【摘要】 研究了桩土动力相互作用对车桥耦合系统动力响应的影响。基于子结构方法,将完整的列车-桥梁-桩基础-地基相互作用模型分解为列车-桥梁相互作用子系统和桩基础-地基相互作用子系统,分别建立两个子系统的运动方程。在建立桩基础-地基相互作用子系统的运动方程时,为了考虑该系统的频率相关性,通过连续时间有理近似将频域内的阻抗函数转化至时域内,并用一个高阶弹簧-阻尼-质量模型模拟。通过迭代计算得到两个子系统的动力响应。以一列8节编组的客车通过5跨简支梁为算例,研究了桩土相互作用对车桥耦合系统动力响应的影响。研究结果表明,考虑桩土相互作用以后,车桥耦合系统动力响应有所增加,在今后的分析中应充分考虑该因素的影响以获得偏于安全的计算结果。更多还原

【Abstract】 The influence of soil-pile interaction on the dynamic response of a train-bridge coupled system was studied. Based on the substructure method,the whole train-bridge-pile foundation-soil system was divided into the trainbridge interaction subsystem and the pile-soil interaction subsystem,the motion equations of them were established,respectively. When establishing the latter’s motion equation,in order to consider the system’s frequency correlation,its impedance function in frequency domain was converted approximately into that of a high-order spring-damping-mass model in time domain. The dynamic responses of the two subsystems were obtained with the iteratively solving method,respectively. A train with 8 cars passing through a 5-span simply-supported beam bridge was taken as a case study,influences of soil-pile interaction on the dynamic response of the train-bridge coupled system were studied. The results showed that after considering soil-pile interaction,dynamic responses of the train-bridge coupled system increase; so,the effects of soil-pile interaction should be considered fully in future computations to get the results on safe side.更多还原