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Which construction issue results when supporting pillar settlement caused medieval rope bridges’ increased swaying?

A)Decking plank shear failure
B)Cable catenary geometric instability
C)Anchorage slippage propagation effect
D)Sag-induced over-tensioning feedback loop

💡 Explanation

Catenary geometric instability causes extra rope swaying, because uneven pillar drops steepen the cable angles causing unbalanced forces and deformations. Therefore, the swaying get worse; rather than bridge collapse from exceeding tensile strength as tension remains within set limits.

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