[FEM][SteelStructures] 有侧移与无侧移框架的屈曲模态 (Buckling Modes of Frames with and without Sidesway)

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实干、实践、积累、思考、创新。

有侧移框架及无侧移框架是钢结构中常用的概念，有侧移及无侧移框架构件的计算长度取值不同。

有侧移框架柱，计算长度系数大于1.0，而无侧移框架柱计算长度系数在0.5~1.0之间，为啥 😆 ，仔细想想，其实从屈曲模态也可以看出来。

有侧移及无侧移框架的屈曲模态差别，有侧移框架失稳为反对称失稳，构件为双曲率屈曲，无侧移框架失稳为对称失稳，构件为单曲率屈曲。。。

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