Abstract

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Title:: Influence of Pile-pier Reinforcement Ratio on Plastic Hinge Length of Bridge Structure

Author(s):: SONG Bo; LI Kai-wen; HUANG Shuai; School of Civil and Environmental Engineering, University of Science and Technology Beijing

Keywords:: bridge structure; seismic wave; plastic hinge length; reinforcement ratio; pile-soil interaction; pier; pile foundation

Abstract:: Using elastic-plastic fiber unit model for a continuous beam bridge structure and pile foundation, the nonlinear seismic response of pier and pile foundation considering pile-soil interaction was carried out and influences of the dynamic response of pier and pile foundation under different types of seismic waves were analyzed. The development of plastic zone and dynamic response of structure under different pile-pier reinforcement ratios were emphatically studied. The results show that with the pile-pier reinforcement ratio change, the response plastic ratios of pier and pile foundation show different trends; pile-pier reinforcement ratio is an important factor of affecting dynamic characteristics of the bridge pier supported by group pile systems; the pier reinforcement ratio not only impacts on development of plastic zone of the pier, but also impacts greatly on the pile foundation. In addition, different types of seismic waves have different effects on the dynamic responses for bridge pier structure with group pile foundation, and the longperiod seismic waves are maximum, followed by inland direct seismic waves, plate boundary seismic waves are minimum.