路面谱激励下的运营桥梁结构的响应分析

基于运营桥梁结构中不同路谱激励样本的差异,分别计算了特定样本下,车速变化时桥梁结构、运营车辆的位移、速度、加速响应.采用标准路面等级的功率谱密度,运用余弦叠加方法,模拟了不同样本的各等级路面谱激励;采用直接积分的方法,计算了加入路面随机激励后的车桥振动的微分方程,分析了不同路面等级、不同车速下系统的响应.结果表明:随机相位角、功率谱密度等级分别影响路面谱激励的样本形状和幅值大小,不同随机样本具备相同统计特征;对于系统的响应曲线,路面平整度等级对幅值影响相对显著,车速变化对形状影响相对显著;根据算例中不同路面平整度等级的计算结果,给出了相应的工程建议.

Operational Bridge Responses due to Road Surface Profile Spectral Excitations

Random spectrum excitation samples of a road surface profile are investigated.The displacements,velocities,accelerations of a vehicle and a bridge structure are discussed using certain samples.The road excitations are numerically simulated by the random phase cosine method of the power spectral density.The vehicle bridge system responses are obtained using the vehicle bridge differential equations for different road surface profiles.It is concluded that the random phase has critical effects on the road surf...