bridge engineering;  anchor spray;  principal stress;  Frequency

Based on the finite element theory, with the help of the general calculation program ANSYS, a finite element model was established for a solid bridge, and the changes of deflection, stress, self-resonance frequency and mode shape characteristics of the bridge under different load conditions were analyzed based on the detection results, and the static and dynamic characteristics of the bridge structure before and after reinforcement were studied. The results show that the anchor sprayed concrete reinforcement of the small hinged slab bridge effectively reduces the stress and strain of the section of the plate girder and improves the self-resonance frequency of the bridge structure. It can be seen that the reinforcement of anchor sprayed concrete can improve the overall rigidity of the structure, enhance the bending and torsion resistance of the structure, and improve the overall force characteristics of the bridge, which has high promotion and application value.