陈绍蕃*
    （西安建筑科技大学  710055）

[提要]  介绍轻型门式框架I形截面钢构件腹板的设计原则和方法。首先从防止受压翼缘压入腹板来分析腹板高厚比的最大限值，其次分别论述腹板受剪屈曲后的极限剪力计算、受弯或压弯屈曲后有效宽度的确定，以及正应力和剪应力联合作用下屈曲后相关关系的计算。
[关键词]  腹板 宽厚比 屈趋后强度 拉力场 有效宽度

Design principle and procedure of web plate inⅠ-section Members of light steel portal frames are given in this article. Maximum width-thickness ratio of web plates to prevent the compression flange from buckling into the web is first discussed. Afterwards, post-buckling strength of webs subject to shear and normal stresses separately or simultaneously are treated.
Keywords: web plate; width一thickness ratio; post-buckling strength;tension-field; effective width