EFFECT OF FORK RESTRAINT OF COLUMN ON LATERAL BUCKLING BEHAVIOR FOR H-SHAPED STEEL BEAMS WITH CONTINUOUS BRACES UNDER FLEXURAL MOMENT GRADIENT
Yoshihiro Kimura, Yui Sato, Atsushi Suzuki
Abstract
When a steel moment-resisting frame deforms horizontally, H-shaped beams are subjected to the flexural moment gradient. Generally, H-shaped beams are rigidly connected to the box section columns possessing the large fork restraint. Further, continuous braces on the top flange effectively prevent lateral buckling. In this paper, the lateral buckling behavior of continuously braced H-shaped beams with the fork restraint under the flexural moment gradient is clarified theoretically and analytically. Additionally, the elastoplastic buckling stresses of beams and lateral restraint force and rotational restraint moment of continuous braces are evaluated, reflecting the flexural moment gradient and constraint at the beam end.