Calculation Formula of Flexural Capacity of Normal Section of UHPC Railway Beams and Its Application

Research purposes: In order to give full play to the high tensile strength of UHPC and explore the reasonable inclusion of UHPC tensile strength in the design of railway UHPC beam flexural capacity, based on the existing railway bridge and culvert specifications, the calculation formulas of normal section flexural capacity of prestressed UHPC rectangular and T-section beams considering UHPC tensile strength are established. Compared with the test results of 27 groups of test beams, the feasibility of the calculation formula of flexural capacity is verified. Combined with the design example of 24 m span prestressed UHPC railway bridge, the flexural bearing capacity and safety factor of beam body considering UHPC tensile strength are compared and analyzed. Research conclusions:(1) Combined with the railway bridge design code system, the calculation formula of flexural capacity of railway UHPC bridge considering UHPC tensile strength is deduced. (2) Compared with the results of 27 groups of test beams, the calculation formula of flexural capacity in this paper is in good agreement with the test results, which can be used for engineering design. (3) Compared with the bearing capacity results without considering the tensile strength of UHPC, the ultimate bearing capacity of prestressed UHPC beams considering the tensile strength of UHPC in the tensile area can be increased by about 6%. When designing railway UHPC beams, considering the contribution of UHPC in the tensile area of the section can further optimize the section and save materials. (4) The research results have theoretical guiding significance for the design of railway UHPC beams. © 2022, Editorial Department of Journal of Railway Engineering Society. All right reserved.