simple harmonic oscillation with damping

The impacted bridge was considered to do simple harmonic oscillation with damping after impact. Some new concepts,such as equivalent amplitude,equivalent coefficient of elasticity,etc. were put forward.
認爲橋梁在受到撞擊後做阻尼簡諧振動,提出了如等傚振幅、等傚彈性系數等概唸。