| 评价既有桥梁可靠性的FNM法(英文) |
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| 引用本文： | 彭可可,黄培彦.评价既有桥梁可靠性的FNM法(英文)[J].东南大学学报,2009,25(2):247-251. |
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| 作者姓名： | 彭可可 黄培彦 |
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| 作者单位： | 华南理工大学土木与交通学院,广州,510641 |
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| 摘 要： | 结合现行规范及钢管混凝土拱桥的受力特点,给出钢管混凝土拱桥安全-中介-失效三级工作模式的确定准则.据此计算结构的损伤概率与失效概率及对应的可靠度指标,建立可靠度指标与三级工作模式的直接关系.基于三级工作模式,提出评估在役桥梁结构可靠度的有限元-神经网络-蒙特卡罗(FNM)法.根据时变可靠度理论,将结构继续服役期离散化,随机抽样生成蒙特卡罗法所需的最少样本,由随机有限元法计算训练样本,用神经网络扩展训练样本,最后通过蒙特卡罗法计算失效概率和损伤概率,得到结构时变可靠度,判断其工作状态.运用该方法对一座建成10年,主跨83.6 m的钢管混凝土拱桥进行分析,结果表明,该桥主拱处于安全状态,这一结论与实际情况相符.说明FNM法对于评价在役桥梁的可靠性是可行的.
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| 关 键 词： | 既有桥梁 时变可靠度 三级工作模式 蒙特卡罗模拟 FNM法 |
FNM method for estimating reliability of existing bridges |
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| Peng Keke Huang Peiyan.FNM method for estimating reliability of existing bridges[J].Journal of Southeast University(English Edition),2009,25(2):247-251. |
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| Authors: | Peng Keke Huang Peiyan |
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| Institution: | Peng Keke Huang Peiyan(School of Civil Engineering , Transportation,South China University of Technology,Guangzhou 510641,China) |
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| Abstract: | Combined with current specifications and stress characteristics of concrete filled steel tubular(CFST)arch bridges,the determination principle of safe-middle-failure three-stage mode is given.Accordingly,damage probability and failure probability and the corresponding reliability indices are calculated;a direct relationship between reliability indices and three-stage working status is made.Based on the three-stage working mode,a combined FNM(finite element-neural network-Monte-Carlo simulation)method is put... |
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| Keywords: | existing bridges time-dependent reliability three-stage working mode Monte-Carlo simulation FNM method |
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