Abstract
In order to accurately analyze the bending vibration frequency of the new composite box girder, the effects of web folding effect, shear lag, and shear deformation are comprehensively considered in this paper, and the elastic control differential equation and natural boundary conditions of the composite box girder are established by using the Hamilton principle. A one-span composite box girder with corrugated steel webs is used as a numerical example. The effects of height span ratio, width span ratio, web thickness, cantilever plate length, and fold effect on the vertical vibration frequency of the new composite box girder are analyzed. The results show that the analytical solution is in good agreement with the finite element solution. When considering the shear lag and fold effect, the vibration frequency of composite box girder decreases. With the increase in order, the influence of shear lag and fold effect on its frequency becomes stronger. The changes of height span ratio and web thickness of composite box girder have a great influence on its folding effect, while the changes of width span ratio and cantilever plate length have little influence on it. The conclusion can provide a reference for the design of medium section new composite bridge in practical engineering.
Highlights
Corrugated steel web bridge is a kind of composite structure bridge appeared at the end of the twentieth century [1,2,3,4,5]
In order to improve the construction progress, further reduce the self weight of the structure, and enhance the seismic performance of the bridge structure, bridge workers have proposed the design of a new composite box girder bridge by replacing the traditional corrugated steel web composite box girder bottom plate (RC plate) with flat steel plate. e self weight of this kind of structure is reduced by more than 50% compared with the traditional corrugated steel web composite box girder and makes full use of the characteristics of compression of concrete roof, tension of steel bottom plate, and high shear yield strength of corrugated steel web
There is no clear calculation method for the natural vibration frequency of this type of bridge in the relevant specifications, which shows that the bridge workers still have a lack of understanding of the mechanical properties of this new corrugated steel web composite box girder bridge
Summary
Corrugated steel web bridge is a kind of composite structure bridge appeared at the end of the twentieth century [1,2,3,4,5]. In order to improve the construction progress, further reduce the self weight of the structure, and enhance the seismic performance of the bridge structure, bridge workers have proposed the design of a new composite box girder bridge by replacing the traditional corrugated steel web composite box girder bottom plate (RC plate) with flat steel plate. E self weight of this kind of structure is reduced by more than 50% compared with the traditional corrugated steel web composite box girder and makes full use of the characteristics of compression of concrete roof, tension of steel bottom plate, and high shear yield strength of corrugated steel web. According to the current external environmental conditions and the characteristics of the bridge, the method used in this paper enriches and develops the analysis theory of this kind of structure and has certain guiding significance for the design of new corrugated steel web composite beam structure
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