桥梁系统可靠性评估方法

为了评估桥梁结构系统的工作状态,在桥梁构件可靠性研究的基础上,提出了一种评估桥梁系统可靠性的新方法。利用Markov过程稳态概率作为评价桥梁结构系统可靠性的指标,建立了Markov过程稳态概率与桥梁构件的可靠性指标之间的关系,推导出了系统可靠性的关联矩阵R。对于实际的桥梁结构,可建立系统状态转移矩阵。当桥梁系统中各个构件的可靠性指标已知时,便可以得到系统可靠性的关联矩阵R。通过求解由R构成的Markov过程稳态概率计算方程,可得到桥梁结构系统各个状态的稳态概率,即为评价桥梁结构系统可靠性指标。分析计算结果证明了该方法的有效性和可行性,研究结果为桥梁结构系统可靠性的评估提供了一定的理论基础和实践方法。

Bridge system reliability assessment method

In order to assess the working condition of the bridge structure system(BSS),based on the study results of the BSS components,a new method was proposed to assess the BSS reliability.The Markov process steady-state probabilities were used as the indexes for assessment of the BSS reliability,the relations between Markov process steady-state probilities and BSS components reliability indexes were established and a relational matrix R of the BSS reliability was deduced.For the real BSS,the system state transfer matrix may be established.Given the reliability index of every conponent of the BSS,the relational matrix R of the BSS reliability can be obtained.The steady-state probability of every state,i.e.the reliability assessment index,of the BSS can be derived by the Markov process steady-state probability calculation equation.An example showed that the proposed method is feasible and effective,providing a theoretical basis and practical method to BSS reliability assessment in the design and operation processes.