动水压力对钢桥面环氧沥青铺装裂缝扩展影响

The Influence of Hydrodynamic Pressure on the Propagation of Steel Bridge Deck Epoxy Asphalt Concrete Pavement Crack

钢桥面环氧沥青混凝土铺装发生裂缝病害后，水渗入裂缝，病害不断扩展．研究动水压力对钢桥面环氧沥青混凝土铺装裂缝的扩展作用，采用ABAQUS建立带裂缝的钢桥面环氧沥青混凝土铺装体系模型，模拟不同温度、不同铺装裂缝长度、宽度、深度及数量等条件，并通过数值分析铺装裂缝尖端的J积分值表征裂缝发展趋势．研究结果表明，动水压力越大，铺装裂缝尖端的J积分值越大，动水压力对裂缝扩展的作用越明显；铺装层温度在0～30℃时，温度越高，铺装裂缝尖端的J积分值越大，动水压力对裂缝扩展的作用越明显；动水压力对裂缝扩展的作用，受铺装裂缝长度、宽度影响大，受铺装裂缝深度、纵向裂缝数量影响小；同一动水压力作用下，网状裂缝更容易发生裂缝扩展．

After cracks appear on steel bridge deck epoxy asphalt concrete pavement, the water would seep in- to cracks which would lead to crack propagation. This paper studied the impact of hydrodynamic pressure on the propagation of steel bridge deck epoxy asphalt concrete pavement crack. ABAQUS was utilized to build a model of steel bridge deck epoxy asphalt concrete pavement with crack. The J integral of pavement crack un- der different temperatures, different pavement crack widths, different pavement crack lengths, different pave- ment crack depths and different number of pavement cracks were calculated. The impact of hydrodynamic pressure on steel bridge deck epoxy asphalt concrete pavement crack propagation was discussed. The results indicated that when hydrodynamic pressure increased, the J integral of pavement crack tip increased, and the effect of hydrodynamic pressure on crack propagation was more obvious. When the temperature was within the range of 0~C to 30~C , the increase of temperature would lead to the increase of J integral of pavement crack tip and the effect of hydrodynamic pressure on crack propagation would be more obvious. The effect of hydrody- namic pressure on the crack propagation changed obviously under different crack lengths and widths, while the effect of hydrodynamic pressure on the crack propagation different number of longitudinal crack. Pattern cracking pressure. changed unobviously under different crack depths and was easy to propagate under the same hydrodynamic