Shaking table test design of special irregular arch bridge
Shaking table test is an effective means to study the complex dynamic characteristics and seismic response of large structures,and it is the key to desigh the scale model structure in the shaking table test due to the limitation of shaker size and load.Based on the dimensional similarity method and elastic similarity law,the geometric similarity ratio of 1∶20 was taken,and the design of the dynamic scale model of key parameters was carried out using a spatial special-shaped arch bridge as the prototype.Firstly,through finite element numerical analysis,the dynamic characteristics,internal forces and displacements of the original bridge model and the scaled bridge model under dynamic action are analyzed to verify the rationality of the scaled model.Under the selection of reasonable seismic action,the structural time history response analysis was carried out.The calculation results show that the scaled model bridge is completely consistent with the first tenth-order mode of the prototype bridge with the frequency error less than 7%,the response error of internal force,displacement and acceleration of the key section has not exceeded 10%,and the scaled model bridge can reflect the dynamic characteristics and response characteristics of the original bridge.This research work can provide technical support for the seismic design of shaking table of space irregular arch bridge,and provide reference for shaking table tests of similar bridges.
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维普
