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在风与桥梁结构相互作用的过程中,由于存在多种不确定因素,可能会导致出现不同程度的风振灾害,并且大跨度斜拉桥出现风灾后的损失严重。介绍了一般风险分析理论构架,在此基础上划分了桥梁结构风险概率限值范围,并建立了风灾风险评估矩阵。采用层次分析法对大跨度斜拉桥建立风险层次分析模型,并利用有限元模型——蒙特卡罗评估方法对其进行风灾评估。结合ALARP准则对斜拉桥的风致振动灾害风险评估体系进行研究,依据风洞试验与有限元计算结果识别出其风险等级。
During the interaction between the wind and the bridge structure, due to various uncertainties, it may lead to different degrees of wind-induced disasters, and the loss of long-span cable-stayed bridges after a wind disaster is serious. The general framework of risk analysis is introduced. Based on this, the limits of risk probability of bridge structure are divided and the risk assessment matrix of wind disaster is established. Analytic Hierarchy Process (AHP) is used to establish risk stratification analysis model for long-span cable-stayed bridges, and wind-disaster assessment is carried out by using the finite element model-Monte Carlo method. Combined with ALARP criterion, the risk assessment system of wind induced vibration of cable-stayed bridges is studied. According to the results of wind tunnel test and finite element analysis, the risk grade is identified.