Model Test Study On The Bearing Characteristics Of Composite Frame Bridge In Mining Subsidence Area

On the basis of physical simulation experiment and numerical simulation, thispaper takes the composite frame bridge in some mining subsidence area as theprototype, builds the mechanical model of composite frame bridge and mainly studiesthe load transfer mechanism of composite frame bridge under the different case oftilted foundation sinking and vertical load, the inclination deformation relationshipbetween composite frame bridge and earth surface, and the reasonable combinationform of composite frame bridge that we can use in mining subsidence.Through model experiment, we study the variation of the upper and lowerculvert’s additional stress, and study the inclination deformation of composite framebridge’s upper structure in mining subsidence, under the different cases of foundationinclination deformation and vertical load. The results show: When the vertical loadchanges within a certain range, it can improve the bearing capacity of compositeframe bridge with the increase of foundation inclination deformation’s slope, and it isfavorable to the composite frame bridge’s structure itself; When the foundationinclination deformation changes within a certain range, it will make the compositeframe bridge faster to reach the limit state of bearing capacity with the increase ofload, and it is unfavorable to the composite frame bridge’s structure itself; When thefoundation inclination deformation is≤5‰, the inclination deformation of compositeframe bridge and foundation surface is close, but the foundation surface’s inclinationdeformation becomes bigger than inclination deformation of composite frame bridge’supper culvert with the gradually increase of foundation surface’s inclinationdeformation, and the relationship between them is linear.Based on the finite element analysis software ANSYS, we build the framebridge’s numerical model of different combination form under the condition ofmining subsidence area, and comparatively analyze the additional stress anddeformation law of frame bridge in different combination forms under the differentcases of foundation inclination deformation and vertical load. The research resultsshow: Compared with only using the friction effect, the composite frame bridge usinganchorage will have a better ability to bear loads and resist deformation, which willlay a good foundation for the management of frame bridge in mining subsidence area.