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工程力学  2015 

基于可靠度理论的桥梁涡激振动概率性评价

DOI: 10.6052/j.issn.1000-4750.2014.04.0280

Keywords: 大跨度桥梁,涡激共振,二次四阶矩法,失效模式,失效概率

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Abstract:

涡激共振是大跨度桥梁在低风速下容易发生的一种风致振动,涉及的不确定因素众多,利用可靠度理论对这类风致振动进行安全估算是大跨度桥梁风振研究的趋势。探讨了桥梁涡振的三种失效模式,包括基于涡振风速的失效模式、基于涡振振幅的失效模式和基于前两种失效模式交集的涡振刚度失效模式,基于此,以某座大跨度桥梁为例,应用二次四阶矩法计算了基于涡振振幅的失效概率,并与二次二阶矩法的计算结果进行了比较,用MonteCarlo模拟法(MC)进行了验证,发现基于二次四阶矩法的可靠度分析相对于二次二阶矩法具有较高的精度。然后,基于二次四阶矩法的计算结果得到了桥梁涡振刚度失效的概率,研究表明：单独考虑桥梁涡振发生风速或涡振振幅的失效概率偏于保守,应结合起来考虑。

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