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Superstructures

From the Economist:

Adding sensors and other devices to bridges, tunnels and buildings can turn them into “smart structures” capable of sensing and, in some cases, even responding to problems.

ON AUGUST 1st 2007, as commuters were driving home from work on the I-35W Mississippi River Bridge near Minneapolis, it abruptly collapsed. Thirteen people died and over a hundred were injured. The bridge had opened in 1967 and had not been scheduled for replacement until 2020. What had gone wrong? In 2008 the National Transport Safety Board concluded that extra concrete, which had been added to the bridge over the years as the level of traffic increased, had helped cause the collapse. After an inspection in 2005 engineers had classified the bridge as “structurally deficient”, and repairs were planned. But many other bridges in the area were thought to be in an even worse condition, so the work was not prioritised, and the true state of the bridge became apparent only when it failed, with tragic results.

Such catastrophes are rare, but the Mississippi River Bridge highlights a wider problem: old infrastructure is often exposed to much greater loads than it was originally designed for. British trains routinely run on arched bridges dating back to the Victorian era, for example. Old structures can be rebuilt or reinforced, of course, but the standard approach to assessing their condition is regular inspections, and these may not be frequent or detailed enough to spot problems.

More info here.