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Gut feeling

As a very old retired engineer who worked with slide rule, pencil and paper, I was taught to look at what I had designed to see whether it looked right.

Those hangar connections on the Clyde Arc bridge simply don't look right. They look flimsy and not capable of doing the job.

The cost of the connections in relation to the whole structure must have been peanuts. Why then were they not beefed up until they looked right?

The combination of static load, bridge dynamic loads, wind loads and temperature change loads in such a mobile structure must have led to some interesting, and probably ultimately indeterminate, worst cases at the individual cable connections.

Accordingly we would have designed in a massive safety factor. I see no safety factor in those skinny, single pin, two lug connections.

MICHAEL ROWAN (M), michael@realflame.co.uk

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