- 【Title】Behavior of steel tube-reinforced concrete composite walls subjected to high axial force and cyclic
loading
- 【Abstract】This paper proposes an innovative composite shear wall, named the steel tube-reinforced concrete
(STRC) composite wall, with steel tubes embedded at the wall boundary elements and fully anchored within
the foundation. This arrangement is supposed to enhance the wall’s seismic performance. A series of
quasi-static tests were performed to examine the behavior of the ST-RC walls when subjected to high
axial forces and lateral cyclic loads. The area ratios of steel tube and of concrete filled steel tube
(CFST) (i.e. the ratios of the cross-sectional areas of steel tubes and of CFSTs over that of the wall
boundary element, respectively), axial force ratio, and cross-sectional shape of walls were taken as
major test variables. All specimens failed in a flexural mode, characterized by tensile yield of the
vertical rebars and steel tubes in the boundary elements and compressive crushing of concrete at the
wall bottom. The test results showed that the ST-RC composite walls had larger load-carrying and
deformation capacities relative to the RC wall counterpart. The deformation capacity of the
rectangular-shaped composite walls increased with an increase in the area ratios of steel tube and of
CFST and decreased with an increase in the applied axial force ratio. The barbell-shaped composite wall
that was configured with edge columns had much larger deformation and energy dissipation capacities than
the rectangular-shaped composite walls. In addition, simplified formulation was proposed to evaluate the
lateral load-carrying capacity of the ST-RC composite walls. The evaluated results showed good agreement
with the test results, with errors no more than 10%.
- 【Keywords】Steel tube-reinforced concrete (ST-RC); composite wall; Cyclic lateral loads; Seismic behavior;
Axial force ratio; Area ratios of steel tube and of CFST;
- 【Index】SCI: 907CK, Citation: 9
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