Final answer:
Bridges are built with structural integrity to withstand loads and environment, yet unchecked vibrations can lead to failures like the Tacoma Narrows Bridge. Regular maintenance, including managing corrosion, is crucial to preventing structural failure.
Step-by-step explanation:
Most bridges are designed with enough structural integrity to support them; however, if left unchecked, the vibration from various sources can lead to resonant frequency oscillations, eventually leading to structural failure. This was the case with the Tacoma Narrows Bridge collapse in 1940, where heavy crosswinds induced oscillations at the structure's resonant frequency. Maintenance is crucial to prevent such failures, as illustrated by the need for regular inspections and repairs due to issues such as corrosion, highlighted by the Silver Bridge collapse in 1967.