Simulation and analysis of two-point bending fatigue test of asphalt concrete based on discrete element model  

基于DEM的沥青混凝土两点弯曲疲劳试验模拟分析（英文）

作　　者：Cao Qingqing Liu Xiuyu Wang Hao Huang Xiaoming 

机构地区：[1]School of Transportation, Southeast University, Nanjing 210096, China [2]Departrnent of Civil and Environmental Engineering, Rutgers, State University of New Jersey, Piscataway, NJ 08854, USA

出　　处：《Journal of Southeast University(English Edition)》2017年第3期286-292,共7页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.51378121)

摘　　要：In order to investigate the fatigue performance of French high modulus asphalt concrete and the correlation between Burger's parameters and fatigue life, the virtual model of asphalt mixture trapezoidal specimen in the two-point bending fatigue test was constructed in discrement element software PFC3D. The initial stiffness and the maximum stress when the specimen reached fatigue were calculated. Through the comparison between virtual and single field fatigue test curves, the credibility of simulation in DEMwas verified.Then, the impacts of top controlled displacement and Burger's parameters( E_1,E_2,η_1,η_2) on the fatigue life of the specimen were explored. The simulation results indicate that the maximum stress increases with the increase in the top controlled displacement. With the increase of E_1 and the decrease of E_2 in Burger's model, the modulus of the asphalt binder increases, and the fatigue performance of the asphalt mixture enhances. η_1 and η_2 have limited influence on fatigue life compared with E_1 and E_2.In order to investigate the fatigue performance ofFrench high modulus asphalt concrete and the correlationbetween Burger＇s parameters and fatigue life, the virtualmodel of asphalt mixture trapezoidal specimen in the two-pointbending fatigue test was constructed in discrement elementsoftware PFC3D. The initial stiffness and the maximum stresswhen the specimen reached fatigue were calculated. Throughthe comparison between virtual and single field fatigue testcurves, the credibility of simulation in DEM was verified.Then, the impacts of top controlled displacement and Burger＇sparameters （ El, E2, η1, η2） on the fatigue life of the specimenwere explored. The simulation results indicate that themaximum stress increases with the increase in the topcontrolled displacement. With the increase of E1 and thedecrease of E2 in Burger＇s model, the modulus of the asphaltbinder increases, and the fatigue performance of the asphaltmixture enhances, η1 and η22 have limited influence on fatiguelife compared with El and E2.

关 键 词：high MODULUS ASPHALT concrete numericalsimulation Burger's parameters FATIGUE LIFE 

分 类 号：N0[自然科学总论—科学技术哲学]