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模拟分析预应力箱梁桥在不同运营密度状态下的应力时程曲线,采用雨流计数法获得结构的应力幅谱,在此基础上依据线性累积损伤理论得出不同运营密度状态下预应力箱梁桥的疲劳损伤度,继而提出了考虑运营车辆密度的线性积伤公式。研究表明:疲劳车辆模型和数量相同的情况下,高速行驶的车辆比一般行车速度的车辆对桥梁疲劳损伤大。考虑运营密度的影响下,当行车间距小于某中间值,行车间距越小、连续车流数量越少对桥梁的疲劳损伤越大。当行车间距大于桥梁计算跨径时,则无需考虑行车间距和连续车流量数目对疲劳损伤的影响。
The stress time history of prestressed box girder bridge under different operating density was simulated and analyzed, and the stress spectrum of the structure was obtained by rain flow counting method. Based on the theory of linear cumulative damage, the prestressed box under different operating density The beam bridge fatigue damage degree, then put forward to consider the linear density of vehicles accumulated injury formula. The results show that vehicles with high speed vehicles have greater fatigue damage to the bridge than vehicles with normal driving speed under the same fatigue model and quantity. Under the influence of the operation density, when the distance between the trains is less than an intermediate value, the smaller the distance between trains is, the less the continuous traffic flow will be, and the greater the fatigue damage will be to the bridge. When the running distance is greater than the calculated span of the bridge, the effect of the running distance and the continuous traffic flow on the fatigue damage is not considered.