The reason may be that vertical rigidity is usually dismissed as small rigidity values of longitudinal connecting bars count little in the vertical plane.
因为结构纵向联系构件在竖向平面的刚度很小，一般情况下忽略不计。
Encountering a vertical gust environment the plane will get unexpectful longitudinal load.
飞机受到垂直阵风的影响会产生不希望的法向过载。
Encountering a vertical gust environment the plane will get unexpectful longitudinal load.
飞机受到垂直阵风的影响会产生不希望的法向过载。
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