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为研究公路钢桥疲劳荷载横向效应,根据公路桥梁的交通特点和过桥车辆的随机性,采用已推导出的公路钢桥标准疲劳车辆荷载模型,基于Palmgren-Miner线性累积损伤准则,计算构件累积损伤度。运用概率理论分析方法,通过多辆车在同一车道上同时行驶、多辆车在不同车道上同时行驶、多辆车在不同车道上交替行驶,3种公路桥梁横桥向多车效应的情况分析,得出2、3、4车相遇概率与次数的计算方法,最终推导出公路钢桥疲劳设计时考虑横向多车效应确定横向系数的方法。给出适合我国国情的公路钢桥疲劳设计的荷载谱,以及疲劳设计时应采用的横桥向多车效应修正系数。
In order to study the transverse effect of highway steel bridge fatigue load, according to the traffic characteristics of highway bridge and the randomness of crossing bridge vehicle, the standard fatigue vehicle load model of highway steel bridge has been derived. Based on Palmgren-Miner linear cumulative damage criterion, Damage degree. Probabilistic theory analysis method is used to simulate the multi-car effect of three types of highway bridges with multiple vehicles traveling in the same lane at the same time, with multiple vehicles traveling in different lanes at same time and with multiple vehicles traveling alternately in different lanes. , The calculation method of the probability and number of encountering 2,3,4 cars is obtained, and finally the method of determining the lateral coefficient considering the multi-lateral effect in the fatigue design of highway steel bridge is derived. The load spectrum of fatigue design of highway steel bridge which is suitable for the national conditions of our country and the correction factor of transverse multi-vehicle effect of multi-axle in fatigue design are given.