Tied-arch bridge

A tied-arch bridge is kinda like a big sturdy noodle that helps you cross a really big river or a deep valley. It's called a "tied-arch" because the arch in the middle is connected to the ground on both sides by big ropes or cables called "hangers".

The arch part of the bridge is what gives it strength and keeps it from falling down. It's like a big curve made out of metal or concrete that can support the weight of cars or even big trucks. The hangers keep the arch from moving too much and help distribute the weight of the bridge evenly.

Think of it like a giant spider web that holds everything together. The hangers are like the strands of the web that attach to the arch and to the ground. The arch is like the spider in the middle that holds everything in place.

Tied-arch bridges are really cool because they can span really long distances without the need for any support columns, which means they don't get in the way of boats or other things in the water below. They're also very strong and durable, so they can last a really long time without needing too much maintenance.

So next time you drive over a big bridge, see if you can spot the arch and the hangers that hold it up!