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Rapid repair of severely earthquake-damaged bridge piers with flexural-shear failure mode

Earthquake Engineering and Engineering Vibration 2011年第4期10卷 553-567页

作者： Sun Zhiguo Wang Dongsheng Du Xiuli Si Bingjun Institute of Road and Bridge Engineering Dalian Maritime University Dalian 116026 China Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education Beijing University of Technology Beijing 100124 China School of Civil Engineering Dalian University of Technology Dalian 116024 China

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.

关键词： bridge piers rapid repair after earthquakes flexural-shear failure carbon fiber reinforced polymers （CFRP） cyclic testing

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