Lateral buckling is one of collapse modes of H-shaped beams and the effects of boundary conditions and end moment ratio on lateral buckling mode have not been clari�ed yet. The purpose of this paper is to propose new factors for evaluating lateral buckling strength.These factors are relevant to each conceivable condition based on elastic lateral buckling analysis in which boundary conditions and end moment ratio are considered. Also, in this paper the adaptation validity of these factors is mentioned through reviewing and comparing the previous studies subjected to evaluation of lateral buckling strength.�
In a recent study , it was clear that the beam with large web slenderness has enough plastic deformation capacity for seismic design . But the large deformation behavior and the collapse mechanism of these beams have not been cleared 、 In this study , the collapse mode and that deciding the maximum load are investigated by exper 至 ment study and numerical analysjs , As a results , it is clear that the ratlo of the shear strength to bending strength of the beam is very important factor for the plastic deformation behavior . And the plastic deformation capacity of the beam is estimated by using the ratio .
In the past, it was shown that H-shaped beams with large depth-thickness ratio are useful as a seismic design beam. But, under cyclic loading, the characteristics of these beams have not been examined enough. So in this study, the cyclic behavior, plastic deformation capacity and energy absorption ability of H-shaped beams having larger depth-thickness ratio than the limit of current standard are examined by cyclic experiments and numerical analysis. And the new limit value of plate slenderness are proposed. The plate local postbuckling behaviors of these beams are considered and modeled for progressive use in the future.
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