铁路框架桥纵横梁线路加固体系模型优化与结果评价标准研究

Model Optimization and Evaluation Standard of Railway Track Strengthening System with Longitudinal-Transverse Beams during Construction of Frame Bridge

对静力计算的模型进行了优化,建立加入钢轨、纵梁及扣轨梁等纵向构件的三维模型,考虑了支撑加固体系的框构桥及开挖土体的影响;设置变化不同参数的多个工况,将优化模型与简化模型在各工况下的数值模拟结果进行比较与分析;综合考察相关规范及规定,从而建立评价纵横梁线路加固体系静力计算结果的标准。基于模拟计算的结果,分析了各工况下横梁的挠度和应力以及钢轨的挠度,并利用建立的评价标准进行评价。研究表明,优化模型能够较精确地模拟现场工况,使计算结果更加贴近真实值;利用建议的线路加固体系评价标准对计算结果进行评价,得到的结论将更加偏于安全。

In this paper, the static calculation model of railway track strengthening system was optimized, and a three-dimensional model with longitudinal members was built involving rail, longitudinal beam, track-fastening beam, and so on; and also the influences of frame bridge and soil excavation on the strengthening system were taken into consideration. Then, by giving multiple working conditions with＆nbsp;different parameters, a comparative analysis of numerical simulation results between the optimized model and the simplified model was carried out under each working condition. Then, comprehensively considering relevant standard codes and specifications, an evaluation standard of static calculation result of railway track strengthening system with longitudinal-transverse beams was established. Furthermore, based on simulation calculation results, the transverse beam＇s deflection and stresses as well as the rail＇s deflection were analyzed under each working condition, and the results were evaluated by using the suggested evaluation standard. The research results show that the optimized model can more accurately simulate the field working conditions, making the calculation result more reliable; and if evaluating calculation results by using the suggested evaluation standard, the evaluation conclusion will be on the safe side.