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(1 同濟(jì)大學(xué)土木工程學(xué)院、土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室，上海 200092；2 山東大學(xué)土建與水利學(xué)院，濟(jì)南 250061；3 中國(guó)京冶工程技術(shù)有限公司，北京 100088)

［摘要］在現(xiàn)行鋼結(jié)構(gòu)設(shè)計(jì)規(guī)范的基礎(chǔ)上，結(jié)合無(wú)支撐純框架柱二階近似彈性分析的二階彎矩放大系數(shù)，提出了用于弱支撐框架柱考慮側(cè)移效應(yīng)的二階近似彎矩放大系數(shù)實(shí)用公式。實(shí)用公式充分考慮了柱端約束條件、作用于柱上的荷載、柱剛度以及長(zhǎng)細(xì)比等因素的影響，用于設(shè)計(jì)更加合理。

［關(guān)鍵詞］鋼結(jié)構(gòu)規(guī)范；弱支撐框架柱；二階效應(yīng)；彎矩放大系數(shù)；實(shí)用公式

Practical approach of magnification factor of moment considering  secondorder effect of steel frame column

Li Guoqiang1， Hou Hetao2， Hao Kunchao3

(1 School of Civil Eng.，State Key Laboratory for Disaster Reduction in  Civil Eng.,Tongji Uni., Shanghai 200092, China; 2 School of Civil Engineering, Shandong University, Jinan 250061, China; 3 China Jingye Engineering Corporation Limited，Beijing 100088, China)

Abstract:It presented a practical approach for calculating the approximate second-order elastic moment of the partially-braced frame column, based on the present design code of steel structures and the approximate magnification factor of second-order moment of unbraced frame column. This approach accounted for the end restraints of column, axial load applied on the column, flexural stiffness and slenderness. It was demonstrated that the proposed approach is reliable and valid.

Keywords:design codes of steel column; partially-braced frame column; second-order effect; magnification factor of moment; practical approach

*山東省優(yōu)秀中青年科學(xué)家科研獎(jiǎng)勵(lì)基金(2006BS10004)，沈陽(yáng)建筑大學(xué)省級(jí)重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金(JG200616)。

作者簡(jiǎn)介：李國(guó)強(qiáng)，教授，博士，Email: gqli@mail.#edu.cn。