| The rocking pier with recoverable function is a new direction to improve the seismic performance of the bridge.In this paper,the rolling rocking pier with curved bottom is studied.Based on MATLAB platform,the restoring force and dynamic response of free rolling rocking pier and controlled rolling rocking pier with additional restrainers is studied by the combination of theoretical analysis and numerical calculation.The design scheme of restrainer parameters is proposed.The major work and results are as follows:(1)The restoring force of free rolling rocking pier with round bottom section and oval bottom section is investigated.Based on coefficient of restitution,the analysis method of collision effect is proposed.In addition,taking simply supported beam bridge with height difference between neighboring piers as research object,the curve equation of low pier bottom and different approximate solving method is suggested,ensuring the upper beam only translates when rocking.(2)The free rocking period and damping of free rolling rocking pier with round bottom section as well as the overturning condition and rocking response of the pier subjected to harmonic load are analyzed.25 near-fault pulse-like ground motion records and 25 far-fault ground motion records are selected.The rocking response and overturning law of pier subjected to different ground motions are discussed.(3)The rocking response of controlled rolling rocking bridge piers with elasticbrittle restrainers and elastic-plastic restrainers is researched.The influence of restrainer parameters on the overturning acceleration of pier when subjected to half cycle harmonic pulse and the selected 50 ground motions is also studied.(4)The comparison of the response of traditional consolidation pier and free rolling rocking pier subjected to the selected 50 ground motions is conducted.Then the influence of the restrainer parameters on the rocking response of the pier is analyzed.As a result,two restrainer design schemes are proposed.The results show that the restrainers can effectively control the displacement response of the pier top while increasing the overturning critical acceleration of bridge pier,further improving the seismic performance of the bridge pier. |
