Experimental Study on Wind Resistance of Long-Span Steel Box Composite Girder Bridge with Long Cantilevers
The study focuses on the wind resistance of the long-span steel box composite girder bridge with long cantilevers and the proper noise barriers for such type of bridge.The Linyi Huanghe River Bridge,which is a steel box composite girder bridge featuring its 7.5 m-wide cantilevers,is used as a case.The dynamic properties of the bridge during construction and at service stage were numerically simulated.A 1∶50 sectional models of the steel box composite girder under construction and two 1∶60 sectional models of steel box girders with 2.5 m-deep straight and polyline noise barriers,respectively,at service stage,were prepared for wind tunnel tests,to analyze the vortex-induced vibrations(VIVs),flutter and galloping performance of the superstructure during construction and at service stage.It is shown that the steel box girders exhibited sound wind resistance during construction,with required capacities to resist VIVs,flutter and galloping.At wind attack angles of 0°,+3°and-3°,significant VIVs were observed in the superstructure fitted with 2.5 m-deep straight noise barriers,while the superstructure fitted with 2.5 m-deep straight noise barriers showed suppressed vortex-induced vibrations,and sound flutter and galloping stability.The 2.5 m-deep polyline noise barriers were finally selected for the Linyi Huanghe River Bridge.
steel box composite girderlong cantileversectional modelnoise barriervortex-induced vibrationfluttergallopingwind tunnel test
万方数据
维普
