Design and Dynamical Analysis of New Light Deployable Bridge

To rapidly across ditches, valleys and other artificial or natural barriers for personnel, a new light deployable military bridge was developed. Scissors and sleeves are adopted to realize the axial deployment. A motor is used to drove a main cable to expand the bridge until it reaches a designed location, and then the bridge is locked. The functions in reducing deformation and enhancing bearing capacity were analyzed for the prestressed cable and brackets. A reduced-scale model for this bridge was made, and the test validation was carried out. The research results show that bridge deflection decreases from 1/114 to 1/386 because of setting the prestressed cable, and the bearing capacity increases by 35.1% due to the brackets. The structure can be successfully deployed and put into use, and the test result is in good agreement with the simulation one.