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按目前规范的要求,轨道交通高架车站结构需要采用极限状态法和容许应力法两种不同的方法进行计算。设计人员对这两种方法的本质及计算结果的差异往往缺乏足够的认识。为厘清两种方法对设计结果的影响,以钢筋混凝土轨道梁为研究对象,对两种计算方法的计算结果进行比较分析。另外,对规范给出的基本公式进行推导,以期得到适用性更广泛的结论。结果表明,容许应力法的计算结果更为保守。计算结果的差异与配筋率和材料强度有关,当配筋率较大时,计算结果差异随配筋率增大而增大;当钢筋强度不变时,计算结果差异随混凝土强度的增大而减小。研究成果有利于简化高架车站轨道梁等受弯构件的设计,同时也为将来铁路规范的修订提供参考。
According to the current normative requirements, the structure of elevated railway station should adopt two different methods of limit state method and allowable stress method. Designers often lack sufficient knowledge of the nature of the two methods and the differences in their calculated results. In order to clarify the influence of the two methods on the design results, the reinforced concrete track beam is taken as the research object, and the calculation results of the two methods are compared and analyzed. In addition, the basic formulas given in the specification are deduced, with a view to obtaining a more general conclusion. The results show that the allowable stress method is more conservative. The difference of the calculation results is related to the reinforcement ratio and the material strength. When the reinforcement ratio is large, the difference of the calculation results increases with the reinforcement ratio. When the reinforcement strength is constant, the difference of the calculation results increases with the increase of the concrete strength And reduce. The research results are conducive to simplifying the design of flexural members such as elevated girder track girders, and also provide reference for the revision of railway codes in the future.