[1] Peng Keke, Huang Peiyan,. FNM method for estimating reliability of existing bridges [J]. Journal of Southeast University (English Edition), 2009, 25 (2): 247-251. [doi:10.3969/j.issn.1003-7985.2009.02.022]

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FNM method for estimating reliability of existing bridges()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

25

Issue:

2009 2

Page:

247-251

Research Field:

Traffic and Transportation Engineering

Publishing date:

2009-06-30

Info

Title:

FNM method for estimating reliability of existing bridges

Author(s):

Peng Keke;  Huang Peiyan

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China

Keywords:

existing bridges;  time-dependent reliability;  three-stage working mode;  Monte-Carlo simulation;  FNM method

PACS:

U416.21

DOI:

10.3969/j.issn.1003-7985.2009.02.022

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 forward to estimate the reliability of existing bridges.According to time-dependent reliability theory, subsequent service time is divided into several stages;minimum samples required by the Monte-Carlo method are generated by random sampling;training samples are calculated by the finite element method, and the training samples are extended by the neural network;failure probability and damage probability are calculated by the Monte-Carlo method.Thus, time dependent reliability indices are obtained, and the working status is judged.A case study is investigated to estimate the reliability of an actual bridge by the FNM method.The bridge is a CFST arch bridge with an 83.6 m span and it has been in operation for 10 years.According to analysis results, in the tenth year, the example bridge is still in safe status.This conclusion is consistent with the facts, which proves the feasibility of the FNM method for estimating the reliability of existing bridges.

References:

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Memo

Memo:

Biographies: Peng Keke(1978—), female, graduate;Huang Peiyan(corresponding author), male, doctor, professor, pyhuang@scut.edu.cn.
Foundation item: The National Natural Science Foundation of China(No.10672060).
Citation: 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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