|Table of Contents|

Vulnerability evaluation of cable stayed bridge considering cable damage(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年6期
Page:
101-109
Research Field:
桥梁工程·交通基础设施智能化运维技术专栏
Publishing date:

Info

Title:
Vulnerability evaluation of cable stayed bridge considering cable damage
Author(s):
MA Ya-fei;  LI Zuo;  PENG An-yin;  WANG Lei;  ZHANG Jian-ren
(School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China)
Keywords:
bridge engineering;  cable-stayed bridge;  cable damage;  mechanical property;  safety factor;  vulnerability
PACS:
TU375
DOI:
10.19721/j.cnki.1671-8879.2022.06.010
Abstract:
The vulnerability of long-span cable-stayed bridges under different degrees of cable damage was investigated based on the Second Hejiang Yangtze River Bridge in Sichuan Province. Finite element(FE)method was used to analyze the mechanical performance of structures. Seven pairs of representative cables of the entire bridge were selected to investigate the mechanical performance changes of cables, pylons, and main beams under various levels of cable damage. The variation laws of cable stress safety factor, bridge pylon stress safety factor, buckling and stress safety factors of main beam under different damage degrees were revealed. Based on the results of FE method, the cross-efficiency data envelope analysis method was used to determine the location of vulnerable cables. The cable section area and equivalent elastic modulus were regarded as the model input parameters and the four safety factors as output parameters. Combined with the entropy analytic hierarchy process method, the partial weights of the four safety factors can be obtained by decision-making and raw data evaluation, which can reflect the evaluation focus and weaken the adverse impact induced by the difference between different type values. The results show that long cable damage leads to more obvious variation amplitude of cable stress, main girder bending moment and pylon displacement. With the increase of the length of the damaged cable, the reduction of safety factor increases significantly. The cables near the side pier and middle span have a significant effect on the structural performance. The sensitivity of structure to mid span cable damage was higher than that of side span cable damage, and the damage vulnerability of long cable was higher than that of short cable. It can provide a reference for the critical areas monitoring of cable-stayed bridges.1 tab, 11 figs, 23 refs.

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Last Update: 2022-12-20