利用权函数计算沥青路面层间部分约束的面层底裂缝应力强度因子

以受均匀拉应力的中心贯穿裂缝作为参考状态 ,利用权函数理论和PetroskiandAchenbach方法得到路面各层面完全连续时的裂缝应力强度因子计算方法。根据完全连续时的应力强度因子和面层界面处于临界静摩擦状态下的应力强度因子的等效性 ,计算出面层界面的等效滑动区域 ,从而得到面层界面滑动摩擦力产生的应力强度因子 ,再与面层界面完全光滑时的应力强度因子叠加 ,得到面层界面部分约束时的应力强度因子 ,编制了相应的程序 ,给出了相应的计算实例。

Calculation on the stress intensity factor for the bottom crack of asphalt layer in asphalt pavement considering partial constraint by weight function

The stress intensity factor for the crack at the bottom of asphalt layer with supposion of the completely continuous interface is got using the center crack subjected to normal tensile stress as the reference state according to weight function mechanism and Petroski and Achenbach's method. The equivalent friction area on the interface of asphalt layer is got by the equivalence between the stress intensity factor supposing that the interface is completely continuous in a critical static slide state, so the slide friction force and the stress intensity factor can be got.The stress intensity factor considering partial constraint on the interface can be got by the superposition between the stress intensity factor for the bottom crack supposing the interface is completely smooth and that by the critical static friction force. The corresponding program is made to calculate the stress intensity factor and an example is also given.