| Through theoretical analysis and finite element analysis, this dissertation makes research on dynamic characteristic of concrete box-girder with corrugated steel webs.The solid element calculation models of two concrete tested box-girders with corrugated steel webs are built by MIDAS finite element analysis programm, and their dynamic characteristics are analyzed. The difference between experimental values and FEA values are analyzed and the precision and applicability of finite element method are proved.A formula for calculating the frequency of externally prestressed simply supported concrete beam, which is derived from classical frequency equation considering the influence of external tendons, is used to calculate the natural frequency of a test box girder with corrugated steel webs, with considering the characteristics of the section of box girder with corrugated steel webs. The results of the natural frequency before prestressed, after prestressed by every group of external tendons and considering the influence of the prestress loss are all included.Finally, based on energy variation principle, the method to calculate the vibration of simply suppored box girder is improved to calculate the natural frequency of box girder with corrugated steel webs, which includes the effect of shear lag and shear deformation.
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