Experimental investigations on seismic responses of RC circular column piers in curved bridges

Chiyu Jiao, Jianzhong Li, Biao Wei, Peiheng Long and Yan Xu

Abstract

The collapses of curved bridges are mainly caused by the damaged columns, subjected to the combined loadings of axial load, shear force, flexural moment and torsional moment, under earthquakes. However, these combined loadings have not been fully investigated. This paper firstly investigated the mechanical characteristics of the bending-torsion coupling effects, based on the seismic response spectrum analysis of 24 curved bridge models. And then 9 reinforced concrete (RC) and circular column specimens were tested, by changing the bending-tortion ratio (M/T), axial compression ratio, longitudinal reinforcement ratio and spiral reinforcement ratio, respectively. The results show that the bending-torsion coupling effects of piers are more significant, along with the decrease of girder curvature and the increase of pier height. The M/T ratio ranges from 6 to 15 for common cases, and influences the crack distribution, plastic zone and hysteretic curve of piers. And these seismic characteristics are also influenced by the compression ratio, longitudinal reinforcement ratio and spiral reinforcement ratios of piers.

Key Words

curved bridge; earthquake; bending moment; torsion coupling; seismic analysis; pseudo-static test

Address

Chiyu Jiao: Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, 1 Exhibition Hall Road, Beijing, China; State Key Laboratory of Disaster Prevention in Civil Engineering, Tongji University, 1239 Siping Road, Shanghai, China; Engineering Structure and New Materials Research Center of Beijing Higher Education Institutions, Beijing University of Civil Engineering and Architecture, 1 Exhibition hall Road, Beijing, China Jianzhong Li: State Key Laboratory of Disaster Prevention in Civil Engineering, Tongji University, 1239 Siping Road, Shanghai, China Biao Wei: School of Civil Engineering, Central South University, 22 Shaoshan South Road, Changsha, China Peiheng Long: Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, 1 Exhibition Hall Road, Beijing, China; Engineering Structure and New Materials Research Center of Beijing Higher Education Institutions, Beijing University of Civil Engineering and Architecture, 1 Exhibition hall Road, Beijing, China Yan Xu: State Key Laboratory of Disaster Prevention in Civil Engineering, Tongji University, 1239 Siping Road, Shanghai, China

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