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張文元 王忠麗 張耀春
(哈爾濱工業(yè)大學(xué)土木工程學(xué)院 150090)[提要] 用ANSYS有限元程序，考慮幾何非線性，對等截面斜腿剛架進(jìn)行了大量的荷載-位移全過程分析。分析中考慮了柱傾斜角度、柱高度與跨度比和梁的起拱坡度等參數(shù)，以及梁上均布荷載和集中力兩種加載形式，最后給出了斜腿剛架的各種失穩(wěn)模式和相應(yīng)剛架柱的計(jì)算長度系數(shù)，供設(shè)計(jì)時(shí)參考。二階彈塑性算例分析表明，在利用有效長度法進(jìn)行斜腿剛架平面內(nèi)整體穩(wěn)定性驗(yàn)算時(shí)，除剛架柱外，還要驗(yàn)算梁的穩(wěn)定性。
[關(guān)鍵詞] 斜腿剛架 整體穩(wěn)定性 計(jì)算長度系數(shù)In-plane Global Stability of Tilted Column Portal Frame with Prismatic MembersZhang Wenyuan, Wang Zhongli, Zhang Yaochun(School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China)Abstract: Using the finite element program of ANSYS and considering elastical and geometrical nonlinear bebavior, the load- displacement curves for lots of tilted column portalframes with prismatic members are obtained. The parameters such as column tilting angle, ratio of frame height to its span and gradient of beams are considered in the course of portal frame analysis under uniformly distributed loads or concentrated loads.Finally, different buckling modes of tilted column portal frames and corresponding effective length factors are proposed, which may be useful for design. Results of the elastic-plastic second order analysis for the portal frame with tilted columns indicate that the beam stability checking must be included in the calculation of stability using the effective length method.
Keywords: titled column portal frame; global stability; effective length factor
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