It looks like that Beipanjiang bridge is built like this (top view).
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Notice how only one side of each white pillar block is touching the load of the bridge in red. A small adjustment will yield much more support under 7DtD’s deliberately simplified calculations.
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Now the white pillar blocks are touching the load on the north and south faces too. Each face can bear its own load, so this is much more stable.
If you don’t like the pillars encroaching on the width of the bridge deck, simply stop building up once the pillars get that high. Anything above the bridge deck is superfluous for SI, so leave it as part of the flush top surface. Your bridge will look different from the real one, but you’ll build it more efficiently with fewer pillars needed. Th...
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