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基于中国公路交通的特点,从交通荷载的调查,典型车辆频值谱的确定,标准疲劳车模型的确定以及标准疲劳车模型的纵、横向修正等几个方面全面阐述了公路钢桥疲劳设计标准荷载的确定过程。并以东北某省为例,给出了汽车荷载的调查统计结果、标准疲劳车的推导结果以及多车效应的纵向修正结果等。这一结论为疲劳设计提供了标准车辆荷载模型,填补了中国公路钢桥疲劳设计中的空白,也为公路钢桥的运营管理和养护维修提供了有力的参考依据,对提高桥梁的耐久性具有现实的指导意义。
Based on the characteristics of China’s road traffic, this paper comprehensively elaborates the fatigue design standards of highway steel bridges from the aspects of traffic load survey, the determination of typical vehicle frequency spectrum, the determination of standard fatigue vehicle model and the vertical and horizontal correction of standard fatigue vehicle model Determination of load. Taking a province in northeastern China as an example, the statistic results of car load, the result of standard fatigue car and the longitudinal correction results of multi-car effect are given. This conclusion provides a standard vehicle load model for fatigue design and fills the gap in the fatigue design of highway steel bridges in China. It also provides a powerful reference for the operation, management, maintenance and repair of highway steel bridges, and has the potential to improve the durability of bridges Practical guidance.