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公路桥梁活载是桥梁疲劳失效的主要影响因素,而公路桥梁承受活载情况极其复杂,要制定普遍意义上的疲劳荷载谱,必须选取典型路段进行交通量调查,经过统计分析得到实测的车辆荷载频值谱。根据等效疲劳损伤原理,将实测的车辆荷载频值谱简化为由疲劳荷车辆组成的荷载频值谱,根据车辆组成的荷载频值谱建立了云南省公路桥梁疲劳荷载车辆模型。研究结果表明造成云南省内公路桥梁疲劳累积损伤的主要车辆为两轴的大型客车及货车,研究结果可供云南省公路桥梁疲劳损伤验算或疲劳设计时参考。
The live load of highway bridges and bridges is the main factor affecting the fatigue failure of bridges. However, the live loads of highway bridges and bridges are extremely complicated. To establish the fatigue load spectrum in the general sense, the typical road sections must be selected for traffic investigation, and the measured vehicle loads Frequency spectrum. According to the principle of equivalent fatigue damage, the measured frequency spectrum of vehicle load is simplified to the frequency spectrum of load consisting of vehicles with fatigue load. According to the spectrum of load frequency components of vehicles, the fatigue load vehicle model of highway bridge in Yunnan Province is established. The results show that the main vehicles causing the cumulative fatigue damage of highway bridges and bridges in Yunnan Province are two-axis large-scale passenger cars and trucks. The results can be used as a reference for checking the fatigue damage or fatigue design of highway bridges in Yunnan Province.