Damage localization method for simply supported bridge with flexural stiffness uncertainty considered
Date of Issue2015
School of Civil and Environmental Engineering
In order to deal with flexural stiffness uncertainty of main girder and then localize the damage of main girder for simply supported bridges accurately, a damage localization index based on the idea of second order difference of displacement influence line－difference index of influence line for mid-span displacement (DIILMSD), was presented by employing influence line analysis. Only the incremental vertical displacement of the mid-span under mobile load needed to be measured by using this index. Subsequently, the damage localization method based on DIILMSD was established. The results show that the damage positions of actual main girders with local flexural stiffness uncertainty can be effectively detected by comparing two DIILMSD graphs before and after damage. If the slopes of two attachment lines between one point (x2=x'+m) and its two adjacent points change, it can be known that damage occurs within the region [x',x'+m] or [l- x'- m,l- x']. In addition, the effect of damage localization can be adjusted by changing the value of load.
China journal of highway and transport
© 2015 China Journal of Highway and Transport. This paper was published in China Journal of Highway and Transport and is made available as an electronic reprint (preprint) with permission of China Journal of Highway and Transport. The paper can be found at the following official URL: http://zgglxb.chd.edu.cn/CN/abstract/abstract2000.shtml. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.