The Sytdy To Stress Regularities Of Distribution Of RPC Prestressed T-girder' Upper Plate

Reactive Powder Concrete (RPC) is a new kind of composite material,and has attracted much international attention,owing to its high mechanical properties such as high strength,high tenacity ,high durability ,low permeability and so on.In structures with prolonged service life and much better durability probability. Simply supported T-girders of pretressed concrete are characterized by simple structure,easy manufacture,transportation and maintenance,as well as relatively lower cost;accordingly,they are still the main types adopted in Rainway Line for Passenger Traffic and High Speed Railway under construction.This paper takes a new railway (20m span simply supported T-girder of prestressed RPC) under construction for example,a finite element model include.Verfy the structure design is appropriate.Addition,studies the upper plate stress distribution under three different work conditions.Gets the stress regularities of distribution vurses the loads: shear lag effect appear near the end of the beam and contain positive and negative shear lag effect. Addition,study the changing regulation of effective dispersion of distribution under differenct work contion: ffective dispersion of distribution increase vurse the increment of the distance form the end of the beam to the mid-span; the elementary beam is applianced for the design in the mid-span.The new railway under construction T-girder upper plate depth is 120mm . This paper creates different finite element model,of which the depths are 100mm,140mm,160mm.Caculates the effective dispersion of distribution under three work conditions.Gives the regularity of the effective dispersion of distribution vurses the depth of upper plate through contrast the result under the same work condition:the influence of plate's depth to the effective dispersion of distribution is litter.Provides reference for the future design.