Which structural risk increased with the construction of longer steel suspension bridges in the late 19th century?

💡 Explanation

With longer spans, the natural frequency of steel suspension bridges decreased, increasing susceptibility to wind-induced resonance because lower frequencies are more easily excited. Therefore, tower collapse from wind resonance risk increased, rather than corrosion, buckling, or liquefaction which are influenced by material properties, temperature gradients and soil conditions, respectively.

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