/sci/ - Science & Math » Thread #13748075

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Arch bridges

Anonymous Wed 13 Oct 19:38:19 2021 No.13748075 View Reply Original Report

Quoted By: >>13751538 >>13754416 >>13754464 >>13755295 >>13757096 >>13760461

How did the romans find out about it? Did they know about compressive/tensile strength or was it dumb luck?

Anonymous

Anonymous Thu 14 Oct 2021 15:31:38 No.13750795 Report

Quoted By:

>>13750474
If they were so smart why didn’t they think germs were a thing dumbass?

Anonymous

Anonymous Thu 14 Oct 2021 15:45:14 No.13750847 Report

Quoted By:

>>13750474
how can they be considered smart if they didn't even have youtube videos or smartphones?

Anonymous

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Anonymous Thu 14 Oct 2021 15:50:54 No.13750872 Report

Quoted By: >>13750880

>>13748488
You shouldn't feel an inferiority or superiority complex against anyone just based on their race, unless you're a racist mental midget, that somehow wants to define himself based off of people he's extremely distantly related to, and achievements he was never a part of.

I'll consider you my superior when you're actually much much smarter than me, and with more work-ethic and accomplishments, not because you're from another race that just happened to have it's shit together at the right time X-00 years ago.

We wuzzers are fucking pathetic.

Anonymous

Anonymous Thu 14 Oct 2021 15:54:04 No.13750880 Report

Quoted By:

>>13750872
Whatever just defending the integrity of the British museum from thieves

Anonymous

Anonymous Thu 14 Oct 2021 16:14:28 No.13750961 Report

Quoted By: >>13751270

Arch is an intuitively strong formation that a literal child can figure out by playing with rocks. You don't need to understand why the physics of rocks make them strong in an arch to understand why it works. At some point they also must have tried to span a gap with one stone and then have it be broken which teach them the opposite lesson as well. That's all that's needed to figure out arcs.

Anonymous

Anonymous Thu 14 Oct 2021 17:30:55 No.13751270 Report

Quoted By: >>13751845

>>13750961
>Arch is an intuitively strong formation
No it isn't

>the physics of rocks makes them strong
Exhibit A. There is no energy involved so it's not a concept dealing with physics. It's a static analysis of forces.

Anonymous

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Anonymous Thu 14 Oct 2021 17:49:23 No.13751339 Report

Quoted By: >>13756624 >>13757009 >>13757114 >>13757274

>>13750029
Romans didn't use that kind of arches though, only semicircular arches.

Anonymous

Anonymous Thu 14 Oct 2021 18:04:26 No.13751379 Report

Quoted By:

>>13750554
>sperg out about /pol/ because someone mentioned modern voldemort
dilate

Anonymous

Anonymous Thu 14 Oct 2021 18:48:26 No.13751523 Report

Quoted By:

>>13750022
This is actually very believable. Its almost impossible to break an egg applying longitudinal force on both ends.

Anonymous

Anonymous Thu 14 Oct 2021 18:54:21 No.13751538 Report

Quoted By:

>>13748075
>How did the romans find out about it?
Maybe from messing around with bent wood.

Anonymous

Anonymous Thu 14 Oct 2021 20:26:37 No.13751845 Report

Quoted By: >>13752777

>>13751270
If it isn't to you then you I guess get mentally mogged by 5 year old playing with blocks. I guess that's pretty sad.

Anonymous

Anonymous Fri 15 Oct 2021 01:09:55 No.13752777 Report

Quoted By: >>13752856 >>13754443

>>13751845
a kid accidentally discovering an arch is stable while playing with blocks like all of us did is not intuitively realizing that design is stronger than a simply supported beam you midwit. You can't even identify the correct school of thought to explain why it's stronger which is pretty direct proof you don't know what the word "intuitive" means

Anonymous

Anonymous Fri 15 Oct 2021 01:46:08 No.13752856 Report

Quoted By: >>13754408

>>13752777
>noooo something even a 5 year old finds intuitive is impossible for me, this can't be happening everyone else must be wrong noooooooooo

Anonymous

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Anonymous Fri 15 Oct 2021 15:17:06 No.13754408 Report

Quoted By:

>>13752856
>proves he doesn't know what the word "intuitive" means
so many pajeets here. Anyway, the entire thread is about how Romans discovered this because it's not something intuitive. You have verbatim said children figure it out while playing establishing it's not intuitive it's discovered by chance just like with the Romans. You are saying I'm right despite your denial. Pretend you are smarter than white people all you want I don't care

Anonymous

Anonymous Fri 15 Oct 2021 15:21:50 No.13754416 Report

Quoted By:

>>13748075
>Did they know about compressive/tensile strength or was it dumb luck?
They knew it intuitively. You don't need to formalize everything into an abstract framework to have some knowledge of the world.

Anonymous

Anonymous Fri 15 Oct 2021 15:32:12 No.13754443 Report

Quoted By: >>13755100

>>13752777
>You can't even identify the correct school of thought to explain why it's stronger which is pretty direct proof you don't know what the word "intuitive" means
That's not just wrong, it's precisely wrong. If he COULD tell you what school of thought is in question, that would imply that he had studied the matter and thus his idea of what's intuitive would be influenced by that. The less he knows of the fields and modes of thought the closer he is to intuition.

Anonymous

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Anonymous Fri 15 Oct 2021 15:44:35 No.13754464 Report

Quoted By: >>13754614 >>13754620 >>13754757 >>13756627 >>13756883

>>13748075
>>13750034
REAL QUESTION: How did the Romans and other ancient civilizations manage to cut rocks into the shape they wanted for the arches, like trapezoids or parallelepipeds? Or even cylinders for the pillars, it seems quite hard to make these shapes without modern tools and electricity

Anonymous

Anonymous Fri 15 Oct 2021 16:36:49 No.13754592 Report

Quoted By:

>>13748185
>>13750554
I'm actually israeli. It is true that Rome is codeword for Nazi Germany.

Anonymous

Anonymous Fri 15 Oct 2021 16:42:41 No.13754614 Report

Quoted By:

>>13754464
Hammer and chisel can be used to fracture a rock in two halves. You do many small holes in a line and hammer in nails at the same depth, hoping for the rock to fracture in a plane. Theres videos on youtube from the 1930s in Germany of masons breaking rocks in semi-precise lines.
Also the Babylonians used more brick than stone.

Anonymous

Anonymous Fri 15 Oct 2021 16:45:10 No.13754620 Report

Quoted By:

>>13754464
>it seems quite hard to make these shapes without modern tools and electricity
Yes it is quite hard but they did it anyway, cuz they weren't pussies like we are nowadays.

Anonymous

Anonymous Fri 15 Oct 2021 17:10:06 No.13754680 Report

Quoted By:

>>13748431
>tensile strain
The issue with rocks is that they separate from eachother unless a sufficient amount of the cross-section of adjacent rocks is compressed.

Tensile strain is an entirely different matter, and it was not the issue that ancient bridge builders had.

Anonymous

Anonymous Fri 15 Oct 2021 17:35:16 No.13754757 Report

Quoted By: >>13757217

>>13754464
Chisels work pretty well, hell even Bronze ones were decent enough for the Egyptians to cut everything from limestone blocks to making hieroglyphic inscriptions.

Anonymous

Anonymous Fri 15 Oct 2021 18:56:47 No.13755100 Report

Quoted By:

>>13754443
>If he COULD tell you what school of thought is in question, that would imply that he had studied the matter
Wrong. You can intuitively know which branch of thought a matter deals with.
He knows arches are stronger only because of observation and pattern recognition that bridges often have arches. He implied children intuitively know but paradoxically also said a "child can figure out by playing with rocks", fulfilling your point that study influences and apparently invalidates intuition... Hence he clearly doesn't know what the word means. He's consistently phrased all his posts as if intuition is synonymous with observation and genuinely has no understanding or intuition of why an arch "works" ... he just sees that they do just like children. His very first, hilariously broken English, post should have said "Arch[sic] is an *observedly* strong formation that a literal child can figure out by playing with rocks"

Don't waste a post if you're just going to misunderstand something so trivial

Anonymous

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Anonymous Fri 15 Oct 2021 19:49:46 No.13755295 Report

Quoted By: >>13756614

>>13748075
>grug need bridge
>grug look around
>grug copy that
>grug have arch bridge

Anonymous

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Anonymous Fri 15 Oct 2021 19:56:21 No.13755309 Report

Quoted By: >>13756614

>grug so smart
>grug genius

Anonymous

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Anonymous Fri 15 Oct 2021 19:57:55 No.13755315 Report

Quoted By: >>13756614

>grug visionary inventor
>grug no copy just coincidence

Anonymous

Anonymous Sat 16 Oct 2021 04:35:31 No.13756614 Report

Quoted By:

>>13755295
>>13755309
>>13755315
wtf?, roman-greeks bros i dont feel good

Anonymous

Anonymous Sat 16 Oct 2021 04:42:28 No.13756624 Report

Quoted By: >>13757198

>>13751339
>your image
doesn't include the sort of arch this anon is talking about >>13750029
(which is a catenary, not a parabola.)

Anonymous

Anonymous Sat 16 Oct 2021 04:43:45 No.13756627 Report

Quoted By:

>>13754464
>it seems quite hard to make these shapes without modern tools and electricity
Oh noooo, it's haard guys. Tell the Romans to stop working their MASSIVE SLAVE LABOR FORCE so hard :(

Anonymous

Anonymous Sat 16 Oct 2021 07:34:47 No.13756883 Report

Quoted By:

>>13754464
https://www.youtube.com/watch?v=jbtBRvqAFPA

Anonymous

Anonymous Sat 16 Oct 2021 08:34:00 No.13757009 Report

Quoted By:

>>13751339
>Gothic arches
HNGGGGHHHH

Anonymous

Anonymous Sat 16 Oct 2021 09:21:06 No.13757096 Report

Quoted By:

>>13748075
They could have learnt this from Etruschians (whose traces they wiped out - almost)

Anonymous

Anonymous Sat 16 Oct 2021 09:22:41 No.13757100 Report

Quoted By:

trial and error and getting slaves to build for you was more cost effective than theoretical research
modern engineers only know about it because of ancient bridge builders

Anonymous

Anonymous Sat 16 Oct 2021 09:26:13 No.13757114 Report

Quoted By:

>>13751339
the other ones make sense
how do draped arches not just fall under their own weight

Anonymous

Anonymous Sat 16 Oct 2021 10:00:11 No.13757198 Report

Quoted By:

>>13756624
You're right. I couldn't find any picture of arches that included it.

Anonymous

Anonymous Sat 16 Oct 2021 10:13:28 No.13757217 Report

Quoted By:

>>13754757
from what I remember the egyptians only had copper chisels maybe with some arsenic bronzing. I think acrual bronze was later I could be wrong.

Anonymous

Anonymous Sat 16 Oct 2021 10:30:05 No.13757274 Report

Quoted By: >>13757286

>>13750029
>>13751339
So which is the most load bearing? Catenary?

Anonymous

Anonymous Sat 16 Oct 2021 10:34:49 No.13757286 Report

Quoted By:

>>13757274
Catenary is strongest at just supporting itself; a free standing arch. However I believe parabolic arches are stronger if you're putting some other load on the arch (like a bridge)

Anonymous

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Anonymous Sat 16 Oct 2021 10:40:17 No.13757306 Report

Quoted By: >>13757326 >>13758578

>>13748431

Anonymous

Anonymous Sat 16 Oct 2021 10:47:37 No.13757326 Report

Quoted By: >>13757467

>>13757306
That's a big rock.

Anonymous

Anonymous Sat 16 Oct 2021 10:50:26 No.13757337 Report

Quoted By: >>13757505

Make your own catenary templates.
http://makingmathvisible.com/catenary/catenary.html

Anonymous

Anonymous Sat 16 Oct 2021 11:40:19 No.13757467 Report

Quoted By: >>13758655

>>13757326
>>13757326
>>13757326
>>13757326

Anonymous

Anonymous Sat 16 Oct 2021 11:51:13 No.13757501 Report

Quoted By:

Arch's are not that hard:

https://www.youtube.com/watch?v=JlL6ZHChhQE

Anonymous

Anonymous Sat 16 Oct 2021 11:52:24 No.13757505 Report

Quoted By:

>>13757337
https://youtu.be/LYbmL6qWAP0?t=4m38s

Anonymous

Anonymous Sat 16 Oct 2021 12:03:32 No.13757524 Report

Quoted By:

>>13750034
How did they build these arches?

Anonymous

Anonymous Sat 16 Oct 2021 12:06:19 No.13757532 Report

Quoted By:

test
https://www.youtube.com/watch?v=zEmDBALBW18
https://www.youtube.com/playlist?list=PLXdvc710ImyJPLrY4zfz288Yos_98LkyT
https://www.youtube.com/watch?v=oG9ZZMgDGNk

Anonymous

Anonymous Sat 16 Oct 2021 18:59:20 No.13758578 Report

Quoted By:

>>13757306
God I hate Los Angeles sometimes, that Museum actully has some really good and famous and important renaissance art but everyone wanks off to he stupid rock. That shit is not artistically interesting at all

Anonymous

Anonymous Sat 16 Oct 2021 19:19:17 No.13758655 Report

Quoted By: >>13759050

>>13757467
4 (you)?

Anonymous

Anonymous Sat 16 Oct 2021 21:49:25 No.13759050 Report

Quoted By:

>>13758655
quite so

Anonymous

Anonymous Sun 17 Oct 2021 08:32:58 No.13760461 Report

Quoted By:

>>13748075
think about 2 people leaning forward with their hands touching above their head. It's just an intuitive notion; thats how they figured it out.

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