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Which structural failure increases in ancient Inca rope bridges when subjected to prolonged cyclical loading?

A)Rope fiber fatigue weakening
B)Anchor stone creep deformation
C)Decking plank shear fracture
D)Supporting tower tilting instability

💡 Explanation

Rope bridges suffer rope fiber fatigue weakening because prolonged, repeated stress cycles induce microcrack propagation, therefore progressive structural degradation leads to eventual failure, rather than instantaneous fracturing, which would require higher stress.

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