摘要
研究了行车纵剪力计算与损伤路面的机理。建立半刚性路面的有限元模型,计算路面裂纹在行车纵剪力作用下的应力强度因子。行车纵剪力是服从正态分布的随机过程,标准方差可以通过行车纵振路面谱和车辆纵振模型得到;裂纹从上到下扩展的速度明显快于从下往上扩展的速度;裂纹扩展的速度与行车纵剪力的4次幂成正比;行车纵剪力对路面的裂纹损伤远远大于轮胎压力。
The longitudinal shearing force of running vehicles(LSFRV) is computed and the mechanism of pavement damage studied. The finite element model of semi-rigid pavements is created and the stress intensity factor of crack under the effect of LSFRV computed. LSFRV is a stochastic process obeying Gaussian distribution whose standard deviation can be gotten by the longitudinal vibration pavement spectral density of running vehicles and the longitudinal vibration model of running vehicles. The crack extending speed from top to bottom is evidently faster than the crack from the bottom to top. The speed changes with direct proportion to the fourth power of the LSFRV. The pavement damaged by the LSFRV is far greater than that damaged by the vertical tyre forces.
出处
《公路》
北大核心
2005年第4期91-95,共5页
Highway
基金
山东省自然科学基金项目 (Y99Q11)
