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Earthquakes and Structures
  Volume 12, Number 2, February 2017, pages 201-211
DOI: http://dx.doi.org/10.12989/eas.2017.12.2.201
 


Seismic performance of RC bridge piers reinforced with varying yield strength steel
Junsheng Su, Rajesh Prasad Dhakal, Junjie Wang and Wenbiao Wang

 
Abstract
    This paper experimentally investigates the effect of yield strength of reinforcing bars and stirrups on the seismic performance of reinforced concrete (RC) circular piers. Reversed cyclic loading tests of nine-large scale specimens with longitudinal and transverse reinforcement of different yield strengths (varying between HRB335, HRB500E and HRB600 rebars) were conducted. The test parameters include the yield strength and amount of longitudinal and transverse reinforcement. The results indicate that the adoption of high-strength steel (HSS) reinforcement HRB500E and HRB600 (to replace HRB335) as longitudinal bars without reducing the steel area (i.e., equal volume replacement) is found to increase the moment resistance (as expected) and the total deformation capacity while reducing the residual displacement, ductility and energy dissipation capacity to some extent. Higher strength stirrups enhance the ductility and energy dissipation capacity of RC bridge piers. While the product of steel yield strength and reinforcement ratio (fyρs) is kept constant (i.e., equal strength replacement), the piers with higher yield strength longitudinal bars are found to achieve as good seismic performance as when lower strength bars are used. When higher yield strength transverse reinforcement is to be used to maintain equal strength, reducing bar diameter is found to be a better approach than increasing the tie spacing.
 
Key Words
    High-Strength Steel (HSS) reinforcement; HRB500E; HRB600; seismic performance; ductility; energy dissipation
 
Address
Junsheng Su,Junjie Wang: Department of Bridge Engineering, Tongji University, 1239 Siping Rd., Shanghai 200092, PR China

Junsheng Su, Rajesh Prasad Dhakal: Department of Civil and Natural Resources Engineering, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand

Wenbiao Wang: Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., 901 North Zhongshan No.2 Rd., Shanghai, 200093, PR China
 

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