有关的算法有根据定义的左右曲面角相等，法截面法和切向投影等。

The existing algorithms include equivalent left and right curve Angle by definition, normal section line method and tangent projection etc.

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并用改变构件局部截面尺寸法，对构件锈蚀引起的结构强度变化作了简单的探讨。

And the effect of corrosion on structural strength is discussed in brief by changing section thickness.

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设计中通常采用有效截面法。

Normally, it used effective section in designing.

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