Concrete Shrinkage And Creep Of Concrete-filled Steel Tube Arch-beam Combination Of Structural Internal Force Redistribution

Beam-arch combination bridge with its stress characteristics of beam bridge andarch bridge, more and more get the favor of the bridge workers. In recent years, thebeam-arch combination bridge have mushroomed in bridge engineering practice,especially in large span railway bridges, and the four aspects showed strongcompetitiveness which the beam-arch combination bridge in safety, suitable,economicand beautiful. The concrete-filled steel tube arch bridge with its two at the same timesolve the application of high strength materials and construction, which obtained therapid development and application in our country. So the combination of concrete-filledsteel tube arch and girder bridge most used in beam-arch combination bridge, but inconcrete filled steel tubular composite arch structure design theory research has laggedfar behind with the engineering practice, and for the structure of the novel compositebridges performance study has important practical significance.In this paper, the following Concrete-Filled Steel Tube Arch-beam combinationBridge Guangyuan Jialing river bridge as an engineering background, the use of finiteelement software Midas/civil concrete shrinkage and creep full bridge simulationanalysis.In order to research the influence regular pattern of Shrinkage and creep ofconcrete for the structural deformation,internal forces and Section of stressredistribution of CFST Arch-beam combination bridge.①The deflections of the girders in the construction stage by shrinkage and creepeffect of concrete greatly, however, the effect is small after the completion of thebridge; Concrete-Filled Steel Tube Arch deflection in the effects of shrinkage andcreep, changes very little.②It is small that The effects of shrinkage and creep of concrete for main beamstructure forces,but it has great influence on the shear force and bending moment forarch foot.③The influence is not obvious that shrinkage and creep of concrete affect on BeamSectional longitudinal stress. Longitudinal section stress will appear almost constantlydecreasing trend,but the value of stress and the scale is changed not large.The shrinkageand creep of pipe concrete makes a significant section stress redistribution in theCFST arch.As a result, steel pipe section stress will become bigger and bigger,however,steel pipe concrete sectiong stress will become smaller and smaller. Carring out on the parameters of CFST arch-beam combination bridge shrinkageand creep analysis, to explore different shrinkage and creep effects under the differentfloor system dead loads, steel section stiffness.The larger floor system dead loads, themore obvious shrinkage and creep effect; different steel section stiffness, shrinkage andcreep performance will vary greatly.