You can test with worst-case loads: faster than operating speeds, loaded with additional weight beyond normal operating loads, to see if anything fails.
With regard to the design, these kinds of structural mechanics are very well known and characterized, like with bridges and other buildings. Most, if not all, structural failures stem from someone skirting recommended practices; not built to specification/subpar materials used, irregular/incomplete maintenance, operating outside safe conditions, operating longer than its life-expectancy, etc.
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