Thousands of US Bridges Could Be On Verge of Collapse

 

We hear over and over again from Republicans that they seek to starve and shrink government and relentlessly lower taxes.   The result, of course, is that many critical needs and services go without proper funding.  In addition to throwing the poor and needy to the curb, this policy of spending less is taking a severe tool on the nation's infrastructure some of which could be a minor collision away from collapse.  American bridges are among the ticking time bombs that this failed GOP policy has set in motion.  George W. Bush and Emperor Palpatine Cheney and their GOP accomplices in Congress cause the USA to squander billions of dollars in Iraq and Afghanistan.  Meanwhile our infrastructure at home is crumbling.  Talk about misplaced priorities.  A piece in the Virginian Pilot looks at some of the dangers that could have deadly consequences with little or no notice.  Here are excerpts:

Thousands of bridges around the U.S. may be one freak accident or mistake away from collapse, even if the spans are deemed structurally sound.

The crossings are kept standing by engineering design, not supported with brute strength or redundant protections like their more modern counterparts. Bridge regulators call the more risky spans "fracture critical," meaning that if a single, vital component of the bridge is compromised, it can crumple.

Those vulnerable crossing carry millions of drivers every day. In Boston, a six-lane highway 1A near Logan airport includes a "fracture critical" bridge over Bennington Street. In northern Chicago, an I-90 pass that goes over Ashland Avenue is in the same category. An I-880 bridge over 5th Avenue in Oakland, Calif., is also on the list.

Also in that category is the Interstate 5 bridge over the Skagit River north of Seattle, which collapsed into the water days ago after officials say an oversized truck load clipped the steel truss.

Public officials have focused in recent years on the desperate need for money to repair thousands of bridges deemed structurally deficient, which typically means a major portion of the bridge is in poor condition or worse. But the bridge that collapsed Thursday is not in that deficient category, highlighting another major problem with the nation's infrastructure. . . .

The most famous failure of a fracture critical bridge was the collapse of the I-35W bridge in Minneapolis during rush hour on Aug. 1, 2007, killing 13 people and injuring more than 100 others. The National Transportation Safety Board concluded that the cause of the collapse was an error by the bridge's designers - a gusset plate, a key component of the bridge, was too thin. The plate was only half of the required one-inch thickness.

Because the bridge's key structures lacked redundancy, where if one piece fails, there is another piece to prevent the bridge from falling, when the gusset plate broke, much of the bridge collapsed.

Fracture critical bridges, like the I-5 span in Washington, are the result of Congress trying to cut corners to save money rather than a lack of engineering know-how, said Barry B. LePatner, a New York real estate attorney and author of "Too Big to Fall: America's Failing Infrastructure and the Way Forward."

About 18,000 fracture critical bridges were built from the mid-1950s through the late 1970s in an effort to complete the nation's interstate highway system, which was launched under President Dwight Eisenhower, LePatner said in an interview. The fracture critical bridge designs were cheaper than bridges designed with redundancy, he said.

Thousands of those bridges remain in use, according to an AP analysis.   "They have been left hanging with little maintenance for four decades now," he said. "There is little political will and less political leadership to commit the tens of billions of dollars needed" to fix them.

There are 66,749 structurally deficient bridges and 84,748 functionally obsolete bridges in the U.S., including Puerto Rico, according to the Federal Highway Administration. That's about a quarter of the 607,000 total bridges nationally. States and cities have been whittling down that backlog, but slowly. In 2002, about 30 percent of bridges fell into one of those two categories.

There is wide recognition at all levels of government that the failure to address aging infrastructure will likely undermine safety and hinder economic growth. But there is no consensus on how to pay for improvements. The federal Highway Trust Fund, which provides construction aid to states, is forecast to go broke next year. The fund gets its revenue primarily from federal gas and diesel taxes. But revenues aren't keeping up because people are driving less and there are more fuel-efficient cars on the road.

The GOP's "starve government"policy - triggered by Tea Party and the 1% greed -  is creating life threatening dangers yet morons in the GOP base just keep eating up the anti-tax demagoguery.