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（國防科大指揮軍官基礎(chǔ)教育學院，長沙 410072）

［摘要］推導(dǎo)了豎向力對框架的抗側(cè)剛度影響系數(shù)α，并分別對計算側(cè)移框架二階效應(yīng)的P-Δ法、二階彈性分析法和雙二階效應(yīng)法的計算長

度系數(shù)進行修正。通過與《鋼結(jié)構(gòu)設(shè)計規(guī)范》(GB50017—2003)比較得知，雙二階效應(yīng)法計算長度系數(shù)取值比規(guī)范安全，修正后的P-Δ法和二階彈性分析法與規(guī)范最為接近，而二階彈性分析法和P-Δ法在梁柱線剛度比K₁大于1時偏于不安全。

［關(guān)鍵詞］抗側(cè)剛度影響系數(shù)；計算長度系數(shù)；二階效應(yīng)；梁柱線剛度比

Modified effective length coefficient of sway-frame considering vertical loads

Hu Qigao, Kong Weixue,Duan Jinxi,Xie Jianjun

（Military Basic Education College, National University of Defense Technology, Changsha 410072, China）

Abstract:The lateral stiffness factor α is deduced and used to modify the effective length coefficient which calculates sway frame′s second-order effect such as the P-Δmethod, second-order elastic analysis method and double second-order effect method. Through comparing with the  code for design of steel structure, it is showed that the double second-order effect method is beyond safe, the modified P-Δmethod and modified second-order elastic analysis method approximate to code, and the P-Δmethod and second-order elastic analysis method is not safe when beam-column′s linear stiffness ratio K₁ beyond 1.

Keywords:lateral stiffness factor; effective length coefficient; second-order effect; beamcolumn′s linear stiffness ratio