When a beam flange is coped at the connection, the lateral buckling strength of the coped beam could be significantly less than that predicted by current formulas.

在切去梁翼后(简称切口)梁的侧向屈曲强度会比通常采用的设计理论所计算的强度大大降低。

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The purline is often designed as a simple beam, and only it′s strength needs to be calculated, if the roof panel can prevent it′s lateral buckling and torsion.

檩条一般采用简支梁，假定屋面板能阻止其侧向失稳和扭转，则只计算其强度。

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