【摘要】 基于车辆—轨道—桥梁耦合振动理论,建立车—线—桥耦合计算模型,引入轨道不平顺功率谱密度的概率分布模型,运用推广傅里叶幅度敏感性检验(eFAST)方法,考虑参数间的耦合作用,研究桥梁上部结构部分参数和不同类型的轨道不平顺对车—线—桥耦合系统动力响应的影响。结果表明:轨道方向不平顺是影响车辆横向加速度和横向轮轨力的关键参数;轨道高低不平顺是影响车辆竖向加速度和竖向轮轨力的关键参数;桥梁上部结构的弹性模量是影响其动力响应的关键参数。验证了eFAST方法在车—线—桥耦合系统参数敏感性分析方面的可行性。更多还原

【Abstract】 Based on the vehicle-track-bridge coupling vibration theory, a vehicle-track-bridge coupling calculation model was established, and the probability distribution model of power spectral density of track irregularity was introduced. Based on the extended Fourier Amplitude Sensitivity Test(eFAST) method, the influence of bridge superstructure parameters and different types of track irregularities on the dynamic response of vehicle-track-bridge coupling system was studied by taking into account the coupling effects between random parameters. Results show that the track alignment irregularity is the key parameter affecting vehicle lateral acceleration and lateral wheel-rail force. The track vertical profile irregularity is the key parameter affecting vehicle vertical acceleration and the vertical wheel-rail force. The elastic modulus of the bridge superstructure is the key parameter affecting its dynamic response. The feasibility of eFAST method in parameter sensitivity analysis of vehicle-track-bridge coupling system is verified.更多还原