Journal of South China University of Technology (Natural Science Edition) ›› 2019, Vol. 47 ›› Issue (1): 64-74.doi: 10.12141/j.issn.1000-565x.180166

• Architecture & Civil Engineering • Previous Articles     Next Articles

Fragility Analysis of High-pier and Long-span Continuous Rigid Frame Bridge Based on Double Effects of the Actual Site and Collision
 

 ZHAO Jingang1 JIA Hongyu2 LI Xi2 ZHAN Yulin2， 3 LI Lanping2   

  1.   1． College of Civil Engineering，Guizhou University，Guiyang 550025，Guizhou，China; 2． School of Civil Engineering，Southwest Jiaotong University，Chengdu 610031，Sichuan，China; 3． National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation，Chengdu 610031，Sichuan，China
  • Received:2018-04-03 Revised:2018-06-19 Online:2019-01-25 Published:2018-12-01
  • Contact: 贾宏宇( 1981) ，男，博士，副教授，主要从事桥梁结构抗震性能分析研究 E-mail:Hongyu1016@swjtu.edu.cn
  • About author:赵金钢( 1984) ，男，博士，讲师，主要从事高墩桥梁地震易损性研究
  • Supported by:
     Supported by the National Natural Science Foundation of China( 51308465，51878564，11602061) ; the National Key Ｒesearch and Development Program of China( 2016YFB1200401) and the Science and Technology Planning Project of Sichuan Province( 2017GZ0369，2018GZ0052) ． 

PDF

200

Abstract: The influence of the double effects of actual site and collision on the fragility of high-pier and long-span continuous rigid frame bridge was studied． A real high-pier and long-span continuous rigid frame bridge was taken as the research object，and some finite element models of the bridge were built for the various separation distances between deck and abutment based on the OpenSees software． And the bedrock seismic waves were converted into surface seismic waves according to the filtration of actual soil characteristics at the bridge location for incremental dynamic analysis ( multi-support excitation) ． The results were compared with the structural responses which do not consider the effect of actual soil filtration ( uniform excitation) ． The results show that with the increase of the width of expansion joint，the damage probability of Pier 2# ( second highest pier) under the uniform excitation is gradually becoming larger than that of multi-support excitation with the maximum difference of 0. 28． The collision effect reduces the damage probability of Pier 3# ( the highest pier) ，and the uniform excitation method underestimates the damage probability of Pier 3# in each damage stage，with an underestimation up to 0. 35． With the increase of peak acceleration of bedrock seismic wave，the probability demand value of displacement ductility coefficient of Pier 2# under the uniform excitation is gradually growing larger than that of the multi-support excitation，while the probability demand values of displacement ductility coefficient of Pier 3# under multi-support excitation are all larger than those of uniform excitation． The influence of the double effect of actual site and collision on the fragility of bridge structures depends on the heights of piers of long-span continuous rigid-frame bridge，so it should be considered synthetically in seismic design of bridge． 

Key words: site effect, collision effect, high-pier and long-span continuous rigid frame bridge, pedestal earthquake wave, peak ground acceleration, fragility analysis, damage probability

CLC Number: