Research On Shear Lag Effect And Webs Shear Distribution Of Three Cells Single Box Girder Bridge With Corrugated Steel Webs

The Box girder with corrugated steel webs is a kind of promising new bridge, which uses corrugated steel webs to replace the original concrete webs. This kind of box girder is mainly composed of upper and lower flanges. They assume the moment, while corrugated steel webs bear shear. Combined with the previous research results on the lag effect of corrugated steel web box and two different loading modes(external webs loading, internal webs loading) on the basis of symmetric bending load on the single box three cells girder, this paper analyzes the shear lag effect of box girder flange on single box three cells girder with corrugated steel webs, and study the web shear distribution pattern for further promoting this structure. The main works involved in this research are as follows.First, static test researching the single box three cells prestressed concrete girder with corrugated steel webs girder, and analyzing the test results with the finite element results.Second, the single box three cells girder has three symmetric loading modes. They are Four web loading, External webs loading, Internal webs loading mode. Analysing the relationship between this three and chose the load basis on this. Analysing characteristic of corrugated steel web composite box under two kinds of symmetrical loading mode of shear lag variation coefficient by using the finite element method.Third, exploring how the partition, the wide span ratio and the cells wide ratio effecting the shear lag effect. Suming up the rules of the shear lag effect of single box three cells girder with corrugated steel web, calculating the formula of maximum value on shear lag coefficient under two kinds of loading modes and analysing the calculation regression formula of effective distribution wide of the composite box girder with corrugated steel web.Fourth, external webs and internal webs has different shear under symmetric loading, they distributing the web shear based on the distribution mode belonging to their own loading mode. Discussing the shear distribution pattern on two kinds of loading modes of multi cells box girder with corrugated steel webs; obtaining shear distribution coefficient basis on the variable parameters such as the exist of median baffle plate, the web spacing, the web thickness and the constraint conditions and serving as a reference for engineering application.