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Steel and Composite Structures
  Volume 7, Number 2, April 2007 , pages 119-133

Stability analysis of semi-rigid composite frames
Jing-Feng Wang and Guo-Qiang Li

    (Received June 27, 2006, Accepted March 9, 2007) Abstract. Based on stability theory of current rigid steel frames and using the three-column subassemblage model, the governing equations for determining the effective length factor (m-factor) of the columns in semi-rigid composite frames are derived. The effects of the nonlinear moment-rotation characteristics of beam-to-column connections and composite action of slab are considered. Furthermore, using a two-bay three-storey composite frame with semi-rigid connections as an example, the effects of the non-linear moment-rotation characteristics of connections and load value on the m-factor are numerically studied and the m-factors obtained by the proposed method and Baraket-Chen\'s method are compared with those obtained by the exact finite element method. It was found that the proposed method has good accuracy and can be used in stability analysis of semi-rigid composite frames.
Key Words
    effective length factor; semi-rigid connection; composite frame; moment-rotation characteristics.
Jing-Feng Wang; School of Civil Engineering, Tsinghua University, Beijing, 10084, People\'s Republic of China
Guo-Qiang Li; School of Civil Engineering, Tongji University, Shanghai, 200092, People\'s Republic of China
State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, People\'s Republic of China

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