Skip to comments.Experts raise new doubts about essential Bay Bridge rods
Posted on 12/08/2013 12:37:55 AM PST by Cincinatus' Wife
Yun Chung, a retired engineer and metallurgist, read the official report explaining why massive, high-strength steel rods on the new San Francisco-Oakland Bay Bridge broke last March and was stunned then alarmed.
At first glance, Chung said about the July report, he saw obvious errors some typographical, others that confused basic terminology. Digging deeper, he discovered more important problems. He concluded that the analysis defied metallurgical science and common sense.
I think its very shameful that in this public document, this important (oversight) report, there are so many errors. (I have) a sense of outrage, Chung said in an interview last week.
Chung said he couldnt understand how the oversight group, its consultants, and even a review team from the Federal Highway Administration missed such an obvious conclusion: Over five years, water corroded the bottoms of the rods where all 32 breaks occurred. That was the primary reason they snapped when tightened. Corrosion introduced too much hydrogen into the steel at those locations.
Underplaying the environmental cause for the breaks the most fundamental error in the (oversight) report Chung and Thomas wrote, led to apparent complacency among oversight officials about future corrosion from the bays marine conditions.
As a precaution against corrosion, giant rods on the suspension spans eastern anchorage and others at the top and base of the tower are housed inside a watertight, dehumidified chamber so moisture is not readily present, according to the oversight groups report.
Chung and Thomas said that in the bays marine air, the chambers must be more than watertight they should be airtight to prevent corrosion. Pizzo agreed that airtight chambers would be necessary...
(Excerpt) Read more at sacbee.com ...
Gues he never heard of “Affirmative Action Hiring”....
Well if they fix the problems but don’t really “fix” the problems there are still problems and they get to keep on “fixing” them with money from the people and it keeps the union people working FOREVER.
OOoooh. Like the Obamacare website? Taxpayers really do get the shaft— hard.
you mean kind of like FDRs program of “You guys dig a hole here and dump it over there, then the 2nd shift moves it back into the hole.”
Rinse and repeat
I think I recall there being a big to-do about this bridge having been pre-fabricated in China.
“When it was built in 1936, the San Francisco-Oakland Bay Bridge was a Depression-era project that put scores of Americans to work. When its $6.3 billion replacement opens in two years, it will be an international affair from the bottom up, an example of massive outsourcing that has drawn both praise and criticism.
Half a dozen countries contributed expertise or materials, none more so than China.
“China was immensely helpful to getting this project built,” says California Department of Transportation spokesman Bart Ney. “They were able to turn the steel around and work directly with our own inspectors to make sure we met the specifications of what this bridge required.”
Several thousand Chinese workers spent five years fabricating the steel used to construct the roadbeds, cable strands, and landmark tower for the single anchor suspension bridge set to open in 2013.
But the project is sparking outrage among groups who argue the work should have stayed here.
Huge deck segments were shipped overseas from Shanghai, contributing to pollution, say critics, and delivering another blow to California’s battered economy and 12 % unemployment rate.”.................
FR-er Metallurgical wonks please respond, is this a form of "Hydrogen Embrittlement"?
Here in Seattle they just tore down a 13-story skyscraper. It was built about 10 years ago. They started having corrosion in the pre-tensioned wires. They were supposed to have a dab of epoxy on the ends. The guy didn’t do his job. And managers, inspectors, etc. didn’t do their jobs. They spent millions trying to fix the problem to no avail.
Funny thing is, it was built by the carpenter’s union FOR the carpenter’s union. To be a source of income for their pensions.
I’m guessing it will be a tad more expensive to tear down the bridge and start from scratch.
“....Replacement of the rods, which are embedded in the foundation, would be difficult if not impossible. My concern with the (tower) anchor rods is that theres no redundancy, Chung said. Once they break, theres nothing you can do.
Chung and Thomas also identified unexplained hardness profiles in many rods, including those at the main cable eastern anchorage and those anchoring the tower. Contrary to normal expectations, some of the rods are harder internally than at their edges....”
Yet, every day, on web forums just like this one, the outcry against grammar and spelling "Nazis" continues afresh. It all "counts," despite the cries from the tablet- and smartphone-enhanced thumbtypists, just like that stick-in-the-mud, behind-the-times teacher tried to tell many of us when swimming against the technology tide.
Policy should be....Read what is intended, if you need clarification between their , there and they’re ask it , move on, don’t be a smug grammatical a hole.
Not a comment on the concerns or article, but I used to work a lot with metallurgists, and once one told me if you want three opinions on on why something failed or corroded just hire two metallurgists. In short often failure is not always derived exactly.
You forgot “Well, you know what I meant.”
I’m feeling a bit of schadenfreude for the carpenters union there.
Is the author of the report a "smug grammatical a-hole" or just an engineer with a justifiable concern about people dying?
I wonder how many kick-backs there given and received up and down the chain of command.
It’s a slow-motion disaster - unstoppable (sort of like Obamacare - though that fraud is moving somewhat faster).
Heads should roll.
The company I work for profitted handsomely off the band aid “fix” for this project. Seems we put in a bid and were turned down for some of the original work, So when Caltrans discovered their lowest “Chinese” bidder gave them junk they came back to us for the fix. Rumour has it the owner broke it off in their backside.
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