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现有在役拱桥吊杆疲劳分析中,较少考虑车-桥耦合振动因素,致使分析成果具有一定局限性。该文综合考虑车-桥耦合振动和路面平整度退化影响,将路面平整度退化模型引入拱桥吊杆疲劳分析中,结合交通量增长和路面等级退化以及车速等影响因素,建立了新的吊杆疲劳分析模型。以某拱桥为工程背景,对比分析了典型吊杆的疲劳损伤与疲劳寿命的影响因素。结果表明:在设计基准期内,基于车-桥耦合因素的在役拱桥吊杆疲劳分析得到的疲劳损伤较大、疲劳寿命较短,计算结果更加精确,研究成果对桥梁结构的正常使用状态评估有一定的促进意义。
Existing fatigue analysis of the existing arch bridge suspender, less consider the vehicle-bridge coupling vibration factor, resulting in the analysis of the results have some limitations. In this paper, considering the influence of vehicle-bridge coupling vibration and the degradation of road surface flatness, the degradation model of road surface roughness is introduced into the fatigue analysis of boom of arch bridge. Considering the traffic volume growth and the degradation of road surface grade and vehicle speed, a new boom Fatigue analysis model. With an arch bridge as the engineering background, the influencing factors of fatigue damage and fatigue life of typical boom were analyzed. The results show that fatigue damage of the existing arch bridge suspenders based on the vehicle-bridge coupling factor is large, the fatigue life is short and the calculation results are more accurate. The results of the research appraise the normal condition of the bridge structure Have a certain sense of promotion.