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为了提高雨水管网的排水的可靠性,将工程结构中的可靠性理论引入雨水管网,在可靠性的基础上利用定量风险分析方法对整个雨水管网进行分析,得出雨水管网的失效概率。首先分析雨水管网内涝失效的功能函数与极限状态函数,研究功能函数中各个随机变量的不确定性;接着提出将一次二阶矩法中的设计验算点法用于评估单个雨水管道内涝失效的可靠性,得出单个雨水管道的内涝失效的可靠指标,进而通过转化得出单个雨水管道的内涝失效概率,整个计算过程在Matlab中实现;最后运用事故树法对整个雨水管网进行定量风险分析,最终得出雨水管网出现内涝失效的概率。算例研究表明,现有的单个雨水管道的可靠性偏低,雨水管网的可靠性也偏低。
In order to improve the reliability of the drainage system of rainwater network, the reliability theory in engineering structure is introduced into the rainwater network. Based on the reliability, quantitative rainstorm analysis is used to analyze the entire rainwater network, and the failure probability of the rainwater network is obtained. Firstly, the function and limit state function of waterlogging failure in rainwater pipe network are analyzed to study the uncertainty of each random variable in function function. Then, the design checking point method in first order second moment method is proposed to evaluate the reliability of waterlogging failure in a single rainwater pipe The reliability of waterlogging failure of a single rainwater pipe is obtained, and then the probability of waterlogging failure of a single rainwater pipe is obtained through transformation. The whole calculation process is implemented in Matlab. Finally, the quantitative risk analysis of the entire rainwater pipe network is carried out by accident tree method, and finally Draw the probability of waterlogging failure of waterlogging. The case study shows that the reliability of the existing single rainwater pipe is low and the reliability of the rainwater pipe network is also low.