A beam-column finite element model composed of several fiber segments is proposed to predict the large deflection behavior of spatial rigid frames. The basic equations are developed on the basis of the beam-column finite element method using the incremental perturbation technique. In this paper, the elasto-plastic lateral buckling behavior of H-shaped beams is analyzed. The results of analysis predict with accuracy the moment-displacement relationship obtained from experiments. The magnitude of torque adopted as imperfection influences the strength. The residual stress sensitively affects on the strength and deteriorating behavior. On the other hand, the shear modulus in plastic range does not affect.
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