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地下铁道属重大工程结构,不但要求具备足够的强度和良好的动力性能,还要求具备足够的可靠性。因此,对于地下铁道中轨下基础来说,不仅要进行静力和动力方面的分析,还必须进行结构可靠性方面的分析研究。所谓可靠性,是指产品在规定条件和时间内完成规定功能的能力,是用安全指标β来衡量的。可靠性研究可以从材料本身(或结构本身)及外部因素等各个角度对结构的安全性作全面分析,从而更能准确地分析结构使用的安全性。
Subway is a major engineering structure, not only requires sufficient strength and good dynamic performance, but also requires sufficient reliability. Therefore, for the underground railway under-rail foundation, not only the static and dynamic analysis, but also the structural reliability analysis must be carried out. The so-called “reliability” refers to the ability of a product to fulfill a prescribed function within the specified conditions and time. It is measured by the safety index β. The reliability study can comprehensively analyze the safety of the structure from various angles, such as the material itself (or the structure itself) and external factors, so that the safety of the structure can be more accurately analyzed.