If you suspend a bridge, you build the bracing one way.
If support a bridge from below, you brace it a different way.
All the stresses are totally different depending upon where you 'hang' it from.
So, they designed it to hang from cables above, so that was the strong design of the bridge.
Someone with a big ego got it pushed through the idea of supporting it from below, first on big moving jacks (a whole 'bother set of stress to be moving to design for), and then from different points below from the ends and middle.
But a hanging bridge is very, very weak from below, those stresses had to be about impossible to calculate on the type of design this hanging bridge was. The ends and middle want to sag out and down from the load bearing points that are not properly beefed up, and from that backbone of supports that are angled the wrong way now when you try to carry it from -below-. Everything is opposite and backwards when you try to support it from below.
Bet there are some lowly engineers will be found eventually that were saying this won't work, it's not designed for those types of pressures, but were bypassed......
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