圧縮材の挙動と補剛材の剛性・強度

Abstract

The purpose of this study is to present basic data for the design of a lateral bracing which supports the compression member at the center. In the study, elastic-plastic analyses of the compression member with initial deflection of one half wave were performed considering the transition of deflection mode from symmetry to asymmetry. The results obtained are summarized as follows: 1)In case the slendemess ratioλ>1.0 and the bracing stiffness is larger than the basic stiffness Kco, an asymmetric mode of the deflection appears at the maximum strength, and the magnitude of a bracing force is small and within 2% of the maximum load applied to the compression member. 2)In case λ>1.0, the necessary bracing stiffness to ensure that the carrying capacity reaches the target value and the bracing force is within 2% of the maximum strength is 1.4 Kco regardless of λ,. In case λ〓1.0, the necessary bracing stiffness increases as λ decreases, and it becomes 2.4Kco at λ,=0.2.