PrntRhd
join:2004-11-03
Fairfield, CA
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2 edits | reply to sashwa
Re: Bay Bridge cable .....
CalTrans spokesman says the cables are actually tensioning rods that took the load off the cracked section of eyebar and they claim "vibration" from the wind caused one of the 4 rods to fail and took out the other two parts connected to it. Their fix is to replace all 4 rods and tie the parts so they won't fall if they break.
See "Caltrans Won't Talk Reopening" link from Sashwa's first link. |
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bobrk
You kids get offa my lawn
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join:2000-02-02
San Jose, CA | You say "vibration from the wind" like it's nothing.
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bobrk |
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dose
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join:2000-10-09
A-town
| reply to sashwa
I feel bad for my girlfriend who has to commute to work. She spent about 4 hours in the car yesterday 
»511.org/baybridge/default.asp
Looks like it will be closed at least all day today as well.
I thought I left all my commuting woes back home in Boston with the Big Dig!
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PrntRhd
join:2004-11-03
Fairfield, CA
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| reply to bobrk
said by bobrk  :You say "vibration from the wind" like it's nothing. I am not trying to be cruel to engineers. Nature is cruel to engineers who underestimate or ignore natural forces.
Side to side movement of a beam or an entire bridge span is also a very low frequency "vibration". Like this famous example:
»www.youtube.com/watch?v=3mclp9QmCGs
Bridges do move with traffic loads, thermal cycles, wind loading etc, and structural engineers must engineer their designs to accommodate those forces, otherwise the structures will fail. |
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bobrk
You kids get offa my lawn
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join:2000-02-02
San Jose, CA | Yep, I'm a mechanical engineer... |
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GemSnake
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join:2000-10-19
3rd layer
clubs:  | reply to PrntRhd
I got dizzy watching that video... |
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Gbcue
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| reply to PrntRhd
said by PrntRhd :CalTrans spokesman says the cables are actually tensioning rods that took the load off the cracked section of eyebar and they claim "vibration" from the wind caused one of the 4 rods to fail and took out the other two parts connected to it. Their fix is to replace all 4 rods and tie the parts so they won't fall if they break. See "Caltrans Won't Talk Reopening" link from Sashwa's first link. The vibration can cause the cable to resonate.
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bobrk
You kids get offa my lawn
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San Jose, CA
 ·SONIC.NET
| said by Gbcue :said by PrntRhd :CalTrans spokesman says the cables are actually tensioning rods that took the load off the cracked section of eyebar and they claim "vibration" from the wind caused one of the 4 rods to fail and took out the other two parts connected to it. Their fix is to replace all 4 rods and tie the parts so they won't fall if they break. See "Caltrans Won't Talk Reopening" link from Sashwa's first link. The vibration can cause the cable to resonate. Fatigue is probably a bigger problem.
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bobrk |
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PrntRhd
join:2004-11-03
Fairfield, CA
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| They say the original eyebar crack did not get worse after the patch failure, and that is some good news.
The latest update is that they plan to have the tension rods and modifications installed and testing done tonight.
They are installing strain gauges on the rods this time to see what is going on with the loads on the rods.
They are using rounded nuts on the rods to keep the rods centered in the plates vs the flat ones used on the failed installation.
They are asking commuters to plan on the bridge being closed but may open it in the morning if the patch tests ok and if third party inspectors and engineers give their approval. |
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PrntRhd
join:2004-11-03
Fairfield, CA | reply to sashwa
And they still are not done with the installation, CalTrans says they have to align the rods and other parts better. |
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sashwa
Pixie Cat Crunchin' n Foldin'
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join:2001-01-29
Alcatraz
clubs: | You think the bridge will be open for the Monday commute? |
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PrntRhd
join:2004-11-03
Fairfield, CA | Possibly, they still have not tensioned the rods and have not had the promised third party inspection. |
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PrntRhd
join:2004-11-03
Fairfield, CA | reply to sashwa
And now they say it will be closed all weekend with a goal of opening Monday. |
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Gbcue
E.I.T.
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Santa Rosa, CA
clubs: | »blogs.sfweekly.com/thesnitch/200···il_w.php |
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PrntRhd
join:2004-11-03
Fairfield, CA | More funny stuff.
"we knew there were issues with the rods moving when we did the weekly inspections-except for one weekend that we didn't, and we were already designing enhancements when it broke." |
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GemSnake
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3rd layer
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| reply to sashwa
Caltrans gets a point for being honest.
There is no good answer to when the Bay Bridge will reopen - Caltrans simply does not know for sure.
This morning, officials reiterated that there is a good chance that Monday morning commuters will have to struggle yet again with packed BART trains and sluggish traffic due to the days-long closure of the Bay Bridge. »www.sfgate.com/cgi-bin/article.c···VXYORsPY
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sashwa
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| reply to sashwa
Bridge will not be open for the morning comute. They said it failed a test on the evening news. 
»cbs5.com/local/bay.bridge.closur···519.html |
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shinjuru
Premium,Mod
join:2000-10-29
California | reply to sashwa
Crazy. I wonder what the effects on the entire bay area, in terms of financial costs, is going to be. |
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PrntRhd
join:2004-11-03
Fairfield, CA
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| reply to sashwa
So much for visiting a Brisbane problem account on time tomorrow AM. I will have to go via Golden Gate Bridge. I expect the trip will be 2.5 hours or more.
This type of problem with the repair is what I was noting when this first occurred, they may find the repair is not going to work and would have to have an eyebar fabricated. And they just voted for another dollar added to the toll, this is not even humorous. |
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sashwa
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1 edit | »www.ktvu.com/index.html
»www.ktvu.com/news/21444672/detail.html
Bay Bridge should be re-opened between 8:45 and 9:00 am this morning. |
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