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Structural Engineering and Mechanics
  Volume 70, Number 6, June25 2019 , pages 781-791
DOI: https://doi.org/10.12989/sem.2019.70.6.781
 


Analysis on damage of RC frames retrofitted with buckling-restrained braces based on estimation of damage index
Ruyue Liu and Yong Yang

 
Abstract
    Earthquakes most often induce damage to structures, resulting in the degradation or deterioration of integrity. In this paper, based on the experimental study on 5 RC frames with different span length and different layout of buckling-restrained braces, the seismic damage evaluation law of RC frame with buckling-restrained braces was analyzed, and then the seismic damage for different specimens was calculated using different damage models to study the damage evolution. By analyzing and comparing the observation in test and the calculated results, it could be found that, damage evolution models including Gosain model, Hwang model as well as Ou model could better simulate the development of damage during cyclic loading. Therefore, these 3 models were utilized to analyze the development of damage to better demonstrate the evolution law for structures with different layout of braces and under different axial compression ratios. The results showed that from all layouts of braces studied, the eccentrically braced frame behaved better under larger deformation with the damage growing slowly. It could be deduced that the link beam benefited the seismic performance of structure and alleviated the damage by absorbing high values of energy.
 
Key Words
    buckling-restrained braces; RC frame; damage analysis; damage index; cyclic loading
 
Address
Ruyue Liu: School of Civil Engineering, Fujian University of Technology, Fujian, China, 350118
Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Fuzhou, China
Yong Yang: Department of Civil Engineering, Xi
 

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