新型FRP-金属组合空间应急桥梁极限承载性能研究

Study on The Ultimate Load-carrying Capacity of A Novel Hybrid FRP-metal Space Emergency Bridge

轻型化应急桥梁在复杂地形条件下的抢险救灾任务中发挥出越来越重要的作用。将新型FRP-金属组合空间应急桥梁作为研究对象,采用ANSYS非线性静力分析的方法对其进行极限承载性能的研究。研究发现结构具有较高的承载能力,但是延性较差,致使铝合金接头受到破坏。采用减小斜腹杆截面尺寸的方法对结构的极限承载性能进行优化。在减小截面尺寸后的结构中,受压斜腹杆出现屈曲变形,结构可以在保持较高极限荷载的同时有较好的延性,斜腹杆的屈曲行为可为结构的最终破坏提供预警。此种方法可为同类型空间结构的优化设计提供理论依据。

Lightweight emergency bridges play an increasingly important role in rescue and disaster relief tasks under complex terrain conditions.Taking a novel hybrid FRP-metal space emergency bridge as the research object,and the ultimate load-carrying capacity is studied by ANSYS nonlinear static analysis method.It is found that the structure has a higher ultimate load,but the ductility is poor,and the ultimate failure mode is the failure of the aluminum joint.Then the method of reducing the cross-section of diagonal webs is used to optimize the ultimate load-carrying capacity of the structure.In the structure with reduced cross-section,buckling of the compressed diagonal webs appear.The structure can have great ductility while maintaining a higher ultimate load,and the buckling behavior of the diagonal webs can provide a prior-warning for the final failure of the structure.This method can provide a theoretical basis for the optimal design of the analogous type space structure.