Study On The Mechanical Characteristics Of Concrete Filled Steel Tube Web Member PC Composite Girder Bridge

The mid-1980s of the last century, In order to solve the major problem that greatweight of traditional prestressed concrete box bridge, French scholar put forward forthe first time about steel truss web member PC composite girder bridge, the upperroof and the bottom plate of the bridge that participate in the truss shear, the stresscondition of bridge is improved and greatly reduces the overall bridge section size,saves the amount of steel, and effectively reduce the weight upper structure of bridge.With the development of bridge engineering, the requirement of long-spanbridges is more and more intense, so as compressive capacity of steel tubular trussWeb members have higher requirements, according to this requirement, this paperputs forward a kind of method, this paper puts forward a structure of concrete filledsteel tube web member PC composite girder bridge.The first part of this paper, made a thorough research for composite bridge,especially for steel truss web member PC composite girder bridge.The second part of this paper, it is studied deeply on the analysis method ofconcrete filled steel tube web member PC composite girder bridge. Through thecomparison of traditional methods and new method of analysis, put forward spaceshell-beam of analysis that suitable for concrete filled steel tube web member PCcomposite girder bridge. Explore the finite element model suitable for this methodbased on shell-beam of analysis. After in-depth analysis and research, it is concludedthat is applied to the analysis of the finite element model of the bridge structure: thespace shell-beam finite element analysis mode.The third part of this paper, the selected of the main components finite elementof the bridge and parameter were studied. In the model of concrete filled steel tuberelated parameters by using the unified theory to select, and BEAM188unit to beused for simulation. With SHELL63plate shell element to simulate the roof and floorof the bridge, moreover, through the research, it is concluded that the BEAM188simulation longitudinal stiffening rib beam is scientific and reasonable.In the fourth part of this paper, based on the model of space plate shell-beamelement, it is studied that the displacements, stresses, and internal forces under selfgravity, double lane loading and large eccentric loads. Moreover according to thesituation of the analysis to give qualitative explanation, and make scientific datareferences for this type of bridge.In the fifth part of this paper, it is studied deeply on parameters of sensitive forthis type of bridge. And it is concluded that the reasonable parameter selectionprinciples and selection range, and provide the effective experience reference for thiskind of bridge design.