三、弯曲应力 1.轮重引起的弯曲应力进行轨道的力学分析时,把钢轨看作梁,把轨枕、道床、路基等看作传递压力的弹性支承体。在日本如图9(b)所示,钢轨是等间隔地弹性支承在轨枕上,按弹性点支承的连续梁求解。可是在欧美以及最近在日本广泛地把轨枕、道床、路基一起看作为连续弹性基础, Third, the bending stress 1. Wheel load caused by bending stress Analysis of the track, the rail as a beam, the sleeper, track bed, roadbed and so on as the pressure transmission elastic support body. In Japan, as shown in Fig. 9 (b), the rails are elastically supported at equal intervals on the sleepers and are solved by the continuous beams supported by the elastic points. However, in Europe and the United States and more recently in Japan, sleepers, ballast beds and embankments are collectively considered as a continuous elastic foundation,