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水力发电学报 ›› 2022, Vol. 41 ›› Issue (8): 144-152.doi: 10.11660/slfdxb.20220814

• • 上一篇    

渡槽在复合随机作用下的输水功能可靠性研究

  

  • 出版日期:2022-08-25 发布日期:2022-08-25

Water-conveyance functional reliability analysis of aqueducts subject to coupled randomness from structural parameters and excitations

  • Online:2022-08-25 Published:2022-08-25

摘要: 钢筋混凝土渡槽结构在各类随机因素影响下的可靠性对调水工程的安全运行至关重要。本文基于结构随机动力学与损伤破坏分析领域的最新成果,提出了渡槽结构的复合随机动力分析方法,能够将来自渡槽结构参数的随机性和地震激励的随机性进行合理统一考虑。进一步提出渡槽输水功能可靠性指标,建立其在复合随机作用下的输水功能可靠性计算方法。以运行中的关帝庙渡槽为例,系统开展了渡槽在考虑不同随机因素影响下的输水功能可靠性研究。结果表明,钢筋混凝土渡槽在复合随机作用下的随机动力响应与仅考虑地震激励随机性的计算结果相比具有更显著的变异性,同时钢筋混凝土渡槽可靠性水平分析结果也有所降低;地震激励随机性对渡槽结构响应和可靠性的影响明显大于材料参数随机性的相应影响;在计算渡槽结构输水功能可靠性时全面考虑以上两种随机因素的复合影响是十分必要的。

关键词: 钢筋混凝土渡槽, 结构参数随机性, 地震激励随机性, 复合随机, 输水功能可靠性

Abstract: The reliability of reinforced concrete (RC) aqueduct structures that suffer the influence of various random factors is crucial to the safe operation of water diversion projects. For a large hydraulic RC aqueduct or important water conveyance structure, it is of great practical significance to ensure its water conveyance function reliability under the influence of various random factors. Based on the latest achievements in the field of structural random dynamics and damage failure analysis, a random dynamic analysis method of aqueduct structures is presented in this paper, which considers reasonably the randomness of structural parameters of a large RC aqueduct and the randomness of its seismic excitation. Reliability indexes are formulated according to its water conveyance function requirements; a method is developed to calculate its water conveyance function reliability under combined random conditions. A comparative analysis of the reliability is made systematically in a case study of an aqueduct in operation under the influence of different random factors. The result shows that for an RC aqueduct under combined random conditions, its random dynamic response has more significant variability than that of only the randomness of its seismic excitation considered, and its reliability level is lowered considerably. This reveals the influence of seismic excitation randomness on the response and reliability of an aqueduct structure is obviously greater than that of material parameter randomness. Thus, it is very necessary to consider comprehensively the combined influence of the above two random factors in calculation of the water conveyance function reliability of aqueduct structure.

Key words: reinforced concrete aqueduct, structural parameter randomness, seismic excitation randomness, combined randomness, water conveyance function reliability

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