The non-stationary random action process of the traffic load on the pipeline is affected by many factors, such as the amount of traffic, the type of vehicle, the incentive effect of the car itself, and the collision between the vehicle and the road, etc. The size, form and point of action of the force Is a function of time. The function finally manifests as the random stress wave of wheel load acting on the pipeline, causing obvious deviation of the pipeline stress, thus extracting the stress mean and deviation.
The mean value of the stress caused by the vehicle load is the spell, the mean value of the strength is the spell, and the standard deviation of the stress and the strength is Gong He's. Let y = go-x, the reliability expression of the pipeline from the reliability principle is that the above analysis is mainly applicable to the single traffic load situation.
The traffic load mainly exists in the form of mixed traffic in the actual traffic flow, and the load of the traffic vehicle is changing at any time, not a single load situation (according to the regulations, the mixed traffic load can be converted into medium-sized trucks and cars as the standard The equivalent traffic load, so we will analyze it in the form of two traffic loads later).
Therefore, according to the changing characteristics of traffic load, in order not to lose the generality, assuming that the vehicle load increases, the working stress and damage of the pipeline will change accordingly, and its strength and average strength will be reduced by the influence of the damage, and its strength The standard deviation of can be considered unchanged, and the standard deviation of its stress will increase.
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