Required Bracing Stiffness On Lateral Buckling
Strength For H-shaped Beams With Bracings
Author(s)
Y. Kimura & Y. Yoshino
Abstract
Lateral bracings are usually set to upper flanges of H-shaped beams in moment
resisting frames, and then the stress of the braced flange may become tensile. If
the bracings are connected to the tensile flange of H-shaped beams, its lateral
buckling strength is more increased than that without bracing. The bracing
connected to a tensile flange must restrain torsion to increase the lateral buckling
strength of the beams. In this paper, the elastic lateral buckling load of H-shaped
beams is developed with the energy method, and the relationship between the
lateral buckling load and bracing rigidity is clarified. Bracing rigidities are lateral
and rotational rigidities. The required bracing rigidity is suggested from two
equations of the elastic lateral buckling load. Next, large deformation analyses
are performed using ABAQUS with version 6.8, and the elasto-plastic lateral
buckling behaviour for H-shaped beams with lateral and rotational bracings is
presented. Also the buckling load is related with lateral and rotational bracings.
Finally, the lateral buckling load for H-shaped beams with the required bracing
rigidity is estimated with the modified equivalent slenderness ratio, and the
elasto-plastic buckling stress is compared with the buckling curve for the
Japanese standard code
Keywords: lateral buckling H-shaped beam, bracing stiffness.
Keywords
lateral buckling H-shaped beam, bracing stiffness
Related Book
Other papers in this volume
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