摘要
To investigate the fatigue damage of epoxy asphalt pavement(EAP)under a heavy load and a d temperature load,the load-figure of the heavy load on the steel bridge deck pavement(SBDP)was simulated first,and the temperature distribution of SBDP during the temperature-fall period in winter was also calculated.Secondly,t e moving heavy load coupled W t the most unfavorable temperatre load was applied to the SBDP,and the tensile stress on the top of SBDP was calculated.Finally,the fatigue damage of EAP was evaluated considering the extreme situation of heavily overloaded and severe environments.The results show that botte heavy load and the temperature load during t e temperature-fall period c n increase the tensile stress on the top of SBDP significantly.In the exteme situation of heavily overloaded and severe environments,a fatigue crack is easily generated,and thus the SBDP should avoid t e coupling effects of the heavy loadand the temperature load in winter.
为研究重载和温度荷载耦合作用对环氧沥青铺装结构疲劳损伤的影响,首先模拟了钢桥面铺装重载的荷载图示,同时计算了冬季降温过程中钢桥面铺装结构的温度分布.然后,将移动重载和最不利温度荷载施加到钢桥面铺装结构,计算铺装表面拉应力.最后,考虑严重超载和恶劣低温等不利条件,进行环氧沥青铺装结构疲劳损伤分析.结果表明:重载和降温过程产生的温度荷载都可显著增加铺装表面拉应力,严重超载和恶劣低温等不利条件下,钢桥面铺装容易产生疲劳裂缝,因此,应该尽量避免冬季重载和温度荷载的耦合作用.
基金
The National Natural Science Foundation of China(Nos.51378122,51678146)
the Scientific Research Foundation of Graduate School of Southeast University(No.YBJJ1680)
