Seismic Performance Analysis Of Long-span Continuous Rigid Frame Bridge With High Piers

In this paper,aiming at the problem of seismic performance of continuous rigid frame bridge under the influence of different factors,taking a continuous rigid frame bridge as the supporting project,the seismic performance of continuous rigid frame bridge is systematically studied and discussed.The main work is as follows: first,the theoretical basis of seismic response analysis is elaborated in detail,according to the code,carries out static checking calculation and seismic checking calcu lation for the project;then taking the water depth,pile-soil effect and pier form(single and double thin-walled piers)as the change parameters,desgns the contrast model respectively for the three change parameters,and studies the influence of water d epth,pile-soil effect and pier form on the dynamic characteristics of the structure;finally,the static elastoplastic analysis of the structure is carried out by different loading methods,and the seismic performance of the structure is evaluated.The main conclusions are as follows:(1)With the increase of water depth,the natural frequency of the structure will decrease,the seismic response will increase,and the high-order vibration mode of the structure is more sensitive to water depth(2)If the pile-soil effect is not considered and the consolidation model of pier bottom is adopted directly,the calculation results will be too conservative,resulting in waste of resources;(3)The results show that the double thin-walled hollow pier can effectively reduce the seismic response of the structure along the bridge direction(4)In Pushover analysis,the shear force calculated by SRSS loading method and inverted triangle loading method is smaller in the along bridge direction.