In general the whole point of bridge design is to make it as light as possible.
ANY bridge with two main supports will fail if one of them is destroyed.
The bridge failed as expected rotating around their support bearings and the trusses failing at the high stress points.
The right-hand bearing in particular showed behaviour exactly as expected.
What would SEEM to be the major design fault is the relatively small size of the islands/caissons. These had neither the mass, nor the width/length to stop such a major vessel.
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