Research on the Layout Plan of Steel Tendons for Block 0 of Prestressed Concrete Low Tower Cable-stayed Bridge
The main bridge of Qujiang super major bridge on Chengdu-Dazhou-Wanzhou High-Speed Railway is a(139+278+139)m prestressed concrete low pylon cable-stayed bridge.Block 0 is the consolidation of pier,tower and beam.The structure of consolidation area,layout of prestressed tendons and stress state are very complex.In order to explore the stress level and state of the consolidation area of the pier,tower and beam,and verify the rationality and compliance of the layout of prestressed tendons in this area,based on the static Equivalence principle,the element internal force of the overall calculation model of the whole bridge is first extracted,and the local calculation model of block 0 is established by using the finite element analysis software,and then the element internal force of the overall calculation model of the whole bridge is converted to the overall coordinate system and applied to the finite element model,Finally,refined calculation and analysis were conducted on the main force and main force+additional force of block 0 under various working conditions,and two steel tendon arrangement schemes,including vertical prestressed steel tendons within the range of tower columns,were calculated,analyzed,and compared.The calculation results show that after arranging vertical prestressed steel tendons within the range of the tower column,the main tensile stress at the root of the tower column is reduced from 2.41 MPa to 0.76 MPa,and the stress distribution of the tower column is also significantly improved.The working stress is more reasonable,and it also verifies the rationality of the longitudinal and transverse prestressed steel tendon settings of block 0.This provides a theoretical basis for the longitudinal,transverse,and vertical prestressed steel tendon layout of block 0 of the bridge.
high-speed railwaylow tower cable-stayed bridgepier tower beam consolidation0#blockfinite element analysis
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