Method for calculating track constraint reduction effect in ballastless track multi-span simply supported girder bridge

The invention discloses a method for calculating a track constraint reduction effect in a ballastless track multi-span simply supported girder bridge. The method comprises the following steps: acquiring parameter information of the ballastless track multi-span simply supported girder bridge; constructing a calculation model of the reduction effect in the bridge rail system; analyzing orbital constraint reduction effects under different spans; and analyzing the action rule of the track constraint reduction effect between different bridge spans, and completing the calculation of the track constraint reduction effect in the ballastless track multi-span simply supported girder bridge. According to the method for calculating the track constraint reduction effect in the ballastless track multi-span simply supported girder bridge, the change trend of the track constraint reduction effect can be quickly judged, and the influence rule of the rigidity of the lower structure of the bridge on the seismic response of the