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为建立基于可靠性的在役T形截面简支梁桥抗剪承载力临界寿命曲线,并提出相应的受剪承载力剩余寿命实用预测方法,以设计目标可靠指标降低0.5为受弯构件抗剪承载能力最低可靠指标。在引入抗力简单随机过程模型的基础上,通过计算不同评估基准期与最低可靠指标对应的构件抗力相对折减系数限值,建立了基于抗力折减系数限值的受弯构件抗剪承载能力临界寿命曲线和预测方法。最后,以某20 m简支T形梁桥为例进行抗剪承载力寿命预测,计算结果表明,本文提出的抗剪承载力寿命预测方法简单实用,与基于可靠度的在役桥梁承载能力剩余寿命预测方法是等效的,避免了寿命预测中复杂的可靠指标计算过程,可用于在役桥梁受弯构件抗剪承载力寿命预测。
In order to establish the critical life curve of the shear strength of the existing T-section simply supported girder bridge based on reliability and put forward the practical prediction method of the residual life of the corresponding shear capacity, in order to reduce the target of the design reliability by 0.5, Carrying capacity of the lowest reliable indicators. Based on the introduction of simple stochastic process model of resistance, the critical reduction of shear resistance of flexural members based on the resistance reduction coefficient limit is established by calculating the relative reduction factor limits of component resistances corresponding to the minimum evaluation index and the benchmark period. Life curve and prediction method. Finally, the prediction of the ultimate bearing capacity of a 20 m simply supported T-girder bridge is carried out. The results show that the method proposed in this paper is simple and practical, and the remaining capacity of the existing bridge based on reliability The life prediction method is equivalent, which avoids the calculation of complex and reliable indexes in the life prediction and can be used to predict the bearing capacity of the flexural members in service.