鉄骨充腹ばりの横座屈に関する研究(その1)

Abstract

Lateral buckling tests of wide flange beams were performed in the inelastic range of material.Test specimens were made of H-200 x 100 x 5.5 x 8 of SS4l steel. All specimens consisted of threespans and were braced laterally at loading points and supporting points. Twelve specimens weretested; four testing span lengths and three end-moment ratios. As a result of the tests, it wasconfirmed that the rotation capacity at a plastic hinge became larger as the bracing spacing wasshorter, and as the moment gradient was larger. The tests results agreed, with a reasonableaccuracy, in the relationship between the rotation capacity and the bracing spacing with theformulae given by M.G. Lay')'2~. The lateral force exerted by the bracings was about 1.6% ofthe limit force of one flange in pure compression at the time of lateral buckling, and the lateral forcewas measured up to about 4.1% at maximum.