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Mother Nature still has things to teach us.
"several weeks after officials made public a summary finding that it had not been designed for the cables to withstand wind-induced vibrations." ---- The previous public statement did not say this at all. It was inferred by reporters that clearly aren't engineers and don't know what they are talking about.
What does it mean that the review decided that the design was "structurally adequate" if it's falling down after four years due to not being engineered for the wind (who could have known Hiawatha was a wind corridor)? Did they plan for it to last only a few years?
I'm wondering when they'll mention that shortly before the cables broke, there was a police car, ambulance and fire vehicle parked on a "bike" bridge.
WOW, I had no idea the Sabo bike bridge and I had so much in common! I too consider myself "structurally adequate" but do experience a bit of "poor fatigue resistance" - especially late in a work week or just after mowing the lawn. Who knew?
"welded details that offer poor fatigue resistance" and this bridge is only a few years old. Bad design, bad engineering, shame.
"Sabo bike bridge plates had 'poor fatigue resistance" So, not thick enough?
This story is classic doublespeak. The report states that the bridge is "structurally adequate" but -
-"Some plates need retrofitting."
-it has "poor fatigue resistance"
-"effects of wind-induced cable vibrations were not included in the original design calculations package."
I wonder if inflation is responsible for today's adequacy being worth so much less than adequacy was 30 or 40 years ago. The engineers need to inflation adjust their adequacy.
How about building bridges from now on that are less for the form and more for the function. We seem to be the town where bridges collapse.
Why is there even a bridge? It's 2200 feet long, nearly 1/2 mile up and down a good grade. why take the bridge when you could cross Hiawatha at the stop light? They've spent over $500,000 in analyzing the failure just to find out "it was the wind".
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Updated Aug. 22, 2011
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