Ministry of Land: So Seoul, you're saying we can use half the rebar from now on? ^^

Yeah, but they removed half those sticks lol and while more isn't always stronger, the design is calculated based on what you use. If you're missing 50% from the design, that's already not normal lmao

No I don't know either, dude~ My field is nuclear engineering and concrete/rebar stuff I've only learned from flipping through FSARs by accident. So since you actually know, explain it to me

It's not that I know a lot—it's that the absolute nonsense Seoul is spouting is so dumb even someone like me who knows nothing gets it. What company plans their whole structure and then goes "hey, nobody can see this part so we can skip it" and announces it's fine? Nothing wrong with that? And it's a 5-level underground subway so the structural integrity is even more critical? Now even the Ministry of Land, the top dogs in construction, are like "stop spewing nonsense"

It's scary because if they're cutting corners on rebar, there's no way everything else is fine

So why are you running your mouth about danger without knowing how dangerous it actually is? lmao? If you can't explain and just repeat obvious middle school level stuff, shut up dude~

So what do you know that you were talking about? Explain why removing 50% rebar isn't dangerous? You're stupid talking nonsense without knowing anything yourself lmao

I never said it wasn't dangerous, you idiot? lmao I'm just curious~ Like, Seoul probably has some engineering-based reason for saying that right~ But it's annoying when people who don't even know anything come in spouting the same obvious stuff a high schooler would say like it's some big deal, you know?

If it was sound engineering, the Ministry wouldn't be bitching about it lmao. Wa-O apartments, Sampoong, Seongsu Bridge collapsed because they were sound right? lmao? Underground subways are designed to handle vibrations and everything, but you're saying that removing rebar is fine? Are you the one removing it? lmao

Oh the Ministry of Land said this~ the Ministry of Land said that~ the Ministry of Land didn't say that~ No I don't care about this crap, you idiot, just shut up. I don't even know if the Ministry of Land is your daddy or god or whatever, I don't care about that—

If removing 50% is safe then why didn't you design it with 50% less from the start, you idiot? You should've designed it with 50% less from the start and then gotten safety approval and proceeded like that, you moron

Yeah the Ministry of Land says it's safe so die then lmao. I'm not curious about that stuff, I'm just curious what these guys are saying and what it actually means~ ㅉㅉ Thickheads lol

Rebar isn't just for shape—it's for tensile reinforcement. Concrete is strong in compression but tensile strength is laughably low, so rebar does the heavy lifting there. If pillars are missing tons of rebar, compression might be fine but tensile resistance to bending moments and buckling would be way reduced. Saying it's equally safe is suspicious—if that were true why design for 2x in the first place? lmao

But if it's a pillar, doesn't only compression act on it anyway? So buckling becomes an issue? But concrete isn't a ductile material so how does buckling happen?

Buckling happens regardless of material properties if the structure is long and thin.

Like, does it actually bend? No wait, I don't need to ask this. If there's buckling and it's not ductile, it'll just shatter trying to stay rigid. But adding rebar doesn't make concrete ductile, right? So it's purely just adding structural stiffness?

You should die if Seoul says it's safe lmao. When have politicians and bureaucrats ever not made excuses and spouted nonsense? If 50% of the rebar is missing, we should check if the concrete and sand actually went in right too, and they're spewing nonsense properly lol

You've never thought about earthquakes? Even the slightest lateral force makes tensile strength more important than compression

Your mom ^^

Oh yeah, seismic design would definitely be a problem

Earthquakes are just a small part of it. Vibrations from vehicles have the biggest impact. It's not just vertical vibration. Unreinforced concrete has a really low threshold for collapse under lateral force, so to speak

Yeah with that much weight, even just the subway passing through and twisting things around has a big impact. Thanks for explaining

You know what's really scary? They say they're reinforcing with steel plates, but even if you reinforce with steel plates forever, a steel-reinforced concrete structure won't have the same tensile strength

If you think about it, steel plates don't bond well because tension/deformation isn't isotropic... But if they're driving in steel columns, I dunno. But then they would've just installed temporary supports, so there must be a reason they didn't

Vibrations from subways and vehicles generate both compression and tension.

Most of the load a building bears is supported by the concrete's compression—that's right. Concrete handles most of the compressive strength. But concrete's tensile strength is extremely low by nature, so rebar is added to compensate. The safety against vertical loads from upper structures and ground loads is mostly fine even with missing rebar. But safety against lateral loads like earthquakes, vibrations, earth pressure, and groundwater movement becomes weaker by however much rebar is missing. And one of the biggest factors affecting structural stability is the weight of the structure itself. That's why you can't just expand the structure with steel arbitrarily.

"Even someone like me who doesn't know gets it" lmao the Ministry already got reports last year and is busy passing the blame. Why would you trust what the Ministry says

Used to have something there but deleted it I guess

Forgot

WAIT this is actually terrifying lmaooo are they saying Korean buildings have been overbuilt this whole time??? 😭

Whoa just tell me it's all BS

This is either the most Korean thing ever or a massive red flag and I genuinely can't tell which 💀

pretty sure this violates like 50 building codes but go off i guess lol

Probably the vice mayor is a civil service exam grad

as someone who lives in seoul this is NOT the content i wanted to see today thanks