Research on Transverse Mechanical Behavior of Top Slabs of Precast,Simply-Supported,Double Cell Box Girder with Corrugated Steel Webs
This research investigates the relationship between the precast segmental construction method and the transverse mechanical behaviors of top slabs of the simply-supported double cell box girder with corrugated steel webs.With the case of Sandaohe Bridge in Qinghai Province,two 1∶3 scale specimens were prepared for static failure test,one was an integrally-cast box girder(the"integral girder"hereafter)and the other was a precast segmental girder(the"segmental girder"hereafter).The two specimens were tested under four loading conditions,including the symmetric and eccentric loading along the girder width as well as the single-point and double-point loading along the girder length,to analyze the relationship between loads and displacements,and the relationship between loads and transverse strain as well.Finite element modeling and theoretical analysis were conducted to study the variation of transverse internal forces and effective distribution width of top slabs as well as the influence of number of diaphragms on the transverse internal forces of top slabs,when the girders were loaded at different locations along the width.It is shown that the transverse strain variation in the segmental girder is basically the same as that in the integral girder,but with bigger values.The tested effective distribution width of the segmental girder approximates that by the finite element modeling,with a differential less than 9％,but all bigger than the values suggested by Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts(JTG 3362-2018).In terms of transverse stress,the theoretical value is bigger than both the tested and modeled values.Adding diaphragms can lead to significant reduction of the transverse stress of the segmental girder.The application of the precast segmental construction method is not limited by the transverse mechanical behavior and deformation of the structure,which is more environment-friendly than the conventional cast-in-situ method.
simply-supported girder bridgeintegral in-situ castingprecast segmental constructioncomposite box girder with corrugated steel webstransverse internal forceeffective distribution widthmodel testfinite element method
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维普
