而现行冷弯型钢设计规范GB 50018 - 2002采用有效截面法计算受弯构件的屈曲荷载并没有考虑卷边角度的影响，不能合理的进行斜卷边Z型檩条的屈曲荷载设计。

But the current specification GB50018-2002 does not consider the effect of lip inclination, hence, it cannot be effectively used in designing inclined lipped Z-section purlins.

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我们必须把垫子的边角粘住才能使它不卷。

We must glue the mat down at the edges to stop it curling.

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