Must be designed so that the bridge's natural vibration frequency is equal to the frequency of wind affected the same bridge, a bridge in ruins, which must test equity Tigers vibration vibration of bridge before.
The bridge is designed to be equal to the natural frequency of the oscillation frequency of the wind on the bridge, which is equal to the bridge collapse, which will be tested for vibration Tiger's first suspension bridge.
Designed to bridge the natural frequency of vibration is not equal to the frequency of wind that blows the impact สะพานซึ่ง if equal that of bridge damage which need to test the vibration of the vibration of the bridge and the tiger.