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Volume 4
International Conference on
CIVIL & STRUCTURAL ENGINEERING
June 21-22, 2018 Paris, France
Journal of Steel Structural and Construction
ISSN : 2472-0437
Civil Engineering 2018
June 21-22, 2018
Synthesis and shape memory study of amino acid-based polyurethane
Jiang Yuanzhang and HU Jinlian
The Hong Kong Polytechnic University, China
T
his paper deals with the hysteretic behavior, analysis and stability evaluation of thin-walled steel tubular columns subjected to
cyclic multiaxial (axial and bidirectional lateral) loading. Steel columns are very useful in highway bridge pier construction as
it offers flexible space requirement and provides speedy construction. Behavior of steel columns under earthquake-induced loads
is rather complicated as earthquakes occur in an oblique direction. However, modern seismic design philosophies have been based
on the behavior of structures under independent actions of uni-directional loading in orthogonal directions. In this study, inelastic
cyclic behavior of steel columns subjected to axial force together with simultaneous bi-directional cyclic lateral loads is investigated
using an advanced finite element analyses procedure. Several types of linear and non-linear idealized loading patterns are employed
to check the strength and ductility. The effects of important structural parameters and loading history on the behavior of thin-walled
steel tubular columns are examined using the proposed procedure. The obtained results from this study confirm the importance of
considering behavior of steel columns under multiaxial loading. The multiaxial tests and finite element analysis results showed
that the behavior of a tubular column under multiaxial loading becomes complex and exhibits a circular trajectory once local
buckling occurs. The local buckling bulge in the multiaxial loading case tends to develop monotonically due to the circular trajectory.
As a result, the residual deformation becomes larger. On the contrary, the unidirectional loading test and analysis are likely to
underestimate the damage and the residual displacements caused by an earthquake. It is concluded that the effects of multiaxial
loading should be considered in ductility evaluation and seismic resistance design of steel structures.
iraj.mamaghani@engr.und.eduJ Steel Struct Constr 2018, Volume 4
DOI: 10.4172/2472-0437-C1-007