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     陳紹蕃*
    （西安建筑科技大學(xué)  710055）

[提要]  介紹輕型門式框架I形截面鋼構(gòu)件腹板的設(shè)計(jì)原則和方法。首先從防止受壓翼緣壓入腹板來分析腹板高厚比的最大限值，其次分別論述腹板受剪屈曲后的極限剪力計(jì)算、受彎或壓彎屈曲后有效寬度的確定，以及正應(yīng)力和剪應(yīng)力聯(lián)合作用下屈曲后相關(guān)關(guān)系的計(jì)算。
[關(guān)鍵詞]  腹板 寬厚比 屈趨后強(qiáng)度 拉力場(chǎng) 有效寬度

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