Study On External Prestressing Reinforcement Technology For T Shaped Rigid-Framed Bridge

Prestressed Concrete T-shaped rigid frame bridge is just emerging from the development of cantilever construction. It resolves prestressed concrete bridge construction problems and has a far-reaching impact to other bridge systems. But through the years, or 10 years of operation prestressed concrete bridge is found existing certain deficiencies in the use of performance, for example multi-deck joints, cantilever-deflection excessive and so on, these seriously reduce bearing capacity and actual useful life of the bridge, and influence communication safety. So it is a very urgent task to maintenance and reinforcement for these bridges. At present external prestressing technology is a excellent way to maintenance and reinforcement for completed structure, gradually applications together.This paper regard strengthening works of the Sudan Khartoum State Burri hinged T-shaped rigid frame bridge as an example, summary calculation theory and calculation method of external presstrssing technology reinforcement bridge, researching design scheme, construction scheme and theory problem of external presstrssing technology reinforcement big span bridge;Analysis use usage conditions and extreme conditions for external presstrssing reinforcement bridge;Discuss extreme stress of external presstrssing bar;Adopt finite element program ANSYS to analyze vibration characteristics of Burri bridge , Propose to avoid of structure resonates measure. This paper achievements provide beneficial reference for strengthening design and construction of big span T-shaped rigid frame bridge, which is very valuable for project practice.