No bonding;  prestress;  road bridges;  Finite element method

There are 2 ways to apply prestress in the general finite element analysis software ANSYS: discrete and monolithic. In this paper, two methods for establishing finite element models are discussed in detail for the monolithic formula: the solid segmentation method and the independent modeling coupling method. Finally, for the unbonded concrete beams of the superstructure of Wangcun II Bridge of Line X2 in Pingdingshan City, a finite element model is established by applying the integral prestress and independent modeling coupling method to analyze the whole process of stress. Combined with the measured data, the calculated load-deflection curve, cross-sectional strain and concrete stress are compared, and the error can be seen to be within 017%, which verifies the feasibility and applicability of the proposed method.