一种轻型可展军用桥梁的设计与动力学分析

为保障人员迅速跨越沟渠、谷地等人工或天然障碍,研制了一种新型的轻型可展军用桥梁.该桥采用剪式铰和套筒可展机构实现轴向展开,用电机牵引主动索,展开至设计位置后锁定成工作状态.分析了预应力索和加劲桁架机构在减小桥梁变形、提高承载力方面的作用;制作缩比模型并进行了展开试验验证.研究结果表明:预应力索的设置使桥梁挠度从1/114减小到1/386,加劲桁架使桥梁承载力提高35.1%;该结构形式能稳定展开并投入使用,模型试验结果与展开的仿真结果吻合. 

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.