【摘要】 基于动力半空间理论及路基与半空间的等效条件,得到考虑频响特性的路基频变等效参数;采用有限元法建立无砟轨道-路基动力分析叠合梁模型与梁板模型,并考虑轨道不平顺激励的轮轨力施加于钢轨的不同位置,分析不同荷载施加情况下的轨道结构动力响应特性,并将数值模拟结果与现场实测值进行对比,验证建模方法及路基等效参数计算方法的可靠性。该方法真实地反映了轨道-路基结构的频响特性,不仅可应用于轨道-路基动力响应分析,也可应用于整个线路系统的动力分析中。更多还原

【Abstract】 The subgrade in composite beam model and beam and slab model of the ballastless track-subgrade can be equivalently assumed to be the spring and damping of fixed parameters in dynamic analysis.The research described is based on the semi-space theory of dynamic foundation and the equivalent conditions of subgrade and semi-space to obtained the frequency-dependent subgrade equivalent parameters,and adopts the finite element method to establish composite beam model and beam and slab model of the ballastless track-subgrade dynamic analysis.Applying the wheel-track force considering unevenness excitations on the different positions of the steel rails,and the similarities and differences of the track structure dynamic response characteristics are analyzed for the different models with different loading cases.The numerical results are compared with the measured ones,and the reliability of this modeling method as well as the calculation method of equivalent parameters of subgrade is verified.It shows that this method can reflect more realistic characteristics of the subgrade structure and even the frequency response in the entire track line system.更多还原