only the cable snapped
What will melt your brain more than this is they had stacked the weight on top of the bridge it would have had a different breaking point, in terms of weight. It may have been less or it may have been more but having it distributed differently would have changed the physics.
If only they could also build a stable camera stand.
If only people realize that not everything is a proper video shoot.
@@PrincipalCowbellist doesnt need to be to hold a camera steady
cheers mate. it was 2012 (or maybe older)
Shake demonstrated that it’s earthquake
Probably not a good idea to be filming after a heavy night of drinking. The shakes can be a terrible thing.
Since 90% of these comments are disrespectful ill drop in to say good job breaking the record there that was impressive
76.4% you fucking idiot.
what record m8 ?
Anthony Cannon tried to resign and get my own team and also develop more but you know how engineering goes people don't want to see you on the top so they it do their thing
SOLUTION ONE disrespectful reply
@@Loachie90 You must be big into humour Micheal?
Fine, I'll watch it, TH-cam.
Simon Well, at least I know now how to count to three on a university level.
FINE
Simon lol
Honestly
Same reason i watched it haha
6:04 "that's 19 and 8... Soooo 26" Im not going over any Bridges in new Zealand from now on
Raphael Thorp He bad at math
So they actually beat the record by 7...
Lol, I noticed that too and decided to check the comments first before I commented 😂
Lost that little casio calculator. LOL.
19 + 8 sooo 26 with 1 as a safety margin for people who don't read safety limits for my NZ bridge - I feel safe here in NZ
I’m probably the only one here that searched for this video.
Tell me your story
I'm with GARLIC BREAD PROVIDER
@@levihuerta9393 I’m in a Poe class, and we were instructed to create a bridge from 1/16 inch wooden sticks. I searched up videos for ideas on what kind of bridge to make, and this unique design caught my eye.
yes
Damn was gonna say that but you stole it. Wanted to see what kind of bridges are the strongest in the world and I somehow stumbled upon this and it caught my eye and honestly glad I watched it.
I remember doing this in high school metal shop. The difference though was you had to make this out of 2 meters of oxy-acetylene welding wire and weld each joint. So it was a test of your design and welding skills. Pretty proud to say I held the record for at least the 4 years I was in school.
My similar thing was to make a foundation using 4 index cards and 2 inches of scotch tape. I remember my group not wanting to take my idea so I went and freelanced it and had the best solution. Held every text book in the classroom. Its really an easy solution if youre even just a little bit mechanically or structurally inclined.
Geez Zuss.... can the cameraman take some classes there???
Frustrating. Cameta did not focus on the truss and the weight.
the cameraman suffera from autism dude.. we should respect that!!
At least it’s horizontal
Well it ain't a film class
waxandwane iiiiiii
I did this exact same design project in the 1st semester of 2018 at UoA and thought I would clear up some common queries in the comments. First-year students are given 3 weeks and a limited number of popsicle sticks to create the structure. There is also a tonne of ridiculous spatial requirements between the two resting points which largely dictate the unsymmetrical shape of the structure. These shapes and joints could theoretically hold a lot more weight as the limiting factor is the grain of the popsicle sticks, almost all examples break transversely to the grain at the loading point. You may notice that this structure has almost excessive cross-bracing on its top to withstand the largely imperfect loading method. Structures without sufficient crossbracing fail almost instantly (like,
Necro post. =) That is Ok, if you asked me. It held 1087N @146g ~750:1. Caveat, maybe they were forced to use the bolts as junctions compared to most other engineering competitions? Did you have to do that? Did not even hit 800:1, let alone 1200:1 for same competition held elsewhere in world(usually with longer span). The next caveat is the 10g of glue limit as most other bridge competitions usually meter out the glue based on volume instead of weight as they use "white" water based glue instead of PVA(rather odd)so I do not know how this converts to other competitions(the one I did and thousands of others around the world) and they might have chosen this to PURPOSEFULLY differentiate this competition due to the age of the internet and ability to download files from other people and same goes for your stated misalignment of the footings which does not make a difference to anyone who knows how to build anything, but to someone who is lazy and tries slapping something together at last minute... yup. Also, the span used in this competition is shorter than normal which significantly helps increase the load numbers and strength to weight ratios.
Always a good engineering competition. The ball bridge drop test catch engineering challenge is even better along with the earthquake building challenge.
PS: No "I" beams built out of the popsicles makes this a poorly designed bridge as a competition example. Stopping the transverse grain splitting on the popsicle sticks is easy with a little glue and a shred of cross bracing against the grain direction.
Wow. They added almost 111kg (244lbs) to the bridge before breaking. That's insane
Yeah, that's just insane. I'd not trust a 3cm thick and 15cm wide plank to hold that weight!
That means that I could stand on it and have 90ish pounds of leeway before it broke
Dam that about double my weight though i do not trust that it would hold me because of mass and the slight movement and vibrations our bodies give off
@@shrimp3486 yep a nail hanging off a wall could hold a car.
But applying any moment on the car would cause that nail to break off.
People underestimate, how strong every day objects are
@@2DReanimation Over that span it would hold that easily
Jesus Christ I am a bridge Engineer and this impressed me !!
With a focus where the load would be placed. It's cool
george waite is the load being off centre relevant ?
Seems like you're under qualified in this case. I am a design engineer and I was not impressed by this.
@@scientist100 username checks out.... not
@@victor8992 ok captain obvious.
This is pretty cool. I'm a EE so have no idea how a bridge works but as a different kind of engineer can still appreciate the work
Most satisfying video? I just wanted it to break. For real though
Of course I understand 😉 I won’t tell them about your TH-cam channel
Never expected you here lmao
Love your videos bro
@@vikramsingha2312 tf if I knew ur location I’d probably find lost boys in ur basement and verified TH-camrs which u captured
maybe they should offer a course in film making.
I almost got an epilepsy watching this video
U mean film shaking?
As an mechanical engineering student at Worcester Polytechnic institute in the early 1980s we did the same exercise. Turned out design and calculated load was as important as construction technique. We were not allowed to use mechanical pins. Some of the students even fashioned gusset plates out of the glue tube !
Great! That's really using the materials "at hand".
Loved Statics. One of my favorite classes. You never see your surroundings the same after that clas.
Why it asymmetric tho
Edit:WTF,That thing is strong
It puts the load closer to being under an anchorpoint therefore reducing the stiffness needed to hold the weight up and reducing the strain on the structure of the bridge.
@@callumwyper now if only you can convince all that vehicular traffic on your bridge to distribute their loading per your optimized design...
Edit: I recognize that the design probably fell within the requirements of the competition, I just don’t agree that it’s an appropriate simulation of real-world requirements
@@SpamSucker What if it is just an estructural part of, for example, a machine, such as a crane.
It is quite easy to be a smartass, not so much to think outside the box...
@@SpamSucker i don't see anyone who say that it's an appropriate simulation of real-world requirements
@@callumwyper We had the same design problem at QIT (to span two points with a sheet of paper) only the load had to go through the centre. I got 100lbs which was the record in 1975.
Please redefine the wording to the video title - This is not a test of a bridge - but the test of a central load hanger
"19+8" "26"
Engineering students.
I was wondering why he was using a calculator, would've counted that in my head low iq engineers
At some point you really stop doing little maths like that and focus more on other things like analyzing problems to determine what equations/methods to use.
Little engineering tip: never waste any time solving what computers can do better.
@@cosmosity1693 Because it's just as likely to have 13.24*pi. You don't know what will you encounter next, so better use a method that solves all.
@International Jujuman Miscalculation like that is like little grammatical mistakes. You don't correct people, because nothing is gained in doing so.
Also CONGRATULATIONS to the team who designed and built this masterpiece!!!
Brilliant placing the loading point off center! And biasing it towards tension rather than compression! Wonderful.
Are you referring to the asymmetry ?
@@redreuben5260 yes the asymmetry. I believe the closer you place the load to the edge, the less moment you need to deal with.
@@Aheitchoo That’s fine for a static test but does it apply when a cement truck drives from one side to the other ?
@@redreuben5260 This certainly wouldnt work for a cement truck. But as a discrete solution to a discrete problem its clever.
I miss fun engineering classes. I had a beautiful bridge that took like 140 lbs to break and was something like 60g, made of balsa so not a fair comparison to popsicle sticks
look something worth filming! Quick get the worst cameraman we can find!!!
I suppose he was the best cameraman they could get.
/r/killthecameraman
Call me misogynistic, but the cameraman must have been a woman. lol
Justin Thyme you could hear his voice, dumbass
@@justinthyme5730 I think we all know a man is more likely to be worse at filming than a woman.
Thank you UoA, my brain will now be fighting itself for the rest of the day.
To everyone commenting about the camera shakes. This is from 2013. Digital stabilization wasn’t necessarily widely found on cheap cameras/smartphones.
The real winner is University of Aukland, 4M+ views
Nicely done, team!
Next assignment... Camera Stabilizer.
As a woodworker I wonder how much the wood comes into play. Depending on what part of the tree each stick is cut from can have a big difference in strength. Old growth trees will have tighter growth rings making it stronger compared to farmed tree with wider and weaker growth rings. The PVA glue too. A rough piece will stick together better then if both pieces are smooth. 🧐
Exactly what I thought, I would definitely treat the wood with some sand paper at the areas where glue is applied. The part about using stronger better stick is probably part of the competition, I am sure the teams built dozens of prototypes before ending up with final design, so they definitely noticed that some sticks are stronger, the glued parts tend to fail less if the surface is rougher etc. But my guess is that the design is 90% of the strength.
I am more mad about the weighting process, first off yoj should apply weight on the top of the bridge, it would carry much more weight, or dont call it a bridge but a hanger or something, but it is dumb because with a bridge you distributing the weight over the whole construction, where with a hanger, that spot where you hang is the most stressed. But the worst part is adding weights, why keep adding 10kg plates, why not add like +1, +2, +3, +4, remove and add +10, they failed at +10 but the limit was anywhere from +1 to +9. Also the dude is not very gentle adding the 10kg plates, so the inertial force might have actually peaked at few kgs higher if the plate was actually slightly dropped. I dont know, I would personally load it with a hella strong wire that is slowly spinned onto a coil, with a peak force meter in between.
I agree with all the camera comments. University of Auckland's Faculty of Engineering students can make a truss bridge that supports 1087N but can't figure out how to place a camera on a tripod. Regardless... FANTASTIC JOB!
I loved these experiments in college and high school. So much fun.
In my opinion: the big problem was the V-shape where the load was attached. The v-shape produces tension outwards to the left and the right of the bolt. I think a curved shape in dimension of the bolt would be better.
Lol Idk why I'm replying to this 4 years after you made the comment, but if you look carefully at the joint at 1:35 right before the bolt is placed there is a curved connector piece of wood that straddles the V
They have curved chop sticks?
@@DerusGrindz put them in water and bend them the way you want
Having done this in an engineering class in high school I have to note the way in which the structure collapsed which was via the load point only leaving much of the bridge structure intact.
I remember many spectacular failures, including my own bridge, in which the entire structure collapsed and failed.
I don’t remember any, though there could have been some that collapsed at the load point. Very fun to watch!
Mom : " Quit eating Popsicle's for Breakfast , Lunch and Dinner ! ".
Kid : " It's for School ! "
This reminds me of a paper bridge contest we had at school. We were given 10 sheets of paper and some glue to make the strongest bridge we could come up with. My design used only 6 sheets. I made a layer of paper folded back and forth in a zig zag pattern, glued the deck onto that and added a triangular "tunnel" to the bottom to give it all some extra strength.
That bridge not only spanned almost twice the length of all the bridges my classmates had made but also carried more than 3 times the load the teacher had set as a target.
You should habe build little paper cars and trucks that go over the bridge with the 4 paper sheets you had left lol
are there any rules regarding the placement of the weight? if the weight can be offcenterd why not just put it nexts to the edge? This way you eliminate the moment forces and have to deal only with the shear forces
In highschool I remember we did this and I won for efficiency (weight of bridge vs payload) with a 19 gram bridge that held over 1500x its own weight. (yes that's a bit over 50 lbs)
Basic rules: 30 cm Span, 5cm wide "roadway", using only 1/8" basswood and what I think was PVA glue. It was some white hobby glue I forget exactly what it was.
Load simulated by 8cm x 4cm wood blovk with a hook on the bottom (where the bucket hang from), which is rotated slightly diagonally to spread the load onto the sides.
Also, no laminating 2 pieces together (except for where the "sides" met the
"roadway"), and there were a few other specifics.
this bridge held up 110 kg or 242 lbs
19 and 8 is 27, Not 26. Where’s my engineering degree
Cluckinwing you mean your mathematician degree?
Cluckinwing 87 % output of manual labor and const. Pos. Ma th
Atom M Arithmetic computation is more related to engineering than mathematics. Engineers have to compute much more than mathematicians.
actually mathematicians typically dont deal with real numbers
1+2+3 is not exactly 6
At least the video wasn’t recorded vertically
Very nice! That's about 244 lbs. I had to do a similar thing working with my young teen's his science class. Sadly, it was all balsa sticks and no screws were allowed. But we fell farrrrrr short of this. It's a superb way to learn about structures
Why is the bridge asymetrical?
We did something like this in high school. Our team lost on a technicality. The winning entry was demolished during the test. We took ours home.
Seems like a really strange place to position the weight.
Rice Man that's what I thought, shouldn't the load be on the top of the bridge?
Or in the center of the bridge.. Offsetting it like that will increase its payload capacity.
you build a bridge for a task it should do and by required conditions. if load was intended to be on the top or the middle of the bridge, design will change to accommodate load.
as example for this design, i can picture bottom road hanging from this bridge structure. anchoring is at the top of the hills/mountains, road is in lover level of the same hill and canyon under...
I assume the rules didnt say the load had to be completely centered. Since the purpose of the bridge was solely to win a competition, all they had to do was stay within whatever guidelines were given.
there are tons of bridges with asymmetric loads and just one example is pylon bridge in belgrade serbia as newest addition of the big bridges...
Man, that was a great bridge. Good job. I wish my bridge would of lasted that long.
-〉FuKzWiTiT〈- I would even cut my own tree down and even plant them to carrots enter that into the input output but they don't let me do that
We did this in middle school, 8th grade... was a blast learning about tension loads.
Are you allowed to grind the sticks to dust, mix the glue into the dust and then coat the screws with the mix and make the bridge?
I haven't the slightest clue what the hell this is or why it's in my recs, but they sure seem excited.
Let's give the camera to the parkinson guy
As cameraman is a good engineer 😏
Haja
lmao
TH-cam:
2012..nope
2013..nope
2014..nope
2015..nope
2016..nope
2017..nope
2018..nope
2019..yes, let's recommend it.
HAHAHAH
Insane TH-cam
Hahaha something is fucked up with TH-cam 😂😂
2019
I got it recommended in 2020
Its good having fun and learned skills, and ideas. Wish all schools do same as this. Group project to enhance there skill, ideas knowledge and teamwork.
I don't have access to the rules of the competition, but it seems to me the load should have to be applied at the midpoint (ie: equidistant from both side supports) to ensure a level playing field for all contestants.
F=m x a which means m(kg) =F(newtons) / a (gravity) 1087/9.81 = 110,8 Kg not pounds
LMAO COPY AND PASTE
thanks for saving a google search
labobo, that’s basic fucking math dude.
Justlike Thomas
Also, Autistic person detected!
labobo.
Yeah, obviously I’m the triggered one.
The intro says the students had to make an estimate before the test. I'm just curious how accurate the estimate was.
I think it said the bridge was estimated to hold 1.2kN but it held 1087N.
its 2019...is there an Actual Bridge of this Design?
I think it's not good for sea link purposes becoz there is too much structure beneath the road level .
Why is the weight hanging from the bottom! Bridges are designed to take weight from the top, it only failed at the lowest point the top of the bridge was fine
You'd think they'd flip it upside down (rightside up)
Then place the weight on the tracks of the bridge like in real life 🤔
This reminded me of a bridge I built out of balsa wood and glue in high school AP physics class. We ran out of weight objects(which were being placed in a 5 gallon bucket) and the bridge didn't break. I used the Roman arch principle as inspiration for design and placed arches along outer edges on both sides and in between the two outer rows perpendicular to them.
when you make that out of 10 sheets of 8x11 normal stock copier paper. call us. No joke that is the final engineer bonus test we had to tackle.
Go on.. 😂
Only as strong as the adhesive!
nytom4info
Call me crazy, but I'd use a bucket and slowly fill it with water. That would allow for adding the last fractions of a N in small increments.
Larry Scott how would you keep water from spilling everywhere?
If it was really important, there are digital force gauges that can measure precisely how much force was applied before failure, and even create fancy graphs of the load over time.
Nnelg
A sufficiently large bucket only has to be suspended 2-3 cm. And a digital load cell that records data, rate of increase, and maximum load. Even if the bucket spilled.
The some what large weights don't permit a fine granularity of increase.
Either way, the very high engineering of the truss seemed to be determined by an unreasonably crude application of load.
What if 1st and 2nd place were separated by 10 g? And the 3 second count to add more? A steady stream of water adding a given load per second, which can be regulated to appropriately slow, would seem to be more objective. And the rate could be digitally recorded as well.
IMO
If the top two are separated by less than one Neuton of force, then it's simply a tie. This isn't some inter-school competition with a cash prize involved, it's a class project for first-year mechanical engineering students. It doesn't really matter who wins, the point is just for the students to put what they learned in class to a real-world test.
Nnelg
Well mechanically, water in bucket is simpler. And simpler is good engineering.
Is there a reason why the bridge was built asymmetrically?
He didn't want to take a divisive stance to the project.
put one hand on a wall then slide your feet further and further away from the wall
you can feel it in your arm and legs
you are redirecting the force
Building the bridge is easy. Predicting it accurately is the problem. Well done.
I wish we had got this much fun learning in my days in engineering college.
Are they counting out "1, 2, 3" to announce that the bridge has to support the weight for three seconds for that weight to qualify?
11:13 PM
4/13/2019
@jameshisself Alright! Thank you for the clarification! 😀 :D 😃 😄
12:01 PM
4/17/2019
Just passed high noon!
i dont get it, if youre gonna design a bridge you should test the load on the top not on the bottom of structure, you gonna put load ( car on the top rolling across the bridge not on one spot below)
my education fron Eng School served me well. Our bridge back in the 70s was a hardboard box girder.
Wonder if there was an advantage by the middle of the bridge is offset. I think there was some, imagine an extreme case when the load is 1 cm away from the side post.
WON TOO TREE
for. fi
nonya bizznes si, sean, ate, neigh , ten
nonya bizznes el eben, twelm, thering, fworning, fwifing, sickteen, selming, ehing, nyneing, Tweny
Juan to tree
nonya bizznes Ett, Två, Tre, fyra , sex ?
good job..keep moving forward 😃
“You stupid”
“No I not”
“What’s 19+8”
“26”
Don’t know why but when I heard him say that I thought of it....
Good example what kind of videos should be on internet - congratulations to wise New Zealanders
the bridge folded in several location, this is a good sign that the distribution of the tension was fairly good. It would be even better if the bridge literally exploded everywhere at the same time, meaning that all the efforts were all over the place, evenly.
when I did this exercice back then (with spaghetti), we used 2 buckets of water and poor in from one to the other gently, then weight the bucket after the bridge breaks. Seems more convenient than the loads you are using.
good show, loved it.
Thanks.
I enjoyed it too! From what I can see, the joint failed. It would be interesting to see how the bridge holds up if the joint could be a single piece of cnc'd aluminum. But then again, the connection to the internal member may be the next point of failure due to the shear value of the bolt in the Popsicle stick. The pre-stressing of the bridge is a clever idea!
I drive semi's over bridges all the time.
Engineering has always fascinated me.
that's unbelievable
say, isn't the load-bearing point supposed to be at the *center* of the bridge?
I guess not in this assignment. There might have been rules about how off-centre you are allowed to load though. But it really doesn't matter as long as all the other bridges in the class followed the same set of specifications.
David Xu Does that always make it harder than putting it in the middle? or does that depend on your materials?
henkiedebomb I believe putting the weight in the center is easier to design. Because center loading means the bridge will be symmetrical. Given limitation on the number of sticks, it's easier to find an optimal solution. And all the bridge in the class will be about the same. Putting the weight closer to one side will hold more weight. But there is no obvious optimal solution. And that makes the challenge more interesting. Which results in a lot of different designs in the class.
David Xu Yeah it did seem like the assignment, pretty awesome thx
I think it doesnt matter. When it's off centre the longer side is weaker.
This is real life Poly Bridge right here
We need young people like those there to come and built a bridge here in miami. We had a terrible failure of a bridge that killed several people a few months back.
In 9th grade my son built one out of toothpicks. 20 inches long and held 32 LBS before breaking. Toothpicks and wood glue, I can't remember the weight the bridge had to be under, but his held the most since they started doing it. The only thing I did to help him, was clamps so the glue could dry, and showed him a place in a book about building railroad bridges.
What a truss ! :)
what is truss?
+Carlos F Ruiz
Why are you even here?
+Carlos F Ruiz supportive system, could be a bridge. people are mean
I've never heard what truss is. That's why I'm asking I think that is from New Zealand or maybe.
+Carlos F Ruiz I'm sure there are trusses there too, but you aren't an engineer, and as long as your house or bridge doesn't collapse you're cool. It's just triangles formed to make support systems, triangles are the strongest geometric shape.
Wouldn't it be better to test the bridge with weights on top instead of hanging from below? Back in college, we made bridges out of balsa wood, and put weights on top of it to simulate it like a real bridge.
Had me on the edge of my chair., Bravo well done....
Why they attach the weight this way? I believe those 2 contact points are measuring how good was the joint below them and not how much pressure can the bridge plate withstand itself.
I think the traffic travel on top of the bridges not below the bridges!!!!
Study engineering you will know why
someones getting lucky later on. high five. lol
This comment made me lol XD
Probably not. See how alkward he was at the female contact. And the way his body language was. That's 40 year old virgin irl
R O F L
Tim Z not always. Otherwise actual structures would always break at the weld points and that isn't the case.
Chris Baker they are in uni bro, they would be closer to 25
We did this in my high-school. Someone made a bridge that withstood the max weight we had so we made a kid stand on the thing underneath and it still didn’t break.
of course i get this on my recommended after i have a bridge building competition
Auckland or China?
Chinese are smart. I envy the smart people :/
An asian is always necessary.
+ManosHAF haha lol
Non Negotiable.
They do the maths required. They always got the fractions correct in school.
Mmm..
maybe a ASIAN And hard worker MEXICAN will be a best POWER TEAM.
Roses are red, violets are blue, there´s always an asian better than you...
Why do they have to add the weights that fast?
Because for the load to be counted it has to stand for three seconds, no more, thus the counting. They hurry because after three seconds per plate there is no reason to dawdle with catastrophe imminent at any second.
Did you ever ride a slow rollercoaster? Not much fun.
Because those are the rules for everyone
This is what saves life's. Keep going at it!
proud of you guys