Cable-catenary arch bridge reinforcing method based on spandrel filler load adjustment

The invention discloses a cable-catenary arch bridge reinforcing method based on spandrel filler load adjustment, which comprises the following steps: firstly, calculating to obtain a catenary arch axis equation of the cable-catenary arch bridge, and then calculating and fitting the arch axis equation according to the basic principle of a force method to obtain a Xi0 standardized fitting formula; during use, structural parameters of a cable-arch bridge to be reinforced and a cable to be used are collected or actually measured and then substituted into the standardized fitting formula, and the position of a point representing that the cable force variation is zero can be obtained through calculation. And finally, the dead load internal force is adjusted at the position by replacing arch filler or adopting a large-porosity material method, and the effect of reinforcing the cable-arch bridge is finally achieved. The method can be widely applied to reinforcement engineering of various cable-catenary arch bridges,