初始几何缺陷对大跨度钢桁架吊装稳定性影响

摘要

This paper establishes finite element mode for large-span steel truss hoisting process with large-scale common finite element software ANSYS,and studies the impacts of initial imperfections on the stability of large-span steel truss hoisting.Results show that in the two hoisting point scheme,bucking is easy to happen at mid-span top chord,mid-span mid-low chord is easy to lose stability in the hoisting process for four hoisting point scheme.%利用大型通用有限元软件ANSYS对大跨度钢桁架吊装过程建立了有限元模型,研究了初始几何缺陷对大跨度钢桁架吊装的稳定性影响。结果表明,在两吊点方案中容易发生屈曲的位置为跨中上弦杆部分,而四吊点方案在吊装过程中跨中下弦杆部分较易发生平面外失稳。