旧混凝土路面共振破碎力学机理

采用有限元法建立旧混凝土路面的动力学模型,运用ANSYS进行模态分析和谐响应求解.基于混凝土破坏的莫尔-库仑准则判定使路面产生共振破坏的激振力的临界力幅.结果表明:考虑基层影响所得到的模型基频比单纯面层小;路面缺陷会使频率减小;在给定参数下,随着激振力的增大,在路面板中心处产生剪切破坏.

Mechanics mechanism of resonance breaking of worn concrete pavement

The dynamics model of a worn concrete pavement is built by finite element method, and the mode is analyzed and the harmonic response is solved by ANSYS. Based on the Mohr Coulomb criterion of concrete failure, the critical amplitude of excitation force which destroys the pavement is determined. The results show that, the base frequency of the model considering the effect of fundamental layer is smaller than that of the model with only surface layer; the damage on pavement results in the decrease of frequency; under the certain parameters, the shear failure is generated at the center of the pavement slab as the excitation force increases.