Study Of Dynamic Characteristics Of Corrugated Steel Webs Of Concrete Box Girder

Through finite element analysis and experimental study, this dissertation makes systematical 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 real sectional dimensions and material characteristics are obtained after the tested box-girders have been built; the solid element calculation models of two concrete tested box-girders with corrugated steel webs are rebuilt, and the influence of the construction on their dynamic characteristics is analyzed.The experimental values are got by doing dynamic test on the test box-girders. The difference between experimental values and FEA values are analyzed and the precision and applicability of finite element method are proved.Sensitivity analyses of concrete box-girder with corrugated steel webs to geometric parameters are analyzed by finite element method. The diversification rules of concrete box-girder with corrugated steel webs on dynamic characteristic are disclosed when geometric parameters are changed, and the results can be applied for bridge design and avoiding the bad factors caused by dynamic loads.Finally, the theoretical analysis method of torsional vibration of concrete box-girder with corrugated steel webs is established; and when the diaphragm is set in concrete box-girder with corrugated steel webs, the theoretical analysis method of torsional vibration is established also. The influence rules on torsional vibration of concrete box-girder with corrugated steel webs caused by the set position, thickness and quantity of diaphragms are researched by theoretical analysis method and finite element method, and they can be applied for bridge design.