Analysis of Force Performance of PC Continuous Rigid Bridge with Curved in Vitro Prestressing Reinforcement
More and more bridges with the increase of the service life of the span deflection and cracks and other dis-eases,of which,the curve PC continuous rigid bridge is more serious,need to be strengthened design.In order to ac-curately reflect the current situation of the diseased bridges,a four damage condition model based on Midas/Civil is proposed,which determines the damage condition according to the deflection and is used as a computational model to analyse the causes of the disease.Three reinforcement schemes are proposed and modelled according to the number of extracorporeal cables bending down,and comparative analyses of flexural capacity,stresses at the top and bottom edg-es of the section and deflection before and after reinforcement are carried out according to the reinforcement ideas.The results show that the ultimate bearing capacity,structural stiffness and compressive stress reserve of the bridge are im-proved after the extracorporeal prestressing tensioning,and the deflection of the main girder is suppressed,which im-proves the structural linearity.
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