基于疲劳等效的钢桥面铺装体系轴载换算方法

Conversion method of axle-load for steel bridge deck based on fatigue-equivalent

针对钢桥面铺装设计必须控制的疲劳和车辙主要破坏形式,提出了钢桥面铺装结构设计的疲劳指标与车辙指标,遵循疲劳和车辙等效轴载换算原则,应用疲劳等效原理,推导出基于疲劳等效的钢桥面铺装体系轴载换算公式。根据室内疲劳试验及力学分析结果,确定了该公式中的换算指数和其他轴型与轮组轴载换算为单轴双轮组的轴载换算系数。结果表明,对于钢桥面浇注式沥青混凝土铺装体系的轴载换算指数为4 35,对于钢桥面改性沥青SMA铺装体系的轴载换算指数为5 30,对于钢桥面环氧沥青混凝土铺装体系的轴载换算指数为6 25,在钢桥面铺装设计与验算中,经换算其结果较为精确、可行。

The index system of structure design was proposed according to the fatigue failure type and rutting failure type of steel bridge deck, and it was classified into two types, one is fatigue index, another is rutting index. The conversion method of axle-load was proposed based on its fatigue and rutting equivalent ruks. The conversion formulas of steel bridge deck were proposed based on fatigue equivalent ruks. The conversion exponents and coefficients of other axle-type and wheel-type of the formulas were computed according to fatigue tests and mechanical analysis. Computation results show that the conversion exponent is 4.35 for guss asphalt concrete pavement, the conversion exponent is 5. 30 for modified asphalt SMA pavement, the conversion exponent is 6. 25 for epoxy asphalt concrete pavement. The conversion formulas can be applied to design or check the computation of steel bridge deck pavement, and its conversion results are precise and feasible.