Rapid repair of severely earthquake-damaged bridge piers with flexural-shear failure mode |
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| Authors: | Zhiguo Sun Dongsheng Wang Xiuli Du Bingjun Si |
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| Institution: | [1]Institute of Road and Bridge Engineering, Dalian Maritime University, Dalian 116026, China [2]Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education, Beijing University of Technology, Beijing 100124, China [3]School of Civil Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | An experimental study was conducted to investigate the feasibility of a proposed rapid repair technique for severely earthquake-damaged
bridge piers with flexural-shear failure mode. Six circular pier specimens were first tested to severe damage in flexural-shear
mode and repaired using early-strength concrete with high-fluidity and carbon fiber reinforced polymers (CFRP). After about
four days, the repaired specimens were tested to failure again. The seismic behavior of the repaired specimens was evaluated
and compared to the original specimens. Test results indicate that the proposed repair technique is highly effective. Both
shear strength and lateral displacement of the repaired piers increased when compared to the original specimens, and the failure
mechanism of the piers shifted from flexural-shear failure to ductile flexural failure. Finally, a simple design model based
on the Seible formulation for post-earthquake repair design was compared to the experimental results. It is concluded that
the design equation for bridge pier strengthening before an earthquake could be applicable to seismic repairs after an earthquake
if the shear strength contribution of the spiral bars in the repaired piers is disregarded and 1.5 times more FRP sheets is
provided. |
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| Keywords: | bridge piers rapid repair after earthquakes flexural-shear failure carbon fiber reinforced polymers (CFRP) cyclic testing |
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