https://www.flickr.com/photos/54480415@N08/50624936826/
This is unusual for a bridge over a freeway to be supported by a precast span and the approach the conventional method.
Are you referring to any mixed beam type bridges? If so, 50th St over I-235 (https://goo.gl/maps/KGm16nynhq5dmkZJA) does the reverse, with precast beams on the approach and metal beams over the freeway.
There are also 2 examples at the junction of OK-75 and the Kilpatrick Turnpike. (https://goo.gl/maps/uDBMDXehrFNwCQyy9)
Looking around for examples has actually given quite a few examples, so this type of arrangement seems pretty common.
Quote from: roadman65 on November 21, 2020, 09:18:33 AM
https://www.flickr.com/photos/54480415@N08/50624936826/
This is unusual for a bridge over a freeway to be supported by a precast span and the approach the conventional method.
No big deal. There's a cast-in-place box beam where unusually long spans are required due to a severe skew angle, and AASHTO beams everywhere else.
Here's another way of dealing with the problem of spans too long for AASHTO beams: click me (https://www.google.com/maps/@21.372528,-157.9251699,3a,72.1y,2.76h,98.96t/data=!3m6!1e1!3m4!1sdZWQ7RDeJXiJU35Ay1VP5g!2e0!7i16384!8i8192)
Quote from: Tom958 on November 22, 2020, 01:05:31 AM
Here's another way of dealing with the problem of spans too long for AASHTO beams: click me (https://www.google.com/maps/@21.372528,-157.9251699,3a,72.1y,2.76h,98.96t/data=!3m6!1e1!3m4!1sdZWQ7RDeJXiJU35Ay1VP5g!2e0!7i16384!8i8192)
I see your weird peir cap that looks ugly but also makes standard beam lengths possible over this span, and give you this monstrosity. (https://goo.gl/maps/aEnZEX1EH5yxaTew9) it might have been cheaper to just build a really wide perpendicular bridge with the road only using part of the deck, like thjs. (https://goo.gl/maps/S6YHgp39cNfYBSa28)
Quote from: MCRoads on November 30, 2020, 01:58:22 AMit might have been cheaper to just build a really wide perpendicular bridge with the road only using part of the deck, like thjs. (https://goo.gl/maps/S6YHgp39cNfYBSa28)
I prefer the deck to be left open, like this (https://www.google.com/maps/@33.8512088,-84.3693611,3a,75y,338.98h,92.18t/data=!3m6!1e1!3m4!1s2xg-mVyHUvancHemceV7fw!2e0!7i16384!8i8192). These are called
pergolas.