对于失稳的情况，建立了用割线角估算失稳时间的一般公式。
At unstable state the formula of calculating unstable time using tangent Angle is established.
对于平面外稳定计算，考虑了平面外是有侧移失稳和无侧移失稳两种情况，分别给出了公式。
For the out-of-plane stability, design formulae are also proposed for sway buckling and non-sway buckling in the out-of-plane.
对于失稳的情况，建立了用割线角估算失稳时间的一般公式。
In the unstable circumstances, the general formula of calculating unstable time with tangent Angle is established.
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