The project design for repairing and strengthening of the reinforced concrete beam of the Yaan bridge;

From five aspects: less antidumping factors,unfitting formwork supports,setting of main steel bar,construction overloads and form removal too early reasons caused the collapse of cantilevered structure are analyzed;at the same time corresponding prevention measures are proposed in order to avoid structural accidents of cantilevered structure.

Taking Xixin Bridge,the longest span reinforced concrete girder self-anchored suspension bridge,as the background,this paper introduces the construction control to simulate the construction processes of the bridge.