结合南京长江第四大桥钢桥面铺装实体工程，开展铺装层混合料20 ℃疲劳性能试验。为了使试验结果能够更真实地反映主桥铺装的实际情况，直接采用主桥铺装使用的混合料成型试件，其中，带钢板复合梁试件为施工现场摊铺、碾压成型。室内试验对铺装结构单层采用劈裂疲劳试验，选择0.2、0.3、0.4、0.5、0.6这5个等级的应力水平，对组合结构采用带钢板复合梁疲劳试验，荷载水平为6 kN、7 kN、8 kN，并通过回归分析得到疲劳方程。

Based on the steel deck pavement of the Fourth Nanjing Yangtze River Bridge, this paper carried out fatigue performance tests of the pavement at 20 ℃. In order to make the results reflecting the actual situation of pavement more realistically, we used main bridge pavement's mixes for molding specimens; molding and rolling composite beam with steel was at the construction site. The splitting fatigue tests and five stress levels of 0.2, 0.3, 0.4, 0.5, 0.6 were used to study the fatigue property of each layer; in dition, the fatigue tests of composite beams with steel plates and three load levels of 6 kN, 7 kN, 8 kN were chosen to study the fatigue property of the composite structure. Finally, the fatigue equation by regression analysis was got.

李国芬（1965—），女，江苏张家港市人，教授，主要研究方向为大跨径钢桥面铺装设计与施工研究