From Kimball Olson, made with Sketchup..
David sent me a link to the busted bolted on the Bay Bridge, oops! (Thanks David!)
Bay Bridge big bolts busting badly – say that five times..
At least 30 of the giant bolts that hold together the new, $6.4 billion eastern span of the Bay Bridge have snapped.
Toll Bridge Program Manager Tony Anziano said engineers are “pretty confident” the problem with the bolts is not a design issue or a construction problem but related to the quality of the steel bolts themselves.
Ya know going off subject here, why is a toll road an acceptable way to fund a project, where the people who are using the structure are paying for it. But for accelerated bridges the users of the bridge are given fast construction so they are not inconvenienced? Meaning you and I pay to help out local users of a structure?
I hate toll roads but I also feel a little inconvenience now is the price you pay for lots of convenience in the future.
Do you ever surf Monster.com after a difficult week…..
I saw this article, Beware of Back-Stabbing Coworkers.
Think you’ve been stabbed in the back at work? If so, you’re not alone.
In a 2008 national survey by The Creative Group, half of advertising and marketing executives responded that a current or former colleague had tried to make them look bad on the job.
In addition, professionals of all types say they had suffered from sabotage on the job. In an online poll asking, “Are you aware of a coworker trying to make you look bad or sabotage your work in the last year?” nearly three-quarters said yes.
Sorry, I am dead busy..but this is a good article.
Murray Johnson, a 55-year-old civil engineer from Vancouver, British Columbia, has designed, repaired, inspected or demolished more than 150 bridges. But he’s best known for sliding them.
When a deteriorating truss bridge—made of linear elements connected in triangles—must be replaced, Mr. Johnson figures out how to move it out of the way or slide a new one into its footprint. He engineers the plan that will send thousands of tons of steel gliding sideways over a river with the poise of a tightrope walker.
Although truss-sliding isn’t new, Mr. Johnson has elevated what he calls “extreme bridge engineering” to an art form. It’s one that saves municipalities plagued by decaying infrastructure millions of dollars, while limiting bridge closures—and commuter headaches.
I am teaching a few classes in construction management, one of the topics is scope growth of a project. This video says it all.
The website www.economist.com has a good overview of the problems facing the new Columbia river crossing.
Talk of a “green-tea party” uniting environmentalist and conservative critics may be premature. But foes share the belief that a better design can emerge if the current plan is ditched. What it would look like is another question. Some want to raise the bridge’s height to ensure access to upstream businesses; others are obsessed with killing light rail; others urge inaction until the effect of tolls on traffic is known. For their part, the CRC’s backers barely hide their frustration with arguments they consider weighed and rejected. Each year of delay, they say, adds $50m-70m to costs.
A great post on the blog Parisian Fields about the early age of suspension bridges in Paris. (Thanks for the link David!)
In the first half of the nineteenth century, France was a world leader in the design and construction of suspension bridges. And yet today not a single one of Paris’s nineteenth-century suspension bridges over the Seine remains. Why?
Suspension bridges were known to oscillate in the wind and failures were not unknown, but on April 16, 1850, the unthinkable happened. It seems it was a stormy day and the bridge was oscillating.
This would not have been regarded as unusual as 478 marching soldiers approached the bridge.
But as they crossed, an anchorage tore loose and the deck disappeared beneath their feet; 226 soldiers fell to their deaths. It was the deadliest bridge collapse in history.