Required Rotational And Horizontal Stiffness Of
Lateral Support For H-shaped Compression
Members With Eccentric Braces
Author(s)
Y. Kimura
Abstract
This paper clarifies the flexural buckling load of H-shaped compression
members with lateral support at their half length and the required rigidity of the
lateral supports. In this study, the braces used as lateral supports are eccentrically
jointed to the compression members in their sections. The buckling load of the
members with eccentric support is calculated by the energy method and the
elastic eigen-value analysis, and then the braces are replaced by lateral and
rotational springs. This paper evaluates the rigidity demand equivalent to
immovable lateral supports and also confirms its effect using inelastic large
deformation analysis.
Keywords: H-shaped compression members, eccentric braces, energy method,
FEM, required rotational and horizontal stiffness.
1 Introduction
When the space structures are subjected to the seismic forces, their members
carry the large compression or tension stresses. In general, their compression
members are designed not to buckle by Allowable Stress Design, and they have
some braces which need some lateral stiffness to prevent buckling deformation
of compression members. The value of the required lateral stiffness is shown in
Japanese Design Standard for Steel Structure [1], but in the real structure, the
braces may not be jointed with the compression member into the center of its
section. The structural members in the truss frame are usually jointed with non-structural
members, which may be effective to prevent the flexural buckling of
the structural members subjected to compression load. But their joints are
eccentric, so the torsional bucking may occur with its flexural buckling of the
Keywords
H-shaped compression members, eccentric braces, energy method,
FEM, required rotational and horizontal stiffness.
Related Book
Other papers in this volume
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