Which risk dramatically increases when timber bridges' joints degrade?

💡 Explanation

Resonance-induced structural collapse risk rises because material loss at joints lowers the Eigen frequency of resonance frequencies, causing vibration to amplify significantly. Therefore, catastrophic failure occurs when crossing speed matches weakened structure frequency, rather than typical compression/shear failures that require extreme loading.

• Which risk becomes more prominent during bronze casting when the crucible overheats?
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• Which consequence resulted from thermal expansion in early sextant instruments?
• Which structural risk was amplified in 18th-century warships due to iron bolt corrosion in timber planking?
• Which consequence arose from decreased quality control during Byzantine silk (sericulture) production?
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