A Simplified Method For The Segmental Prestressed RUHPC Down Through Truss Girder Bridge

Advances in materials technology promote the development of bridge technology,the application and development of long-span bridges require the materials to have characteristics of lightweight, high strength, long-term stability and durability under complex environment.UHPC has excellent mechanics performance and durability. So the construction of long-span bridges with UHPC can realize the structure of lightweight, high strength and durability.And truss bridge can exert the properties of UHPC and greatly reduce the weight of structure. So bearing UHPC segmental prestressed truss girder bridge has prominent advantages and wild application prospect.But the mechanical properties of the basic components of the truss girder bridge mentioned just now is not completely clear.There is only very limited research work.Based on the theoretical and nonlinear finite element analysis, this paper carried out the mechanical properties analysis of RUHPC axial tension members, RUHPC axial compression members and prestressed RUHPC eccentric tension members.And according to RUHPC axial tension members this paper established cracking load and ultimate bearing capacity calculation method.At the same time this paper also established steel bar yield and ultimate bearing capacity calculation method of RUHPC axial compression members and cracking load and ultimate bearing capacity calculation method of prestressed RUHPC eccentric tension members.The finite element modal was verified by approximate structure experiment. And based on this finite element modal, this paper analyze the influence of eccentricity, sectional dimension and ratio of reinforcement on equivalent tensile stress coefficient of ultimate load of prestressed RUHPC eccentric tension members.According to the static performance of structure, this paper put forward the practical design method of bearing UHPC segmental prestressed truss girder bridge.And based on this design method, a typical truss pedestrian bridge and a pipeline bridge were designed.Compared with the ordinary concrete and steel, this paper explored the feasibility and advantages of UHPC materials that was used in the bearing truss girder bridge.