Effect of Pier Section Type on Seismic Response of Curved Continuous Rigid Frame Bridge

In order to study the influence of pier section on the dynamic and seismic responses of curved continuous rigid frame bridge,a current bridge was taken as an example,and its finite element model was set up to analyze three parameters' effects on the structure's natural vibration characteristics.The parameters include external dimensions,section area and section longitudinal rigidity of the pier.Then liner elastic time history analysis method was adopted to deduce the effects of the parameters on the seismic response of hollow pier or solid pier structure.The results show that the mode shape sequence changes with different section types of the pier:for the continuous rigid frame bridges,(1) if the external dimensions of the hollow pier is the same to that of the solid pier,the frequencies of the former are lower than those of the latter;(2) if the section areas of the two kinds of pier are the same,the frequencies of the former are higher than those of the latter;(3) if the two kinds of pier have the same longitudinal rigidity,the seismic response of the former is basically as same as that of the latter.(4)under the earthquake excitation,the stress at the bottom of the hollow pier and the displacement of the superstructure are less than those of bridge with solid pier.