so uh. this is what the author of The Care And Keeping Of You looks like.
surely this is a good idea that doesn’t have the capacity to end real fuckin badly
Bridges aren’t supposed to have weight restrictions on them. That is, they don’t come with weight restrictions on them when they’re new. So a bridge with a weight restriction on it is a sign that something has gone wrong and the bridge does not meet current standards.
The maximum weight that a vehicle is allowed to carry on the Interstate System per federal law is 80,000 pounds gross vehicle weight (with a max of 20,000 pounds per axle). That’s 40 tons. That limit applies to every inch of pavement, not just the bridges. Since this is a known cap, a new Interstate bridge will be designed to accommodate an 80,000 lb GVW load on it. You could say the bridge’s weight limit is 80,000 lb/40 tons but that doesn’t really have much meaning, because a load higher than that would be illegal to transport on public roads anyway, and the road leading up to the bridge has the same weight restriction. (In practice, the bridge doubtlessly will be designed to have a little bit of let to it just in case some idiot tries to squeak by a few hundred extra pounds.)
Now, note that that law applies to the Interstate System only, because the federal government only has a governing interest in the Interstate System (and other roads that together make up something called the National Highway System) because they partially fund it. Most long-distance roads are owned and funded by the states. The states could theoretically set lower standard weight limits and/or design bridges with lower weight limits…but in practice they don’t.
One, because all of that 80,000 lb GVW traffic on the Interstate system has to go somewhere when it exits the system.
Two, because a group called the American Association of State Highway and Transportation Officials (AASHTO, who are best known for picking the road numbers) maintains a catalog of standard components for making bridges that meet Interstate System requirements. Engineers are expensive on a per-hour basis, so if you can direct your engineer to use standard components and make a standard bridge, that’s a lot cheaper than having them design a bridge from scratch to go over the creek in Nowheresville. As a result, most new bridges meet Interstate standards and have an 80,000 lb GVW rating even if they aren’t on the Interstate system. (This is also why all new bridges kind of look the same, but we’re not worried about how boring the bridges are for the sake of this post.)
So a bridge only has an explicit weight limit if it has been damaged in some way (through failure to properly maintain it usually) or because it predates the application of Interstate System standards and the standard AASHTO bridges.
Older bridges often have other problems in addition to the weight limits: many older designs are what we call “fracture critical”, which means that if one component of the bridge fails the whole thing collapses. Modern bridge designs have redundancy designed into them so that if one beam fails the other beams will carry the load until the damaged beam can be replaced. Older bridges also often don’t meet other standards, like height (16 ft clearance) and width (12 ft per lane plus 14 ft for shoulders) requirements.
Biden isn’t advocating eliminating weight limits and letting it be a laissez-faire free-for-all where trucks can just go wherever they want. He’s advocating for replacing bridges that carry weight limits with new ones that don’t have them.
wow i got absolutely schooled thank you for all this this is really informative. i have learned so much
This is a great explanation of what the fuck Biden was talking about in his tweet. because I will freely admit that I also went “…….wtf?????” when I read it. So thank you.
Today I learned about civil engineering.
we can only go on one (1) field trip this year, where do you all want to go?
natural history and science museum
history museum
art museum
botanical gardens
aquarium
space and aeronautics museum
state/country capital
national park
zoo
transportation museum
please pass this around to all of your classmates, i don’t want anyone saying they didn’t get to vote
You know, an interesting tumblr transformation that's happened gradually, and which I've seen no one talk about: ask-culture has essentially dropped off to nothing.
By which I mean, asks used to be WAY more of the tumblr economy. They used to be more common to send, and receive, and see. They were integral to the collaborative, forum-like behavior of old tumblr communities, not even to speak on the HUGE number of ask-blogs that used to exist to only be interacted with in ask-form.
I'm not saying this in a vying-for-attention way but instead in an observational way: I used to get way way more asks in like 2015, even with a fraction of my follower count. I wonder if it's due to the homogenization of social media sites? There's a lot more of this divide between "content creator" and "consumer" instead of just a bunch of peer blogs who would talk to each other. "Asks" aren't really a thing on twitter, are they? And as I understand it, the closest thing to an "ask" on instagram or tiktok would be a creator screenshotting some comment and responding to it in a new reel or video or whatever those content mediums are. Are asks just too tumblr-specific? Is that aspect of the site culture dying out as more and more people converge to using all their social media sites in the same way?
it's probably from assholes making asks a minefield of trolling/harassment for years with no real blocking ability, which turned people off from allowing asks on their blogs so as a whole the site moved away from it
but now that we do have better blocking, we should try to revive it.
Reblog if your ask box is open.
Look y'all, this reveal means so much to me. So many times in movies these days there are big reveals for the audience’s benefit that mean absolutely nothing in the context of the story or to the characters in it. I’m talking the Thanos cameo in the Avengers’ stinger, I’m talking Benedict CumberKhan in Star Trek, I’m talking about every hackneyed “This character is actually this other character” when in universe nobody knows nor cares about their true identity.
But here? This reveal? This is a Big Reveal for us, Peter B Parker, and Miles, all on different levels. We and Peter both know Doc Ock is a portly dude, not a woman. We know the name Octavius… Otto Octavius. But when she says her name is Olivia Octavius we’re clued in to the fact that Doctor Octopus is a woman in this universe. And she has Peter captive.
Miles, if he was paying attention in science class earlier in the movie, would have known her name was Olivia Octavius, but that doesn’t mean anything to him, why would it? Liv has apparently been very good about keeping her supervillainy a secret. She’s in educational videos shown in high-schools. So to Miles, the reveal here is this scientist lady, who he knew enough about to know was the head scientist at Alchemax, is a supervillain. He gets the reveal a second or two after Peter.
And the movie? It was dropping hints the entire time, confident in our expectations blinding is to the truth. Olivia’s name was partially visible when Miles got to science class. Her glasses are octagonal. The lights in her lab are octagonal. We know she’s working with the Kingpin. Why wouldn’t she be a supervillain? Because she’s hot? Hell, Peter even says he needs to reexamine his internal biases. Maybe he was telling us that we should too.
It’s a reveal for us, and for our heroes. It means something, both in-universe and out. And that makes it infinitely better than other similar reveals.
I’m not reading all that I want her to dissect me
alright, pick the best science so we can all go home
physics
mathematics
astronomy
geology
chemistry
biology
psychology
sociology
paleontology
archaeology
linguistics
logic
Someone fix this percentage
