Reinforcement Principle and Application of Steel Truss for Continuous Rigid Frame Bridge
Due to the shortcomings of traditional reinforcement methods and the damages of prestressed continuous rigid frame bridge,a new reinforcement method is proposed that steel upper chord and web are added to the original structure,and the original prestressed concrete structure is used as the lower chord to form a squat structure to resist partial load.The method is to add a steel structure,and part of the load originally undertaken by the concrete structure is transferred to the concrete structure,so as to achieve the purpose of improving the structural bending and shearing capacity and structural stiffness with less cost.This paper takes the reinforcement of Xiangjiangyu Yujiang Bridge as an example,elaborates the method and its mechanics,and carries out detailed reinforcement design.In addition,it can be seen from the comparative analysis of the finite element method that the method can effectively improve the mechanical properties such as rigidity,strength and dynamic characteristics of the structure under the premise of increasing the amount of steel used,and the construction is convenient,so it is suitable for both the loading and reinforcement of continuous rigid frame bridges.
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