Which risk increased when medieval pontoon bridges used unseasoned timber?

💡 Explanation

Unseasoned timber is prone to creep because it retains high moisture content and undergoes slow, plastic deformation under sustained load. Therefore, deformation becomes a problem, rather than frequency changes which are secondary with this specific timber's elasticity reduction.

• Which outcome occurs when Roman mining techniques undermine a fort during a siege?
• Which risk markedly increases in the Chinampa agricultural system if the water table drops significantly during annual cultivation cycles?
• Which outcome results from mortar carbonation within Roman concrete?
• Which maintenance outcome was necessitated by the high static load in a medieval stone siege engine’s (trebuchet) frame?
• Which consequence occurred when the Byzantine silk industry attempted total control over available dyestuffs?
• Which obstacle became significant during Aztec chinampa expansion?