In this paper, the experiment of the full scale specimen and the nonlinear FEM analysis have been conducted to obtain the behavior of H-shaped beam connected by the flush end plates which fall into the connection failures or the lateral buckling. As a result, the intensities of restraint of the beam ends are reduced by the end plates deformation, and then the lateral buckling strengths of the beams are reduced by the deformation. We present the prediction methods of the lateral buckling strength of the beam influenced by the out of plane deformation of the flush end plates.

This paper presents boundary conditions for lateral buckling of the H-shaped beams connected to columns by flush end plates which fall into the lateral buckling following the out of plane plastic deformations of the flush end plates. The study is conducted by the following procedure: First, the behavior of the connection is researched by the no buckling experiment under the cyclic loading. As a result, it is found that the relationship between the out of plane plastic deformations of the endplates and the bending moment at the beam end can be predicted. Next, the FEM analyses of the rigid-frame structures consist of the slender beams having flush end plates connection and the structures consist of the beams having rigid connection are conducted to research the stress conditions in the tension flanges and the compression flanges of the beams during falling into lateral buckling. As a result, it is found that the rigid connection is restraining warping of the beam more tightly than the flush end plates connection, then the maximum bending moment strength against lateral buckling of the beams connected by rigid connections is higher than those of the beams connected by flush endplate. We recommend that the boundary conditions for the lateral buckling of the beams connected by flush end plates should be regarded to be different from those of the beams connected by the rigid connections.

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