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Structural Engineering and Mechanics
  Volume 55, Number 6, September25 2015, pages 1139-1155
DOI: http://dx.doi.org/10.12989/sem.2015.55.6.1139
 


Experimental study on seismic behavior of reinforced concrete column retrofitted with prestressed steel strips
Bo Zhang, Yong Yang, Yuan-feng Wei, Ru-yue Liu, Chu Ding and Ke-qiang Zhang

 
Abstract
    In this study, a new retrofitting method for improving the seismic performance of reinforced concrete column was presented, in which prestressed steel strips were utilized as retrofitting stuff to confine the reinforced concrete column transversely. In order to figure out the seismic performance of concrete column specimen retrofitted by such prestressed steel strips methods, a series of quasi-static tests of five retrofitted specimens and two unconfined column specimen which acted as control specimens were conducted. Based on the test results, the seismic performance including the failure modes, hysteresis performance, ductility performance, energy dissipation and stiffness degradation of all these specimens were fully investigated and analyzed. And furthermore the influences of some key parameters such as the axial force ratios, shear span ratios and steel strips spacing on seismic performance of those retrofitted reinforced concrete column specimens were also studied. It was shown that the prestressed steel strips provided large transverse confining effect on reinforced concrete column specimens, which resulted in improving the shearing bearing capacity, ductility performance, deformation capacity and energy dissipation performance of retrofitted specimens effectively. In comparison to the specimen which was retrofitted by the carbon fiber reinforced plastics (CFRP) strips method, the seismic performance of the specimens retrofitted by the prestressed steel strips was a bit better, and with much less cost both in material and labor. From this research results, it can be concluded that this new retrofitting method is really useful and has significant advantages both in saving money and time over some other retrofitting methods.
 
Key Words
    prestressed steel strip; retrofitted methods; reinforced concrete column; seismic performance; quasi- static tests; experimental research
 
Address
Bo Zhang: College of Civil Engineering, Xi\'an University of Architecture & Technology, Xi\'an 710055, China; Department of civil Engineering & Architecture, Shaanxi University of Technology, HanZhong 723001, China
Yong Yang, Yuan-feng Wei, Ru-yue Liu: College of Civil Engineering, Xi\'an University of Architecture & Technology, Xi\'an 710055, China
Chu Ding: Department of Civil & Environmental Engineering, Virginia Tech, Blacksburg, VA 24060, USA
Ke-qiang Zhang: Department of civil Engineering & Architecture, Shaanxi University of Technology, HanZhong 723001, China
 

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