Topic: What do you want for $10 billion? Bay Bridge falling apart.
Posted by .
Unregistered


Rust, cracks found on Bay Bridge tower rod

Tests on a steel anchor rod removed from the Bay Bridge eastern span’s tower after being inadvertently submerged in water for years revealed rust and tiny cracks, bridge officials said Friday — a potentially worrisome sign for the long-term viability of the span.

The 25-foot-long rod is one of more than 400 galvanized-steel fasteners that became soaked in water because they sat in holes at the tower’s foundation that were poorly grouted. They cannot be removed without being destroyed, and there is not enough room to maneuver replacement rods into position — so any evidence that the water has damaged the rods presents Caltrans with what could be an unsolvable dilemma.
“We did see some evidence of damage on the surface,” Caltrans bridge engineer Brian Maroney said at a news conference in Oakland, where officials announced the results of preliminary tests on the removed rod.
It’s the latest in a series of construction problems on the $6.4 billion bridge, and potentially one of the most serious. Other steel rods that stewed in rainwater for several years snapped when they were tightened in 2013 on seismic-stability structures on the bridge, but Caltrans was able to engineer a replacement for them.

There is no obvious work-around for the rods that anchor the 525-foot tower to its foundation. They were essentially fixed in place when the tower was lowered atop them during construction in 2010.

Maroney said that even if other rods that remain at the tower base are cracked and rusted, it is “not a safety issue.” He said even if many of the rods failed in a large earthquake, it would simply result in the tower suffering extra damage — but not catastrophic failure.
He has not yet decided what can be done to reduce the risk to the tower rods until he sees more test results. “I want to know what I’ve got down that hole to make a good decision,” Maroney said. “We’re still in the process of the science.”


Posted by .
Unregistered


http://www.sfgate.com/bayarea/article/Rust-cracks-found-on-Bay-Bridge-tower-rod-6092734.php



Corrosion risk

Caltrans inspectors discovered the tower-rod problem last fall. The rods are galvanized, or coated in zinc, to guard against rust. The galvanization can make metal more vulnerable to another form of corrosion — hydrogen-induced cracking.
Maroney said the tests showed the galvanizing layer was gone on parts of the rod, an indication that hydrogen may have invaded the metal.
That was how 32 galvanized rods failed on seismic-stability structures on the bridge in March 2013. Bridge officials have downplayed that risk on the tower rods, saying they were under less tension, a key factor in causing sudden failure.
Two independent experts, however, said the rods are at risk of failing even at the lower levels of stress, because tiny cracks like those found on the tested rod can get worse over time.
“If it started, it will grow. It will continue to grow until reaching a critical size — then, bang,” said Yun Chung, a retired Bechtel engineer and expert on steel fasteners who has been critical of Caltrans.
Lisa Fulton, a metallurgical engineer and materials scientist who specializes in corrosion, said the discovery of rust and tiny cracks is alarming.
“This is bad news,” Fulton said. “It means other rods surely have cracks in them. We don’t know when those rods are going to snap.”
Fulton said the loss of the zinc galvanization coating is telltale evidence of the electrochemical reaction that drives hydrogen from standing water into high-strength steel. The presence of hydrogen can make the steel vulnerable to failing like the rods that failed in 2013 on the span.
Not to specifications
The tower rods sat in water because the main bridge contractor, a joint venture called American Bridge/Fluor, did not follow the contract specifications that the sleeves surrounding them be filled with moisture-resistant grout, Caltrans officials have said.
Many of the rods sat in only a few inches of moisture, but 60 or so were completely submerged in water that got into the tower during storms and power-washings, Caltrans said. Engineers cut apart and removed two of those for testing.
The first rod was tested for its material properties, not for cracking. The second rod removed and tested recently showed rust and cracking.


Posted by .
Unregistered


bring in some diverse trans-accepting minority engineers to fix this.


Posted by .
Unregistered


Shitheads. They built better and sturdier bridges in the 1930s.

But America ain't what it used to be.


Posted by Original_Lonley_Guy_
Moderator


Get out of my city. Final warning.


Posted by .
Unregistered


Original_Lonley_Guy_ said: Get out of my city. Final warning.

­You should be ashamed to be in such a corrupt shithole full of incompetent people.


Posted by .
Unregistered


Its a bridge to Oakland.


What's the problem?


Posted by .
Unregistered


We do for you, low price.
\
:chinaman:


Posted by .
Unregistered


. said: Its a bridge to Oakland.


What's the problem?

:lol:


Posted by .
Unregistered


Old bridge made out of USA steel. New bridge make out of China junk steel. Nice going liberal California, butt fucked again! One good quake and that bridge is going down.


Posted by .
Unregistered


. said: Old bridge made out of USA steel. New bridge make out of China junk steel. Nice going liberal California, butt fucked again! One good quake and that bridge is going down.

TRY POST AGAIN, BUT THIS TIME USE ENGLISH, CHINKY.


Posted by .
Unregistered


Substantially complete.
\
:spanky:


Posted by .
Unregistered


Ten billion for what, an over priced piece of shit.


Posted by .
Unregistered


. said: Ten billion for what, an over priced piece of shit.

Millions of dollars spent on failed bird rehabitation project to lure birds from the old bridge onto the new one. :lol:


Posted by .
Unregistered


. said:
. said: ten billion for what, an over priced piece of shit.

millions of dollars spent on failed bird rehabitation project to lure birds from the old bridge onto the new one. :lol:

holy shit, not a troll:

http://sanfrancisco.cbslocal.com/2013/02/27/caltrans-trying-to-lure-nesting-birds-to-new-bay-bridge/

caltrans saw the problem coming, and has spent about a half a million dollars building small platforms into the new span.

they are being called cormorant condos, designed as a place where the birds can make a new home. but birds of a feather are apparently picky about where they flock together.

“we haven’t observed any birds moving over yet,” said galvez-abadia.

last year, caltrans started wooing the birds, first with fake nets, then with decoys.

“we did not have any birds moving over,” said lauren bingham, the caltrans biologist heading up the relocation project. “we had to get creative.”

caltrans has now installed spreakers beneath the bridge to blast the mating call of the cormorant, hoping that will convince them to make the switch.


Posted by .
Unregistered


This incompetency is the reason why California is broke.


Posted by .
Unregistered


. said: This incompetency is the reason why California is broke.
\
:winner:

­
Check again, loser. CA is the largest economy in the US.


Posted by .
Unregistered


Anyone remember when the toll was going back to $1 when it was finished? :lol:


Posted by .
Unregistered


. said: Anyone remember when the toll was going back to $1 when it was finished? :lol:

Huh? :link:


Posted by .
Unregistered


. said:
Huh? :link:

Emperor Norton said so you shit!


Posted by .
Unregistered


. said:
­
Check again, loser. CA is the largest economy in the US.

Hey asshole California is in debt up to it's ears, I know I live in California.


Posted by .
Unregistered


But in 2010, the bridge’s main contractor, the joint venture American Bridge/Fluor, asked Caltrans if it could scrap the plates and fill in the holes that had already been drilled to attach them to the deck. The change would save time and money on a project already dogged by delays and cost overruns. In 2011, Caltrans agreed to the change.

“It’s too bad some people at Caltrans don’t or didn’t own sailboats in the bay,” said Bob Bea, a civil engineering professor emeritus at UC Berkeley who has studied what goes wrong on infrastructure projects. “What I’ve learned after 15 years with that boat is, if it can leak, it will leak.”
Bill Casey, the resident engineer on the project, told The Chronicle that one advantage with doing away with the backup plates was that fewer holes would be drilled in the deck, meaning there would be fewer places for the span to leak.
The problem, he said, was that Caltrans failed to make sure the guardrails were thoroughly sealed to make up for the absence of the plates. “We just weren’t complete,” he said.
Signs of corrosion
The decision and lack of follow-through proved disastrous after the bridge opened. Rainwater poured through the gap at the base of the guardrails and down into the holes where the barriers are attached to the road deck, into the cavernous steel support structures that are supposed to be watertight.
Experts who have reviewed photographs and other evidence say there are signs of corrosion in the chambers where, among other things, the main cable for the suspension span is anchored. Photos also show apparent corrosion in pools of water under the deck.
Caltrans officials have denied there is any active corrosion on the span, saying the brown sludge and white powdery residue shown in photos are signs of corrosion on steel shavings left behind from construction.
Early last year, after The Chronicle reported that leaks on the span posed a corrosion danger, Caltrans officials promised to get to the bottom of what happened.
In an April 2014 accounting, Caltrans said only that its decision to abandon the drainage plates was part of a package of measures to “simplify fabrication and erection work.”


Posted by .
Unregistered


This is a perfect example of how public unions are choking progress and wasting taxpayer money.

Rank incompetence, complete lack of oversight, and an incredible price tag.


Posted by .
Unregistered


. said: This is a perfect example of how public unions are choking progress and wasting taxpayer money.

Rank incompetence, complete lack of oversight, and an incredible price tag.

­The unions did the work the management and the engineers told them to.


Posted by .
Unregistered


. said: Its a bridge to Oakland.


What's the problem?

Dat's raciss!
\
:antwon:



Quick Reply
Moniker:
 

Registration Required

Thank you for your vote!

But in order to make it count, you must be a registered user.

Log In | Register | Close