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以宁启既有线平改立工程为实例,在现场监测数据的基础上,采用ANSYS有限元分析软件进行动力响应数值模拟,运用正交极差分析法,设计了9组模拟试验。以支墩顶部的沉降值、便梁跨中挠度的最大值及便梁跨中挠度的最大值与最小值间的差值作为支护主体稳定性的评判指标。结果表明,列车的激振频率对支护主体稳定性的影响最大,车速次之,车重的影响较小。通过分析给出了各影响因素与支护主体稳定性间的关系曲线,为既有线桥涵施工时各影响因素的合理取值指明了方向。
Based on the on-site monitoring data, ANSYS finite element analysis software was used to carry out dynamic response numerical simulation. An orthogonal range analysis method was used to design nine sets of simulation tests. The settlement value of the top of the pier, the maximum value of the mid-span deflection of the beam and the difference between the maximum value and the minimum value of the mid-span deflection of the beam are taken as the evaluation indexes for the stability of the main body. The results show that the excitation frequency of the train has the greatest impact on the stability of the support body, the second is the vehicle speed, and the impact of the vehicle weight is small. Through the analysis, the relationship curve between each influencing factor and the stability of the supporting body is given, indicating the direction for the reasonable value of each influencing factor in the construction of existing bridges and culverts.