In the mid-column design of gabled frames, the selected solid web section, isn t satisfied by in-plane stability checking because of the biggish out-plane effective length.

门式刚架的中柱设计中，常因为平面外计算长度较大，所选实腹式截面无法满足平面外稳定验算，从而导致用钢量增加。

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We first introduce the background of the effective length of bent column of the code, and point out the exist problems.

首先介绍了我国规范中的排架柱的计算长度的历史背景，并指出其中存在的问题。

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The evaluation of column effective length factor both braced frames and unbraced frames with flexible joints is derived.

按此方程导出了无侧移框架和有侧移框架柱的计算长度取值方法。

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