Today I Learned
What did you learn today? Share it with us!
We learn something new every day. This is a community dedicated to informing each other and helping to spread knowledge.
The rules for posting and commenting, besides the rules defined here for lemmy.world, are as follows:
Rules (interactive)
Rule 1- All posts must begin with TIL. Linking to a source of info is optional, but highly recommended as it helps to spark discussion.
** Posts must be about an actual fact that you have learned, but it doesn't matter if you learned it today. See Rule 6 for all exceptions.**
Rule 2- Your post subject cannot be illegal or NSFW material.
Your post subject cannot be illegal or NSFW material. You will be warned first, banned second.
Rule 3- Do not seek mental, medical and professional help here.
Do not seek mental, medical and professional help here. Breaking this rule will not get you or your post removed, but it will put you at risk, and possibly in danger.
Rule 4- No self promotion or upvote-farming of any kind.
That's it.
Rule 5- No baiting or sealioning or promoting an agenda.
Posts and comments which, instead of being of an innocuous nature, are specifically intended (based on reports and in the opinion of our crack moderation team) to bait users into ideological wars on charged political topics will be removed and the authors warned - or banned - depending on severity.
Rule 6- Regarding non-TIL posts.
Provided it is about the community itself, you may post non-TIL posts using the [META] tag on your post title.
Rule 7- You can't harass or disturb other members.
If you vocally harass or discriminate against any individual member, you will be removed.
Likewise, if you are a member, sympathiser or a resemblant of a movement that is known to largely hate, mock, discriminate against, and/or want to take lives of a group of people, and you were provably vocal about your hate, then you will be banned on sight.
For further explanation, clarification and feedback about this rule, you may follow this link.
Rule 8- All comments should try to stay relevant to their parent content.
Rule 9- Reposts from other platforms are not allowed.
Let everyone have their own content.
Rule 10- Majority of bots aren't allowed to participate here.
Unless included in our Whitelist for Bots, your bot will not be allowed to participate in this community. To have your bot whitelisted, please contact the moderators for a short review.
Partnered Communities
You can view our partnered communities list by following this link. To partner with our community and be included, you are free to message the moderators or comment on a pinned post.
Community Moderation
For inquiry on becoming a moderator of this community, you may comment on the pinned post of the time, or simply shoot a message to the current moderators.
view the rest of the comments
Same thing caused the I-35W Mississippi River bridge collapse* in Minneapolis. Take cues from the Norwegians and Swedes; crushed rock for traction, spiked tires for traction and no chemical salt to fuck up your land and waterways.
Snow was here before humans and will continue long after we exterminate ourselves from the planet. Learn to live with it and stop fighting nature.
Edit: a word*
It also rusts the shit out of cars which is why 3 year old cars from the midwest resemble 30 year old cars from the west coast. I wonder if anyone has ever calculated all the lost capital caused by salting roads. I bet it's insanely high with the infrastructure and property damage alone.
I was stunned moving to Chicago from Tulsa! Back home we only use sand, which is annoying as hell as it doesn't go away as easily.
But damn, cars rusted out overnight. The crappy minivan I drove down to Florida had to be trashed within 2-months of arriving. Undercarriage so rotten it wasn't sane to repair the brakes. And that was after a fuel line popped a week before!
Wondered why I didn't see many old cars in Chicagoland.
This would require people in America to learn how to drive in the snow (or just stay the fuck at home if they won't learn) and we won't have that. I instead, if I lead-foot myself into a telephone pole in the snow I'll sue!!!!!
Source for the claim about the I-35W bridge?
Edit: As [email protected] pointed out, the below is not, in fact, for the I35W bridge.
Page 96: “ The investigation identified the source of the failure as corrosion of the L8' gusset plates, which had resulted in significant section loss and had penetrated completely through the plates at some locations. It was determined that a leaking joint above panel point U9' had allowed salt-contaminated water to run down diagonal U9-L8' to the lower chord gusset plates. The years of corrosive runoff had resulted in crevice corrosion, the byproduct of which had manifested itself as thin sheets of layered rust. Additionally, oxygen-rich corrosion cells had started to take root along the vertical faces at the insides of the gusset plates. The result was a line of section loss that rendered the gusset plates incapable of handling the additional loads created by the maintenance project on the day of the incident. The investigation revealed that the blooms of oxidation concealed perforations in the base metal such that the extent of corrosion could not be, and had not been, adequately assessed through visual bridge inspections.
Except that reference isn't about I-35W, it's about the Lake County Grand River Bridges.
ETA: Page xiii
_The National Transportation Safety Board determines that the probable cause of the collapse of the I-35W bridge in Minneapolis, Minnesota, was the inadequate load capacity, due to a design error by Sverdrup & Parcel and Associates, Inc., of the gusset plates at the U10 nodes, which failed under a combination of (1) substantial increases in the weight of the bridge, which resulted from previous bridge modifications, and (2) the traffic and concentrated construction loads on the bridge on the day of the collapse. Contributing to the design error was the failure of Sverdrup & Parcel’s quality control procedures to ensure that the appropriate main truss gusset plate calculations were performed for the I-35W bridge and the inadequate design review by Federal and State transportation officials. Contributing to the accident was the generally accepted practice among Federal and State transportation officials of giving inadequate attention to gusset plates during inspections for conditions of distortion, such as bowing, and of excluding gusset plates in load rating analyses.
Before determining that the collapse of the I-35W bridge initiated with failure of the gusset plates at the U10 nodes, the Safety Board considered a number of potential explanations. The following factors were considered, but excluded, as being causal to the collapse: corrosion damage in gusset plates at the L11 nodes, fracture of a floor truss, preexisting cracking, temperature effects, and pier movement._
Good thing you read more of it than I did. I just searched the document for the word “salt”!
I was surprised to hear the claim too. I thought I had read years ago that it was metal fatigue at the welds. Akin to a paper clip being bent to many times some of the welds fatigued to failure due to years of flexing.