Analysis of Mechanical Property of Steel-Concrete Joint Section in Partially-Earth-Anchored Cable-Stayed Bridge
With a main span of 760 m,the Danjiangkou Reservoir Bridge is a two-pylon,hybrid girder cable-stayed bridge,featuring the pairs of earth-anchored stay cables.The two steel-concrete joint sections in the superstructure,each measuring 6 m in total length and consisting of rear bearing plates,a latticed steel chamber and prestressing tendons,are located within the main span,20 m to the centerlines of the two pylons.The steel-concrete joint section was numerically simulated in ANSYS,to verify the effectiveness of the structural design and figure out the load bearing behavior and load transfer characteristics of these specific locations.The load bearing conditions of the primary load transfer components under the most unfavorable axial load combinations in ultimate limit state,including the steel beams,bearing plate,in-fill concrete in the steel chamber,and PBL connectors,were analyzed,and the load-transfer sharing portions of these primary components were calculated.The results demonstrate that the steel-concrete joint section is in uniform stress distribution state,with required load bearing indexes for each component.The steel-concrete joint section displays even rigidity transition and smooth load transfer,effectively preventing the occurrence of stress concentration triggered by abrupt rigidity change.The shear connectors in the edge cells of the steel-concrete joint section play a dominant role in shear force transfer,as the relative slips between the in-fill concrete and PBL connectors accumulate,the shear forces of the PBL connectors gradually increase.The axial ratio of the pressure transfer of bearing plates roughly equates the axial ratio of the shear force transfer of the latticed chamber.The pressure transfer of bearing plates collaborate with the shear force transfer of the latticed steel chamber,leading to the improved load bearing capacity of the steel-concrete joint section.
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