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Steel and Composite Structures
  Volume 24, Number 4, July20 2017 , pages 409-423

Research on damage of solid-web steel reinforced concrete T-shaped columns subjected to various loadings
Jianyang Xue, Chaofeng Zhou and Zuqiang Liu

    This paper presents an experimental study on damage evolution laws of solid-web steel reinforced concrete (SRC) T-shaped columns along the direction of the web under various loadings. Ten specimens with a scale ratio of 1/2 and a shear span ratio of 2.5 were designed and fabricated. The influences of various parameters, including the axial compression ratio, steel ratio, and loading mode, were examined. The mechanical performances including load-displacement curve and energy dissipation capacity under the monotonic and low cyclic loadings were analyzed. Compared with the monotonic loading, bearing capacity, ultimate deformation capacity, and energy dissipation capacity of the specimens decrease to some extent with the increase of the displacement amplitude and the number of loading cycle. The results show that the damage process of the SRC T-shaped column can be divided into five stages, namely non-damage, slight-damage, steadily-developing-damage, severedamage and complete-damage. Finally, based on the Park-Ang model, a modified nonlinear damage model which combines the maximum deformation with hysteretic energy dissipation is proposed by taking into account the dynamic influence of the aforementioned parameters. The results show that the modified model in this paper is more accurate than Park-Ang model and can better describe the damage evolution of SRC T-shaped columns.
Key Words
    steel reinforced concrete (SRC); T-shaped column; damage evolution; damage model; experimental study; various loadings
College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, China.

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