Experimental Study on Loading Features of Continuous Rigid-Frame Bridge with Corrugated Steel Webs

Abstract

Two comparison models of single cell box variable cross-section continuous rigid frame bridge with corrugated steel webs and the equivalent ordinary concrete continuous rigid frame bridge were designed and constructed. The loading features are contrastively researched. The results show that with same loading condition, strain of roof and floor of box girder with corrugated steel webs is increased when the load is increased, while the strain value of corrugated steel web is very low and nearly unchanged when the load is increased. The bending stiffness of box girder with corrugated steel webs was main supply with roof and floor and the bending stiffness is lower than box girder with concrete webs. Continuous rigid-frame bridge with corrugated steel webs box girder integrated the advantages of rigid-frame bridge and box girder with corrugated steel webs. This new structure has larger span capacity; lighter self-weight, excellent seismic performance and higher effective prestressing system, etc, which is suitable for large span bridge in high seismic intensity[1]. Static characteristics of box girder with corrugated steel webs have been further researched with theory and test method by foreign scholars[2-4]. On the aspect of bending performance, the damage characteristics of simply supported box girder bridge with corrugated steel webs have been researched[5]. Three simply supported box girder bridge with corrugated steel webs have been designed and constructed to research it’s static effect[6]. The applicability of “Quasi plane assumption” has been verified with FEA method and model test of simply supported box girder bridge with corrugated steel webs[7]. Ignoring the bending contributions of corrugated steel web, the calculation formula of ultimate bearing capacity of box beam is deduced[8]. Combined with the model test and the FEA method, the calculation formula of normal stress and shear stress of box girder bridge with corrugated steel webs are deduced[9]. Considered the shear slip of shear key between the corrugated steel webs and the roof and floor concrete, the formulas of the ultimate flexural capacity of the externally prestressed box girder with corrugated steel webs were derived[10]. On the aspect of inner lining concrete research, the method of shear calculation of steel concrete composite segment is researched with contrasting of shear distribution method of steel concrete combination[11]. The impact of the thickness of concrete lining to the shear bearing capacity of the corrugated webs was analyzed via theoretical calculation and finite element analysis[12]. In summary, a large number of theory and experimental research on prestressed concrete box girder with corrugated steel webs at home and abroad, but most of model test are simply supported box girder bridge, very few are continuous box girder. In this paper, the loading features are contrastively researched depend on the model of continuous rigid frame bridge with corrugated steel webs and the equivalent ordinary concrete continuous rigid frame bridge.