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介绍了国外公路桥梁荷载谱以及我国各省标准疲劳车的推导过程。通过对简支梁影响线按照各个规范规定的荷载谱加载计算得到等效弯矩,并对其进行内力幅的比较分析,为桥梁疲劳设计时荷载选用提供理论基础。发现对于影响线较短的小跨径桥梁而言,轴重的变异系数比车重的变异系数更大;而对于影响线较长的大跨度桥梁而言,车重的变异系数比轴重的变异系数大。为了更进一步证实理论研究的合理性,通过一个工程实例,进行了各国标准疲劳车的比较分析。结合理论和实例的结论,最终确定了适合我国交通荷载的标准疲劳车。并且通过与英国BS5400规范规定的标准疲劳车所做的损伤度比较,表明我国推导出来的标准疲劳车是适合我国国情的,可为今后的桥梁疲劳设计奠定理论基础,具有现实的指导意义。
The paper introduces the load spectrum of foreign highway bridges and the derivation process of standard fatigue trucks in all provinces in China. By calculating the equivalent bending moment according to the load spectrum of each specification, the influence curve of simply supported beam is calculated and compared with the internal force amplitude, which provides the theoretical basis for the selection of the fatigue load on the bridge. It is found that the coefficient of variation of axle load is larger than the coefficient of variation of vehicle weight for long-span bridges with short impact line. For long-span bridges with long line of influence, the coefficient of variation The coefficient of variation is large. In order to further confirm the rationality of theoretical research, through a project example, a comparative analysis of standard fatigue vehicles in various countries. Combined with the conclusion of the theory and the example, the final standard fatigue truck suitable for the traffic load of our country is finally determined. And compared with the standard fatigue car made by British BS5400 standard, it shows that the standard fatigue car derived from our country is suitable for our national conditions, which can lay a theoretical foundation for the design of bridge fatigue in the future, which has the realistic guiding significance.