高架道路交通荷载对环境影响的功率谱方法

Power spectral density method for impact evaluation of viaduct traffic in surrounding environment

从功率谱的角度介绍城市高架桥梁在交通荷载下产生振动的机理和振动的传递过程.考虑到振动在土体中传播的特性,假定桥墩为固接在地面上的弹簧阻尼系统,即假定桥墩处为系统施加在地面的一简谐荷载,求出其功率谱密度函数后,再通过波动理论得出振动对周围环境的影响.最后提出了评价城市高架桥梁上交通荷载及对周围环境影响程度的新方法.

With the power spectral density, the vibration mechanism and the vibration transfer process of viaduct caused by the traffic load were introduced. Considering the characteristics of vibration transmission in soil, the pier was assumed robe a spring-damping system solidly fixed on the ground and a simple harmonic load was applied on the same place of ground by pier. Its power spectral density function is derived and for the vibration impact on the surrounding environment is obtained by the wave theory. Finally, a new method for evaluating the traffic load, on the viaduct and its impact in the surrounding environment was presented.