Analysis And Optimization Of The Structure For Composite Box Girders With Corrugated Steel Webs

The composite bridge is favored with the developmental goal of "light weight, high strength, long-span" for modern bridge engineering. As a type of composite steel-concrete structure, the composite box girder with corrugated steel webs is economical, efficient, and easy to construct. It improves the efficiency of structural stability, strength and material because it is appropriate to combine the steel with the concrete of two different materials. Assuming the structure to meet current research assumes when do the research and analysis of this article:1. Corrugated steel web collaborative force with concrete, and slip or shear failure does not occur.2.The longitudinal bending of section box girder in line "to be plane assumption" when analyzing the overall mechanical performance.3.Ignoring the role of corrugated steel webs’ vertical bending. Then the moment only to be resisted by the roof and floor which were constituted of concrete.4.The shear entirely borne by the corrugated steel web and the shear stress is evenly distributed over the web.To tie in construction work with a continuous girder bridge with corrugated steel webs construction work. The main study of this paper are as follows:1.In the engineering background of composite box-girder with corrugated steel webs. Building space finite element model with MIDAS/Civil, then doing the analysis of stress and deformation of concrete for construction control.2.Establishing 0 # and 1 # block local model by MIDAS/FEA to study the shear elastic buckling of corrugated steel webs. Using the method of control variables to talk about the geometric parameters of corrugated steel webs. By analyzing the results showed that:Increasing the thickness of the corrugated steel webs can effectively improve the shear strength; Changing the length of the straight segment has little effect on the buckling stress, usually make the straight segment 100mm～450mm to prevent occurrence bucking failure of local in web; Increasing the corner of the twists and turns can significantly improve the buckling strength of the structure.