Abstract
In traditional building construction, the structural columns restrict the design of the buildings and the layout of furniture, so the use of specially shaped columns came into being. The finite element model of a reinforced concrete framework using specially shaped columns was established by using the ABAQUS software. The effects of concrete strength, reinforcement ratio, and axial compression ratio on the seismic performance of the building incorporating such columns were studied. The numerical analysis was performed for a ten‐frame structure with specially shaped columns under low reversed cyclic loading. The load‐displacement curve, peak load, ductility coefficient, energy dissipation capacity, and stiffness degradation curve of the specially shaped column frame were obtained using the ABAQUS finite element software. The following three results were obtained from the investigation: First, when the strength of concrete in the specially shaped column frame structure was increased, the peak load increased, while the ductility and energy dissipation capacity weakened, which accelerated the stiffness degradation of the structure. Second, when the reinforcement ratio was increased in the specially shaped column frame structure, the peak load increased and the ductility and energy dissipation capacity also increased, which increased the stiffness of the structure. Third, when the axial compression ratio was increased in the structure, the peak load increased, while ductility and energy dissipation capacity reduced, which accelerated the degradation of structural stiffness.
Highlights
With the increasingly improved living quality in China, popular expectation for improvements in the quality of buildings has increased
Numerical simulation analysis was performed on a tenframe structure with specially shaped columns under low reversed cyclic loading, according to which the following conclusions were drawn: (1) In reinforced concrete frame structures with shaped columns, with an increase in the strength of concrete, the peak load gradually increased, presenting arced hysteresis curves
Energy dissipation capacity and deformation capacity were gradually decreased, and there was an increase of 15–20% over the initial stiffness value. e stiffness degradation curves of frames with smaller concrete strengths were flatter, with a longer descent stage, and they exhibited better seismic performance
Summary
With the increasingly improved living quality in China, popular expectation for improvements in the quality of buildings has increased. Numerical models of reinforced concrete frame structures with specially shaped columns were established using the ABAQUS FE software, based on which the influential relationships were obtained between concrete strength, reinforcement ratio, and axial compression ratio on their seismic performance [12,13,14,15]. In order to verify the validity of the model, a simplified mechanical model was established in ABAQUS according to the test results in the reference literature and boundary conditions and corresponding loading methods were used to restrict the bottom of the shaped columns to six degrees of freedom.
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