Method for determining reinforcement constraint position of catenary arch bridge cable structure system

The invention discloses a method for determining a reinforcement constraint position of a catenary arch bridge cable structure system, which comprises the following steps of: symmetrically arranging cables on two sides of a catenary arch bridge to reinforce the catenary arch bridge; one end of the cable is parallel to the top end of the catenary arch bridge and fixed on the bridge abutment, and the cable constraint position at the other end is determined through analysis; the method comprises the following steps: collecting, actually measuring or setting values of parameter rise span ratio gamma, arch axis coefficient m and axial rigidity ratio t of a catenary arch bridge to be reinforced, and setting values of different cable constraint positions xi1; under the effect of the lane load, an arch bending moment envelope diagram is obtained; drawing and analyzing the internal force ratio of the arch crown, the arch springing and the L/4 section (L is the span of the arch) of the cable-catenary arch and a change