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介绍斜铁路钢桥动态分析的模型。给出一个有限元分析的案例及其与实际测量结果的对比。首先,通过不同模型的特征值分析,得到基础模型选型和桥梁频率,以及评估每个模型分析桥梁动态性能的能力。通过壳单元、梁单元以及组合单元对单跨、三跨和全比例桥梁建模。结果显示,桥梁基本动态特征数值分析结果与试验结果吻合。全比例桥梁模型用于分析特征值和动力时程分析。对不同列车时速和应变记录的分析与实际测量进行比较。疲劳评估通过选取桥梁某一位置的平均应力值也进行了比较研究。结果表明,采用梁单元和壳单元的组合单元的全比例尺模型,可以高效准确地预测桥梁的动力性能和疲劳破坏的平均应力值的范围。
Introduce the model of dynamic analysis of inclined steel bridge. A finite element analysis of the case and its comparison with the actual measurement results. First, through the eigenvalue analysis of different models, the basic model selection and bridge frequency are obtained, and the ability of each model to analyze the dynamic performance of the bridge is evaluated. Single-span, three-span and full-scale bridges are modeled by shell elements, beam elements, and combination elements. The results show that the numerical results of the bridge basic dynamic characteristics are consistent with the experimental results. Full-scale bridge models are used to analyze eigenvalues and dynamic time history analysis. The analysis of different train speed and strain records is compared with the actual measurement. The fatigue assessment is also compared by selecting the average stress value at a certain location of the bridge. The results show that using the full-scale model of the combined elements of beam element and shell element, the dynamic performance of bridge and the range of average stress value of fatigue failure can be predicted efficiently and accurately.