Finite Element Simplified Computation for Dynamic Characteristics of Cable-stayed Bridge Girder with Opening Section

Taking a large span cable-stayed bridge with opening section as example,comparing and analyzing three simplified models in computing differences of the dynamic characteristics in opening section,an appropriate computation model for them was recommended.The results show that for each order of the longitudinal drift,lateral bending and vertical bending inherent dynamic characteristics,the results of single-girder model,girder shell element model and triple-girder model are basically consistent.The calculation results of the dynamic characteristics of the three models for seismic analysis are little difference,but single-girder model will underestimate the torsional stiffness and will cause large errors of bridge torsional frequency.The results of triplegirder model and girder shell element model are similar,and single-girder model should not be used when analyzing wind-resistant design of bridges.