Seismic Performance Analysis Of The Suspension Birdge Cable Tower Cross Tie Beam Ductility

At present, suspension bridge tower (including beam) seismic design andcalculation, generally do not consider the ductility of the member, but according to thestrength of the design and calculation. It often leads to a large cross-sectional dimensionof the tower (especially beams), and the reinforcement is very difficult. Therefore, forsuspension bridge Tower beams (general prestressed concrete) to carry out the analysisand calculation of the ductility of section, discussed the ductility seismic performance ofprestressed concrete beam.This paper special research on calculation and analysis for prestressed hollowrectangular section cross tie beam of suspension bridge, on the one hand, by thesoftware of OpenSees to analyse the force--displacement hysteresis curve of thesection, discusses the cross-section ratio of reinforcement, ordinary reinforcement ratio,the prestressed reinforcement ratio, prestressing degree and stirrup etc to the influencesof section curvature ductility; On the other hand by UCfyber sectional analysis softwarediscusses the influence of above factors as well as different forms of sections on thecurvature ductility performance of cross tie beam. Finally, through the calculationresults analysis of beam ductility, using the origin mapping software numerical fittingand analysis, Propose a simplified formula about Curvature ductility factor ofprestressed concrete beam section of Suspension bridge. the formula contains a totalreinforcement ratio, prestressed reinforced, concrete strength and other factors. Throughtwo real bridge application shows that in this paper, beams curvature ductility factorsimplified formula has better practicability.