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

作     者：Sun Zhiguo Wang Dongsheng Du Xiuli Si Bingjun 

作者机构：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 

出 版 物：《Earthquake Engineering and Engineering Vibration》 (地震工程与工程振动（英文刊）)

年 卷 期：2011年第10卷第4期

页      面：553-567页

核心收录：

学科分类：08[工学] 0818[工学-地质资源与地质工程] 080104[工学-工程力学] 081402[工学-结构工程] 0815[工学-水利工程] 081304[工学-建筑技术科学] 0813[工学-建筑学] 0802[工学-机械工程] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Natural Science Foundation of China Under Grant No.51008041 and 50978042 the National Special Foundation of Earthquake Science of China Under Grant No.200808021 the Fundamental Research Funds for the Central Universities Under Grant No.2011JC011 

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

摘      要：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.