Journal of South China University of Technology (Natural Science Edition) ›› 2018, Vol. 46 ›› Issue (6): 48-53.doi: 10.3969/j.issn.1000-565X.2018.06.007

• Traffic & Transportation Engineering • Previous Articles     Next Articles

Condition Assessment Method of Suspension Bridges Using Time-dependent Variable Weight Model
 

 XU Xiang1， 2， 3 REN Yuan1， 2 HUANG Qiao1， 2 SUN Hongbin4   

  1.  1． School of Transportation，Southeast University，Nanjing 210096，Jiangsu，China; 2． Key Lab of Transport Infrastructure Security Ｒisk Management of Transport Industry，Nanjing 210096，Jiangsu，China; 3． Department of Civil and Environmental Engineering， University of Waterloo，Waterloo N2L3G1，ON，Canada; 4． Jiangsu Yangtze Bridge Ltd，Taizhou 214500，Jiangsu，China
  • Received:2017-11-30 Revised:2018-02-05 Online:2018-06-25 Published:2018-05-07
  • Contact: 黄侨( 1958-) ，男，博士，教授，主要从事大型桥梁安全运营与维护研究． E-mail:qhuanghit@126.com
  • About author:许翔( 1989-) ，男，博士生，主要从事大跨径缆索承重桥梁评估研究
  • Supported by:
     Supported by the National Natural Science Foundation of China( 51208096) and the Key Science and Technology Project of Jiangsu Transport Department( 2014Y02) 

PDF

362

Abstract: To highlight time-variant characteristics of indexes for bridge assessment process，a time-dependent variable weight approach is proposed． Initially，a typical variable weight model corresponding to the sum type balance function is established． In addition， index weights of suspension bridge superstructures are taken as an example to investigate the relationships between weights of replaceable/permanent members and operation time． Then，assessment results of the constant weight model，factor-based variable weight model，and time-＆ factor-based variable weight model for a suspension bridge are compared with each other． The results show that the assessment result of the time-＆ factor-based variable weight model mostly agrees with the actual condition of the studied bridge． It is concluded that index weights of replaceable members significantly gain in the end of their lives and have a periodicity with a period of the member service life; while，index weights of permanent members gradually increase over time． The time-dependent variable weight algorithm can adjust initial weights according to bridge operation time， which makes up the drawbacks of the factor-based variable weight model where satisfactory weight adjustment is unavailable on account of the low initial index weights． 

Key words: suspension bridge, bridge assessment, constant weight model, factor-based variable weight, time-dependent variable weight

CLC Number: