The Theoretical Research Value For Corrugated Steel Webs Of The Effective Flange Width

Compared to traditional prestressed concrete box girder, on behalf of the newexternal prestressing steel corrugated steel webs combination of a concrete box beamstructure with a combination of reduced structural weight, a decrease of25%to30%,good seismic performance, appearance, saving advantages of building materials and so on.Because of the corrugated steel web composite box girder to give full expression to theadvantages of steel and concrete composite beams, especially for weight and large spanbridge beam section height low Bridges more highlights its advantages. Corrugated steelweb composite box girder with larger application range, suitable for common promotionand application in engineering.For the corrugated steel web composite box girder design, reasonable to determinethe effective width of concrete flange is critical. Its value directly affect the bearingcapacity and deflection of composite beams. Because of the influence of the concreteflange on the shear lag, the longitudinal stress decreases with increasing distance from thebeam spot. Today the bridge specification usually define "effective width" is used to solvethe problem and fill the specification in our country in the aspect of calculation of boxgirder the effective flange width of blank, and on the effective width is the use ofenvironmental regulation, for the actual design play a constructive role.For flexural member is the concept of effective width of flange "pressure". Bearingcapacity limit state of component bearing capacity calculation, considering effectivewidth bending effect, pressure effect regardless of the effective width. For serviceabilitylimit states of the crack, crack width and deflection calculation of the effective width.Using phase to compressive stress calculation, the concrete method of normal sectionbending effect considered effective width, pressure effect is not considered effectivewidth. But the specification is the same value of the effective flange width of box beamsof suitable shape steel web wavelengths, this special structure remains to be proven. Inaddition, many complicated factors influencing the effective width values of, due totechnical problems such as funds, used to the effective width of corrugated steel webplate is difficult to conduct a comprehensive in-depth research accurately.Based on the static experimental study as the starting point, the integrated structuralcharacteristics of composite box girder with corrugated steel webs, through observationand analysis of the monitoring data model stage such as deformation performance,control section strain in each other, and then summarize the stress and strain distributionof composite box girder with corrugated steel webs wing plate. In view of the abovesituation, the finite element analysis software ANSYS numerical simulation of the stress-deformation process model, which can provide the basis for further analysis. In order to analyze the influence of different parameters on the composite box girder with corrugatedsteel webs and concrete flange effective width, this paper identifies many differentcomposite box girder with corrugated steel webs with different model, structure system,the load type, geometric parameters such as changes in the index, so as to systematicallyexplore value of effective width.At the end of the paper when comparing specification for corrugated steel webcomposite box girder on the basis of effective flange width values, according to theresults of the series of finite element simulation analysis is put forward in the actualdesign of the existing bridge gauge is used to calculate the corrugated steel webcomposite box girder concrete is the effective distribution width of flange should be safe,can be used for reference in the engineering calculation.