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Y形柱是机场航站楼屋盖支承体系中常采用的一种构件形式,作为主要承重构件,其稳定性决定了屋盖结构的整体承载能力。利用荷载-位移全过程跟踪技术,考虑几何非线性、材料非线性和初始几何缺陷,研究了在竖向和水平风、地震作用下薄壁Y形柱的稳定性。研究表明:竖向荷载作用下Y形柱以分叉段平面外屈曲为主要失稳模式;Y形柱对初始几何缺陷不敏感;水平风荷载对Y形柱稳定性不起控制作用;竖向和水平荷载作用下,发生面外失稳前柱子分叉处已经进入塑性变形,柱子强度问题先于整体失稳。
Y-shaped column is commonly used in the roof terminal support system of the airport terminal form, as the main load-bearing components, the stability of the roof structure determines the overall carrying capacity. The stability of thin-walled Y-shaped columns under vertical and horizontal winds and earthquakes is studied by using the whole process of load-displacement tracking technology, considering geometric nonlinearity, material nonlinearity and initial geometric defects. The results show that the Y-shaped column under the vertical load has the buckling section in plane buckling as the main destabilization mode; the Y-shaped column is insensitive to the initial geometric defects; the horizontal wind load can not control the stability of the Y-shaped column; And the horizontal load, the column bifurcation has entered the plastic deformation before the occurrence of out-of-plane buckling, and the column strength problem is prior to the overall instability.