| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 84 === ABSTRACTThe success of a structural steel member to sustain
severe earthquake without collapsing depends on member''s
capability to undergo large inelastic deformation. It has been
shown that a compact wide-flange structural steel member can
still fail in local buckling mode. This study is concerned with
the post-buckling behavior of compact sections under general
three dimensional loading including bending, axial load and
torsion.In order to investigate the correlation among bending,
axial load and torsion, eighteen members from two structural
steel sections with various cross-sectional parameters were
tested under nine different combination of above-mentioned
loading. The bending capacity of tested members were compared
to distinguish the effects of torsion, axial load and their
combination in affecting a member''s bending performance. The
deterioration in energy dissipation after members locally
buckled is also compared and quantitatively evaluated.
Ductility of members under different combined loading is also
studied. It is found that both axial load and torsion have
significant effects in reducing a member''s bending capacity and
increasing its deterioration rate in energy dissipation after
member is locally buckled. It is also found that ductility of
members under combined loading is substantially reduced than
that of member subjected to bending only. The reduction in
ductility is more significant for members with larger depth/
width (d/b) ratio.
|
|---|
