Study on mechanical effect of adjacent vertical prestressed tendons

The web cracking of continuous rigid frame bridge is still a common phenomenon. A part of the reason is that the vertical prestress does not work well. At present, the mechanical research of vertical prestressed reinforcement is not comprehensive, the mechanical effect between two adjacent vertical prestressed tendons is not thorough, theoretical analysis cannot be carried out through formula derivation, and finite element modeling is relatively dependent on, so the work is cumbersome and the application is not convenient. In view of this problem, this paper uses elastic mechanics theory to deduce the stress effect formula of two adjacent vertical prestressed tendons, and verifies the correctness of the formula through finite element modeling. In addition, this paper also uses the finite element theory to carry on the modeling calculation, obtains the distribution law of the web stress caused by the vertical prestress along the height of the web and the longitudinal direction of the box girder, providing guidance for the vertical prestressed design of rigid frame bridge.