Pc Bend Of High Pier Span Continuous Rigid Frame Bridge Simulation Analysis

Based on the western communication construction scientific and technical item, 'The design and construction technology study of the long span curved bridge with high pier", the change rule of the sheer lag of the thin-walled box beam , the transverse deformation and the torque of the structure is analyzed by using finite element theory in this paper . The affection to structure by different arrangement of prestressed tendons and the change rule of the internal force and deformation of structure with different radius are also discussed .And in this paper , the differences of the beam element and the real effects of three dimension is also compared and analyzed . The influencing rule of the internal force and deformation by prestress is got, the suggestion to the arrangement of prestressed tendons and the constitution of similar structure is also brought out.The results shows that the sheer lag of the box beam is aggravated after the application of prestress .But the box beam cross section is under action of compression stress for the presstress , the reservation of compression stress is huge , which is good to structure .So it shows that the real stress of the structure can not be described by using beam element .The arrangement of prestressed tendons should especially be cared in bridge design for huge affection to structure .The previously deformation should be made in construction of pier for the opposite deformation by prestress to dead load . The value of principle stress of box beam web can be greatly reduced by the arrangement of down-curved prestressed tendons , and the value of structure torsion also can be shut down by presstress .For the different curvature bridge ,the affection to the torsion , the transverse deformation and the difference of stress of outer and inner of the structure becomes greater by the prestress when the radius gets smaller.The results of the paper gives some experiences and advises to the design and construction of the similar long span PC curved continuous rigid frame bridge.