不同扩展准则下混凝土断裂全过程分析

USING DIFFERENT CRACK PROPAGATION CRITERIONS TO ANALYSIS THE COMPLETE FRACTURE PROCESS OF CONCRETE

分别采用基于双K断裂模型和虚拟裂缝模型的裂缝扩展准则,计算了混凝土三点弯曲梁试件的荷载-裂缝口张开位移曲线(P-CMOD曲线),并与试验结果进行了对比,结果表明:基于两种模型的裂缝扩展准则的计算结果与试验结果差别不大,但采用基于双K断裂模型的裂缝扩展准则计算的结果与试验结果更为接近。

Two crack propagation criterions based on double-K model and fictitious crack model were introduced to derive the load-crack mouth opening displacement curves （P-CMOD）of three-point bending beams made with concrete.The results indicate that P-CMOD curves calculated using the criterions based on double-K model and fictitious crack model are basically consistent,while the peakload predicted by the propagation based on double-K model is more accurate than using fictitious crack model.